* [B.A.T.M.A.N.] [batman-adv] Does batman-adv works perfectly?
@ 2017-04-06 2:32 Xuebing Wang
2017-04-06 7:04 ` Simon Wunderlich
2017-04-06 7:10 ` Sven Eckelmann
0 siblings, 2 replies; 13+ messages in thread
From: Xuebing Wang @ 2017-04-06 2:32 UTC (permalink / raw)
To: b.a.t.m.a.n
Hi community,
We have batman-adv working on OpenWRT Chaos Calmer.
- Atheros ar9331 MIPS platform + built-in ath9k WiFi
- batman-adv version 2016.1
- routing_algos = BATMAN_IV
- Wireless interface MTU = 1532, adhoc network encryption "psk2-ccmp"
- bat0 interface MTU = 1500
We have batman-adv running on 10+ sites. For each site, there are 10-20
nodes in the mesh network.
batman-adv runs almost perfectly (*almost*). Occasionally (occurrence
rate is low), node drops off the batman-adv / adhoc mesh.
- Sometimes, node can recover (re-joins the mesh network automatically),
but not always.
Any suggestions? Does batman-adv works perfectly in the field (i.e.
running for 1 year with 100+ nodes without any issues)?
What about I use one node as Master, and other nodes ping this Master
every 10s (or 30 seconds) (to keep mesh from inactivity)? Does this help?
Thanks.
Xuebing Wang
^ permalink raw reply [flat|nested] 13+ messages in thread
* Re: [B.A.T.M.A.N.] [batman-adv] Does batman-adv works perfectly?
2017-04-06 2:32 [B.A.T.M.A.N.] [batman-adv] Does batman-adv works perfectly? Xuebing Wang
@ 2017-04-06 7:04 ` Simon Wunderlich
2017-04-06 7:13 ` Sven Eckelmann
2017-04-22 7:12 ` Xuebing Wang
2017-04-06 7:10 ` Sven Eckelmann
1 sibling, 2 replies; 13+ messages in thread
From: Simon Wunderlich @ 2017-04-06 7:04 UTC (permalink / raw)
To: b.a.t.m.a.n; +Cc: Xuebing Wang
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Hello Xuebing,
it sounds like you have WiFi driver issues. There are some effects like key
cache corruption, deafness, and other effects known for the AR93xx series. To
confirm, you can try to use IPv6 link local ping (ping6 fe80:...%wlan0) to your
neighbors. If you can ping but batman can't (e.g. use batctl) it's a batman
issue. If both pings don't get through, it's most likely a WiFi driver issue.
In this case, a master or something doesn't help. :)
Cheers,
Simon
On Thursday, April 6, 2017 10:32:29 AM CEST Xuebing Wang wrote:
> Hi community,
>
> We have batman-adv working on OpenWRT Chaos Calmer.
> - Atheros ar9331 MIPS platform + built-in ath9k WiFi
> - batman-adv version 2016.1
> - routing_algos = BATMAN_IV
> - Wireless interface MTU = 1532, adhoc network encryption "psk2-ccmp"
> - bat0 interface MTU = 1500
>
> We have batman-adv running on 10+ sites. For each site, there are 10-20
> nodes in the mesh network.
>
> batman-adv runs almost perfectly (*almost*). Occasionally (occurrence
> rate is low), node drops off the batman-adv / adhoc mesh.
> - Sometimes, node can recover (re-joins the mesh network automatically),
> but not always.
>
> Any suggestions? Does batman-adv works perfectly in the field (i.e.
> running for 1 year with 100+ nodes without any issues)?
>
> What about I use one node as Master, and other nodes ping this Master
> every 10s (or 30 seconds) (to keep mesh from inactivity)? Does this help?
>
> Thanks.
> Xuebing Wang
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^ permalink raw reply [flat|nested] 13+ messages in thread
* Re: [B.A.T.M.A.N.] [batman-adv] Does batman-adv works perfectly?
2017-04-06 2:32 [B.A.T.M.A.N.] [batman-adv] Does batman-adv works perfectly? Xuebing Wang
2017-04-06 7:04 ` Simon Wunderlich
@ 2017-04-06 7:10 ` Sven Eckelmann
1 sibling, 0 replies; 13+ messages in thread
From: Sven Eckelmann @ 2017-04-06 7:10 UTC (permalink / raw)
To: b.a.t.m.a.n; +Cc: Xuebing Wang
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On Donnerstag, 6. April 2017 10:32:29 CEST Xuebing Wang wrote:
> Hi community,
>
> We have batman-adv working on OpenWRT Chaos Calmer.
> - Atheros ar9331 MIPS platform + built-in ath9k WiFi
> - batman-adv version 2016.1
Please update your batman-adv version. This one is known to have problems
which can cause crashes or memory corruptions.
If you are using the Chaos Calmer packages version 2016.1-3 then you should
already have some of the fixes (I think all fixes up to 2016.3 or so). But no
one is updating the Chaos Calmer branch in the openwrt-routing packages feed
anymore. And I doubt that anyone will do that now because LEDE 17.01 was
released a while ago.
[...]
> - Wireless interface MTU = 1532, adhoc network encryption "psk2-ccmp"
[..]
> We have batman-adv running on 10+ sites. For each site, there are 10-20
> nodes in the mesh network.
>
> batman-adv runs almost perfectly (*almost*). Occasionally (occurrence
> rate is low), node drops off the batman-adv / adhoc mesh.
> - Sometimes, node can recover (re-joins the mesh network automatically),
> but not always.
This sounds like problems in the wifi stack/hw. batman-adv is not handling
adhoc or encryption - it is simply using the links which are provided by your
wifi stack/hardware.
Your description therefore looks more like you should fix your wifi. I don't
know why you have low rates but the IBSS problems with enabled encryption
could be caused by an HW issue. You should check out a workaround to refresh
the HW key cache [1] when incoming packets cannot be decrypted anymore.
> Any suggestions? Does batman-adv works perfectly in the field (i.e.
> running for 1 year with 100+ nodes without any issues)?
There are a lot of other components which will fail during that time. For
example your wifi stack
> What about I use one node as Master, and other nodes ping this Master
> every 10s (or 30 seconds) (to keep mesh from inactivity)? Does this help?
I have absolutely no idea against what this should help.
Kind regards,
Sven
[1] https://patchwork.kernel.org/patch/9381651/
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^ permalink raw reply [flat|nested] 13+ messages in thread
* Re: [B.A.T.M.A.N.] [batman-adv] Does batman-adv works perfectly?
2017-04-06 7:04 ` Simon Wunderlich
@ 2017-04-06 7:13 ` Sven Eckelmann
2017-04-06 8:05 ` Xuebing Wang
[not found] ` <CAG5qQ7hQACaP=vz6jmvWDXoK=Sn0wpE3DrDhJv8Qajnhjbp+Og@mail.gmail.com>
2017-04-22 7:12 ` Xuebing Wang
1 sibling, 2 replies; 13+ messages in thread
From: Sven Eckelmann @ 2017-04-06 7:13 UTC (permalink / raw)
To: b.a.t.m.a.n; +Cc: Xuebing Wang
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On Donnerstag, 6. April 2017 09:04:50 CEST Simon Wunderlich wrote:
> Hello Xuebing,
>
> it sounds like you have WiFi driver issues. There are some effects like key
> cache corruption, deafness, and other effects known for the AR93xx series.
Correct, completely forgot about the deaf and 0xdeadbeef issues. There were
also two workarounds for them [1,2] from Simon.
Kind regards,
Sven
[1] https://patchwork.kernel.org/patch/9433619/
[2] https://patchwork.kernel.org/patch/9433621/
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^ permalink raw reply [flat|nested] 13+ messages in thread
* Re: [B.A.T.M.A.N.] [batman-adv] Does batman-adv works perfectly?
2017-04-06 7:13 ` Sven Eckelmann
@ 2017-04-06 8:05 ` Xuebing Wang
2017-04-06 9:27 ` Sven Eckelmann
[not found] ` <CAG5qQ7hQACaP=vz6jmvWDXoK=Sn0wpE3DrDhJv8Qajnhjbp+Og@mail.gmail.com>
1 sibling, 1 reply; 13+ messages in thread
From: Xuebing Wang @ 2017-04-06 8:05 UTC (permalink / raw)
To: Sven Eckelmann, b.a.t.m.a.n
Hi Sven, Simon,
Thank you very much for your help. These 2 patches are not merged
upstream? I did see a similar patch merged (as you 2 are the authors,
you know it very well):
> [1] https://patchwork.kernel.org/patch/9433619/
> [2] https://patchwork.kernel.org/patch/9433621/
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=a34d0a0da1abae46a5f6ebd06fb0ec484ca099d9
Thanks again.
xuebing
On 2017年04月06日 15:13, Sven Eckelmann wrote:
> On Donnerstag, 6. April 2017 09:04:50 CEST Simon Wunderlich wrote:
>> Hello Xuebing,
>>
>> it sounds like you have WiFi driver issues. There are some effects like key
>> cache corruption, deafness, and other effects known for the AR93xx series.
> Correct, completely forgot about the deaf and 0xdeadbeef issues. There were
> also two workarounds for them [1,2] from Simon.
>
> Kind regards,
> Sven
>
> [1] https://patchwork.kernel.org/patch/9433619/
> [2] https://patchwork.kernel.org/patch/9433621/
^ permalink raw reply [flat|nested] 13+ messages in thread
* Re: [B.A.T.M.A.N.] [batman-adv] Does batman-adv works perfectly?
2017-04-06 8:05 ` Xuebing Wang
@ 2017-04-06 9:27 ` Sven Eckelmann
0 siblings, 0 replies; 13+ messages in thread
From: Sven Eckelmann @ 2017-04-06 9:27 UTC (permalink / raw)
To: Xuebing Wang; +Cc: b.a.t.m.a.n
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On Donnerstag, 6. April 2017 16:05:26 CEST Xuebing Wang wrote:
> Hi Sven, Simon,
>
> Thank you very much for your help. These 2 patches are not merged
> upstream? I did see a similar patch merged (as you 2 are the authors,
> you know it very well):
> > [1] https://patchwork.kernel.org/patch/9433619/
> > [2] https://patchwork.kernel.org/patch/9433621/
> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=a34d0a0da1abae46a5f6ebd06fb0ec484ca099d9
>
The deaf patch is not applied upstream. But yes, the deadbeef patch was
modified by Felix and then applied upstream (the commit you've listed here).
And these patches (in patchwork) are much newer than Chaos Calmer. So I would
not expect to see them in the Chaos Calmer mac80211 package.
Kind regards,
Sven
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^ permalink raw reply [flat|nested] 13+ messages in thread
* Re: [B.A.T.M.A.N.] [batman-adv] Does batman-adv works perfectly?
[not found] ` <CAG5qQ7hQACaP=vz6jmvWDXoK=Sn0wpE3DrDhJv8Qajnhjbp+Og@mail.gmail.com>
@ 2017-04-18 10:40 ` Simon Wunderlich
0 siblings, 0 replies; 13+ messages in thread
From: Simon Wunderlich @ 2017-04-18 10:40 UTC (permalink / raw)
To: Xuebing Wang
Cc: Sven Eckelmann, b.a.t.m.a.n, linux-wireless, OpenWrt Development List
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Hi Xuebing,
I didn't try the QSDK on those devices, mainly because of its poor upstream
support/community involvement. We tried it on other devices, with "mixed"
results.
Cheers,
Simon
On Monday, April 17, 2017 10:19:02 PM CEST Xuebing Wang wrote:
> Hi Sven and Simon,
>
> Thank you very much for your help. I am curious that did you try QCA-WiFi
> driver for ath9k device (like AR9331) + OpenWRT, instead of trying to
> improve ath9k driver?
>
> QCA-WiFi driver included in QSDK:
> https://www.codeaurora.org/projects/all-active-projects/qsdk
>
> Thanks.
> Xuebing Wang
>
> On Thu, Apr 6, 2017 at 3:13 PM, Sven Eckelmann <sven@narfation.org> wrote:
> > On Donnerstag, 6. April 2017 09:04:50 CEST Simon Wunderlich wrote:
> > > Hello Xuebing,
> > >
> > > it sounds like you have WiFi driver issues. There are some effects like
> >
> > key
> >
> > > cache corruption, deafness, and other effects known for the AR93xx
> >
> > series.
> >
> > Correct, completely forgot about the deaf and 0xdeadbeef issues. There
> > were
> > also two workarounds for them [1,2] from Simon.
> >
> > Kind regards,
> >
> > Sven
> >
> > [1] https://patchwork.kernel.org/patch/9433619/
> > [2] https://patchwork.kernel.org/patch/9433621/
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^ permalink raw reply [flat|nested] 13+ messages in thread
* Re: [B.A.T.M.A.N.] [batman-adv] Does batman-adv works perfectly?
@ 2017-04-18 10:40 ` Simon Wunderlich
0 siblings, 0 replies; 13+ messages in thread
From: Simon Wunderlich @ 2017-04-18 10:40 UTC (permalink / raw)
To: Xuebing Wang; +Cc: b.a.t.m.a.n, linux-wireless, OpenWrt Development List
[-- Attachment #1: Type: text/plain, Size: 1246 bytes --]
Hi Xuebing,
I didn't try the QSDK on those devices, mainly because of its poor upstream
support/community involvement. We tried it on other devices, with "mixed"
results.
Cheers,
Simon
On Monday, April 17, 2017 10:19:02 PM CEST Xuebing Wang wrote:
> Hi Sven and Simon,
>
> Thank you very much for your help. I am curious that did you try QCA-WiFi
> driver for ath9k device (like AR9331) + OpenWRT, instead of trying to
> improve ath9k driver?
>
> QCA-WiFi driver included in QSDK:
> https://www.codeaurora.org/projects/all-active-projects/qsdk
>
> Thanks.
> Xuebing Wang
>
> On Thu, Apr 6, 2017 at 3:13 PM, Sven Eckelmann <sven@narfation.org> wrote:
> > On Donnerstag, 6. April 2017 09:04:50 CEST Simon Wunderlich wrote:
> > > Hello Xuebing,
> > >
> > > it sounds like you have WiFi driver issues. There are some effects like
> >
> > key
> >
> > > cache corruption, deafness, and other effects known for the AR93xx
> >
> > series.
> >
> > Correct, completely forgot about the deaf and 0xdeadbeef issues. There
> > were
> > also two workarounds for them [1,2] from Simon.
> >
> > Kind regards,
> >
> > Sven
> >
> > [1] https://patchwork.kernel.org/patch/9433619/
> > [2] https://patchwork.kernel.org/patch/9433621/
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^ permalink raw reply [flat|nested] 13+ messages in thread
* Re: [B.A.T.M.A.N.] [batman-adv] Does batman-adv works perfectly?
2017-04-06 7:04 ` Simon Wunderlich
2017-04-06 7:13 ` Sven Eckelmann
@ 2017-04-22 7:12 ` Xuebing Wang
2017-04-22 8:35 ` Simon Wunderlich
1 sibling, 1 reply; 13+ messages in thread
From: Xuebing Wang @ 2017-04-22 7:12 UTC (permalink / raw)
To: Simon Wunderlich, b.a.t.m.a.n, Sven Eckelmann
Hi Simon / Sven,
Do you know any hardware platform on which batman-adv (or batmand) work
perfectly and field-proven? Thanks.
Xuebing Wang
On 2017年04月06日 15:04, Simon Wunderlich wrote:
> Hello Xuebing,
>
> it sounds like you have WiFi driver issues. There are some effects like key
> cache corruption, deafness, and other effects known for the AR93xx series. To
> confirm, you can try to use IPv6 link local ping (ping6 fe80:...%wlan0) to your
> neighbors. If you can ping but batman can't (e.g. use batctl) it's a batman
> issue. If both pings don't get through, it's most likely a WiFi driver issue.
> In this case, a master or something doesn't help. :)
>
> Cheers,
> Simon
>
> On Thursday, April 6, 2017 10:32:29 AM CEST Xuebing Wang wrote:
>> Hi community,
>>
>> We have batman-adv working on OpenWRT Chaos Calmer.
>> - Atheros ar9331 MIPS platform + built-in ath9k WiFi
>> - batman-adv version 2016.1
>> - routing_algos = BATMAN_IV
>> - Wireless interface MTU = 1532, adhoc network encryption "psk2-ccmp"
>> - bat0 interface MTU = 1500
>>
>> We have batman-adv running on 10+ sites. For each site, there are 10-20
>> nodes in the mesh network.
>>
>> batman-adv runs almost perfectly (*almost*). Occasionally (occurrence
>> rate is low), node drops off the batman-adv / adhoc mesh.
>> - Sometimes, node can recover (re-joins the mesh network automatically),
>> but not always.
>>
>> Any suggestions? Does batman-adv works perfectly in the field (i.e.
>> running for 1 year with 100+ nodes without any issues)?
>>
>> What about I use one node as Master, and other nodes ping this Master
>> every 10s (or 30 seconds) (to keep mesh from inactivity)? Does this help?
>>
>> Thanks.
>> Xuebing Wang
^ permalink raw reply [flat|nested] 13+ messages in thread
* Re: [B.A.T.M.A.N.] [batman-adv] Does batman-adv works perfectly?
2017-04-22 7:12 ` Xuebing Wang
@ 2017-04-22 8:35 ` Simon Wunderlich
2017-04-22 12:49 ` Xuebing Wang
2017-04-26 2:49 ` Xuebing Wang
0 siblings, 2 replies; 13+ messages in thread
From: Simon Wunderlich @ 2017-04-22 8:35 UTC (permalink / raw)
To: Xuebing Wang; +Cc: b.a.t.m.a.n
[-- Attachment #1: Type: text/plain, Size: 3281 bytes --]
Hi Xuebing,
actually, ath9k is the most used hardware platform used with batman-adv, at
least as far as I'm aware. It is used commercially as well on some hundred
thousand devices. I would assume that it's very hard (or impossible) to find a
"perfect" running hardware platform and drivers. On other drivers, you will
have trouble to even get IBSS/11s mode running.
The question is, how do you handle faults - usually, there are workarounds
applied which happen automatically like the ones we have referenced in this
thread. They don't happen very often (i.e. less than once a day), and many of
them can be fixed quite fast (except for the deaf problem, which may take ~30
seconds to recover).
However, there are also some problems which happen more often in certain
environments or on certain hardware (maybe due to bad choices in RF design
...). There also may be problems in certain driver versions (i.e.
regressions). And of course, there can be issues which have not yet been
addressed.
BTW, I've just seen that you use psk2-ccmp. There is a known problem with key
cache corruption. I'm not sure if it was already solved and merged in Chaos
Calmer [1]. You may want to try if the problem appears without encryption.
Cheers,
Simon
[1] https://patchwork.kernel.org/patch/9381651/
On Saturday, April 22, 2017 3:12:54 PM CEST Xuebing Wang wrote:
> Hi Simon / Sven,
>
> Do you know any hardware platform on which batman-adv (or batmand) work
> perfectly and field-proven? Thanks.
>
> Xuebing Wang
>
> On 2017年04月06日 15:04, Simon Wunderlich wrote:
> > Hello Xuebing,
> >
> > it sounds like you have WiFi driver issues. There are some effects like
> > key
> > cache corruption, deafness, and other effects known for the AR93xx series.
> > To confirm, you can try to use IPv6 link local ping (ping6
> > fe80:...%wlan0) to your neighbors. If you can ping but batman can't (e.g.
> > use batctl) it's a batman issue. If both pings don't get through, it's
> > most likely a WiFi driver issue. In this case, a master or something
> > doesn't help. :)
> >
> > Cheers,
> >
> > Simon
> >
> > On Thursday, April 6, 2017 10:32:29 AM CEST Xuebing Wang wrote:
> >> Hi community,
> >>
> >> We have batman-adv working on OpenWRT Chaos Calmer.
> >> - Atheros ar9331 MIPS platform + built-in ath9k WiFi
> >> - batman-adv version 2016.1
> >> - routing_algos = BATMAN_IV
> >> - Wireless interface MTU = 1532, adhoc network encryption "psk2-ccmp"
> >> - bat0 interface MTU = 1500
> >>
> >> We have batman-adv running on 10+ sites. For each site, there are 10-20
> >> nodes in the mesh network.
> >>
> >> batman-adv runs almost perfectly (*almost*). Occasionally (occurrence
> >> rate is low), node drops off the batman-adv / adhoc mesh.
> >> - Sometimes, node can recover (re-joins the mesh network automatically),
> >> but not always.
> >>
> >> Any suggestions? Does batman-adv works perfectly in the field (i.e.
> >> running for 1 year with 100+ nodes without any issues)?
> >>
> >> What about I use one node as Master, and other nodes ping this Master
> >> every 10s (or 30 seconds) (to keep mesh from inactivity)? Does this help?
> >>
> >> Thanks.
> >> Xuebing Wang
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^ permalink raw reply [flat|nested] 13+ messages in thread
* Re: [B.A.T.M.A.N.] [batman-adv] Does batman-adv works perfectly?
2017-04-22 8:35 ` Simon Wunderlich
@ 2017-04-22 12:49 ` Xuebing Wang
2017-04-26 2:49 ` Xuebing Wang
1 sibling, 0 replies; 13+ messages in thread
From: Xuebing Wang @ 2017-04-22 12:49 UTC (permalink / raw)
To: Simon Wunderlich; +Cc: b.a.t.m.a.n
Hi Simon,
Thank you very much. Sven pointed to me this key cache corruption
before, but I did not take it because it is a bit complicated. I did
take deaf and 0xdeadbeef patches. Sven, thank you.
I am doing simple change to use software encryption (int
ath9k_modparam_nohwcrypt = 1). It seems working ok for my simple test.
Throughput is down about 2Mbps, which is acceptable. CPU usage is now
60% (on ar9331) for max throughput scp, it is acceptable for my application.
I will put this software encryption in field test, at least it will show
if my issue is related to key cache corruption or not.
Thanks again.
Xuebing Wang
On 2017年04月22日 16:35, Simon Wunderlich wrote:
> Hi Xuebing,
>
> actually, ath9k is the most used hardware platform used with batman-adv, at
> least as far as I'm aware. It is used commercially as well on some hundred
> thousand devices. I would assume that it's very hard (or impossible) to find a
> "perfect" running hardware platform and drivers. On other drivers, you will
> have trouble to even get IBSS/11s mode running.
>
> The question is, how do you handle faults - usually, there are workarounds
> applied which happen automatically like the ones we have referenced in this
> thread. They don't happen very often (i.e. less than once a day), and many of
> them can be fixed quite fast (except for the deaf problem, which may take ~30
> seconds to recover).
>
> However, there are also some problems which happen more often in certain
> environments or on certain hardware (maybe due to bad choices in RF design
> ...). There also may be problems in certain driver versions (i.e.
> regressions). And of course, there can be issues which have not yet been
> addressed.
>
> BTW, I've just seen that you use psk2-ccmp. There is a known problem with key
> cache corruption. I'm not sure if it was already solved and merged in Chaos
> Calmer [1]. You may want to try if the problem appears without encryption.
>
> Cheers,
> Simon
>
> [1] https://patchwork.kernel.org/patch/9381651/
>
> On Saturday, April 22, 2017 3:12:54 PM CEST Xuebing Wang wrote:
>> Hi Simon / Sven,
>>
>> Do you know any hardware platform on which batman-adv (or batmand) work
>> perfectly and field-proven? Thanks.
>>
>> Xuebing Wang
>>
>> On 2017年04月06日 15:04, Simon Wunderlich wrote:
>>> Hello Xuebing,
>>>
>>> it sounds like you have WiFi driver issues. There are some effects like
>>> key
>>> cache corruption, deafness, and other effects known for the AR93xx series.
>>> To confirm, you can try to use IPv6 link local ping (ping6
>>> fe80:...%wlan0) to your neighbors. If you can ping but batman can't (e.g.
>>> use batctl) it's a batman issue. If both pings don't get through, it's
>>> most likely a WiFi driver issue. In this case, a master or something
>>> doesn't help. :)
>>>
>>> Cheers,
>>>
>>> Simon
>>>
>>> On Thursday, April 6, 2017 10:32:29 AM CEST Xuebing Wang wrote:
>>>> Hi community,
>>>>
>>>> We have batman-adv working on OpenWRT Chaos Calmer.
>>>> - Atheros ar9331 MIPS platform + built-in ath9k WiFi
>>>> - batman-adv version 2016.1
>>>> - routing_algos = BATMAN_IV
>>>> - Wireless interface MTU = 1532, adhoc network encryption "psk2-ccmp"
>>>> - bat0 interface MTU = 1500
>>>>
>>>> We have batman-adv running on 10+ sites. For each site, there are 10-20
>>>> nodes in the mesh network.
>>>>
>>>> batman-adv runs almost perfectly (*almost*). Occasionally (occurrence
>>>> rate is low), node drops off the batman-adv / adhoc mesh.
>>>> - Sometimes, node can recover (re-joins the mesh network automatically),
>>>> but not always.
>>>>
>>>> Any suggestions? Does batman-adv works perfectly in the field (i.e.
>>>> running for 1 year with 100+ nodes without any issues)?
>>>>
>>>> What about I use one node as Master, and other nodes ping this Master
>>>> every 10s (or 30 seconds) (to keep mesh from inactivity)? Does this help?
>>>>
>>>> Thanks.
>>>> Xuebing Wang
^ permalink raw reply [flat|nested] 13+ messages in thread
* Re: [B.A.T.M.A.N.] [batman-adv] Does batman-adv works perfectly?
2017-04-22 8:35 ` Simon Wunderlich
2017-04-22 12:49 ` Xuebing Wang
@ 2017-04-26 2:49 ` Xuebing Wang
2017-04-26 7:46 ` Simon Wunderlich
1 sibling, 1 reply; 13+ messages in thread
From: Xuebing Wang @ 2017-04-26 2:49 UTC (permalink / raw)
To: Simon Wunderlich; +Cc: b.a.t.m.a.n
Hi Simon,
=> It is used commercially as well on some hundred thousand devices.
Are you saying that batman-adv has hundred of thousands (100,000+) nodes
installed? Thanks for your always help.
Xuebing Wang
On 2017年04月22日 16:35, Simon Wunderlich wrote:
> Hi Xuebing,
>
> actually, ath9k is the most used hardware platform used with batman-adv, at
> least as far as I'm aware. It is used commercially as well on some hundred
> thousand devices. I would assume that it's very hard (or impossible) to find a
> "perfect" running hardware platform and drivers. On other drivers, you will
> have trouble to even get IBSS/11s mode running.
>
> The question is, how do you handle faults - usually, there are workarounds
> applied which happen automatically like the ones we have referenced in this
> thread. They don't happen very often (i.e. less than once a day), and many of
> them can be fixed quite fast (except for the deaf problem, which may take ~30
> seconds to recover).
>
> However, there are also some problems which happen more often in certain
> environments or on certain hardware (maybe due to bad choices in RF design
> ...). There also may be problems in certain driver versions (i.e.
> regressions). And of course, there can be issues which have not yet been
> addressed.
>
> BTW, I've just seen that you use psk2-ccmp. There is a known problem with key
> cache corruption. I'm not sure if it was already solved and merged in Chaos
> Calmer [1]. You may want to try if the problem appears without encryption.
>
> Cheers,
> Simon
>
> [1] https://patchwork.kernel.org/patch/9381651/
>
> On Saturday, April 22, 2017 3:12:54 PM CEST Xuebing Wang wrote:
>> Hi Simon / Sven,
>>
>> Do you know any hardware platform on which batman-adv (or batmand) work
>> perfectly and field-proven? Thanks.
>>
>> Xuebing Wang
>>
>> On 2017年04月06日 15:04, Simon Wunderlich wrote:
>>> Hello Xuebing,
>>>
>>> it sounds like you have WiFi driver issues. There are some effects like
>>> key
>>> cache corruption, deafness, and other effects known for the AR93xx series.
>>> To confirm, you can try to use IPv6 link local ping (ping6
>>> fe80:...%wlan0) to your neighbors. If you can ping but batman can't (e.g.
>>> use batctl) it's a batman issue. If both pings don't get through, it's
>>> most likely a WiFi driver issue. In this case, a master or something
>>> doesn't help. :)
>>>
>>> Cheers,
>>>
>>> Simon
>>>
>>> On Thursday, April 6, 2017 10:32:29 AM CEST Xuebing Wang wrote:
>>>> Hi community,
>>>>
>>>> We have batman-adv working on OpenWRT Chaos Calmer.
>>>> - Atheros ar9331 MIPS platform + built-in ath9k WiFi
>>>> - batman-adv version 2016.1
>>>> - routing_algos = BATMAN_IV
>>>> - Wireless interface MTU = 1532, adhoc network encryption "psk2-ccmp"
>>>> - bat0 interface MTU = 1500
>>>>
>>>> We have batman-adv running on 10+ sites. For each site, there are 10-20
>>>> nodes in the mesh network.
>>>>
>>>> batman-adv runs almost perfectly (*almost*). Occasionally (occurrence
>>>> rate is low), node drops off the batman-adv / adhoc mesh.
>>>> - Sometimes, node can recover (re-joins the mesh network automatically),
>>>> but not always.
>>>>
>>>> Any suggestions? Does batman-adv works perfectly in the field (i.e.
>>>> running for 1 year with 100+ nodes without any issues)?
>>>>
>>>> What about I use one node as Master, and other nodes ping this Master
>>>> every 10s (or 30 seconds) (to keep mesh from inactivity)? Does this help?
>>>>
>>>> Thanks.
>>>> Xuebing Wang
^ permalink raw reply [flat|nested] 13+ messages in thread
* Re: [B.A.T.M.A.N.] [batman-adv] Does batman-adv works perfectly?
2017-04-26 2:49 ` Xuebing Wang
@ 2017-04-26 7:46 ` Simon Wunderlich
0 siblings, 0 replies; 13+ messages in thread
From: Simon Wunderlich @ 2017-04-26 7:46 UTC (permalink / raw)
To: Xuebing Wang; +Cc: b.a.t.m.a.n
[-- Attachment #1: Type: text/plain, Size: 554 bytes --]
Hi Xuebing, On Wednesday, April 26, 2017 10:49:37 AM CEST Xuebing Wang wrote:
> Hi Simon,
>
> => It is used commercially as well on some hundred thousand devices.
>
> Are you saying that batman-adv has hundred of thousands (100,000+) nodes
> installed? Thanks for your always help.
Yes, installed and actively in use. The devices having batman-adv installed
are probably some millions, since many Linux PC distributions ship the module
along with their Linux kernel. On Debian for example, batman-adv is just an
insmod away. ;)
Cheers,
Simon
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^ permalink raw reply [flat|nested] 13+ messages in thread
end of thread, other threads:[~2017-04-26 7:46 UTC | newest]
Thread overview: 13+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2017-04-06 2:32 [B.A.T.M.A.N.] [batman-adv] Does batman-adv works perfectly? Xuebing Wang
2017-04-06 7:04 ` Simon Wunderlich
2017-04-06 7:13 ` Sven Eckelmann
2017-04-06 8:05 ` Xuebing Wang
2017-04-06 9:27 ` Sven Eckelmann
[not found] ` <CAG5qQ7hQACaP=vz6jmvWDXoK=Sn0wpE3DrDhJv8Qajnhjbp+Og@mail.gmail.com>
2017-04-18 10:40 ` Simon Wunderlich
2017-04-18 10:40 ` Simon Wunderlich
2017-04-22 7:12 ` Xuebing Wang
2017-04-22 8:35 ` Simon Wunderlich
2017-04-22 12:49 ` Xuebing Wang
2017-04-26 2:49 ` Xuebing Wang
2017-04-26 7:46 ` Simon Wunderlich
2017-04-06 7:10 ` Sven Eckelmann
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