* [PATCH net] macvtap: unbreak receiving of gro skb with frag list
@ 2015-10-23 4:57 Jason Wang
2015-10-23 9:35 ` David Miller
2015-10-23 13:37 ` Michael S. Tsirkin
0 siblings, 2 replies; 10+ messages in thread
From: Jason Wang @ 2015-10-23 4:57 UTC (permalink / raw)
To: netdev, linux-kernel; +Cc: mst, Jason Wang, Vlad Yasevich
We don't have fraglist support in TAP_FEATURES. This will lead
software segmentation of gro skb with frag list. Fixes by having
frag list support in TAP_FEATURES.
With this patch single session of netperf receiving were restored from
about 5Gb/s to about 12Gb/s on mlx4.
Fixes a567dd6252 ("macvtap: simplify usage of tap_features")
Cc: Vlad Yasevich <vyasevic@redhat.com>
Cc: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
---
drivers/net/macvtap.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/net/macvtap.c b/drivers/net/macvtap.c
index 248478c..197c939 100644
--- a/drivers/net/macvtap.c
+++ b/drivers/net/macvtap.c
@@ -137,7 +137,7 @@ static const struct proto_ops macvtap_socket_ops;
#define TUN_OFFLOADS (NETIF_F_HW_CSUM | NETIF_F_TSO_ECN | NETIF_F_TSO | \
NETIF_F_TSO6 | NETIF_F_UFO)
#define RX_OFFLOADS (NETIF_F_GRO | NETIF_F_LRO)
-#define TAP_FEATURES (NETIF_F_GSO | NETIF_F_SG)
+#define TAP_FEATURES (NETIF_F_GSO | NETIF_F_SG | NETIF_F_FRAGLIST)
static struct macvlan_dev *macvtap_get_vlan_rcu(const struct net_device *dev)
{
--
1.8.3.1
^ permalink raw reply related [flat|nested] 10+ messages in thread
* Re: [PATCH net] macvtap: unbreak receiving of gro skb with frag list
2015-10-23 4:57 [PATCH net] macvtap: unbreak receiving of gro skb with frag list Jason Wang
@ 2015-10-23 9:35 ` David Miller
2015-10-23 13:37 ` Michael S. Tsirkin
1 sibling, 0 replies; 10+ messages in thread
From: David Miller @ 2015-10-23 9:35 UTC (permalink / raw)
To: jasowang; +Cc: netdev, linux-kernel, mst, vyasevic
From: Jason Wang <jasowang@redhat.com>
Date: Fri, 23 Oct 2015 00:57:05 -0400
> We don't have fraglist support in TAP_FEATURES. This will lead
> software segmentation of gro skb with frag list. Fixes by having
> frag list support in TAP_FEATURES.
>
> With this patch single session of netperf receiving were restored from
> about 5Gb/s to about 12Gb/s on mlx4.
>
> Fixes a567dd6252 ("macvtap: simplify usage of tap_features")
> Cc: Vlad Yasevich <vyasevic@redhat.com>
> Cc: Michael S. Tsirkin <mst@redhat.com>
> Signed-off-by: Jason Wang <jasowang@redhat.com>
Applied and queued up for -stable, thanks Jason.
^ permalink raw reply [flat|nested] 10+ messages in thread
* Re: [PATCH net] macvtap: unbreak receiving of gro skb with frag list
2015-10-23 4:57 [PATCH net] macvtap: unbreak receiving of gro skb with frag list Jason Wang
2015-10-23 9:35 ` David Miller
@ 2015-10-23 13:37 ` Michael S. Tsirkin
2015-10-26 3:15 ` Jason Wang
1 sibling, 1 reply; 10+ messages in thread
From: Michael S. Tsirkin @ 2015-10-23 13:37 UTC (permalink / raw)
To: Jason Wang; +Cc: netdev, linux-kernel, Vlad Yasevich
On Fri, Oct 23, 2015 at 12:57:05AM -0400, Jason Wang wrote:
> We don't have fraglist support in TAP_FEATURES. This will lead
> software segmentation of gro skb with frag list. Fixes by having
> frag list support in TAP_FEATURES.
>
> With this patch single session of netperf receiving were restored from
> about 5Gb/s to about 12Gb/s on mlx4.
>
> Fixes a567dd6252 ("macvtap: simplify usage of tap_features")
> Cc: Vlad Yasevich <vyasevic@redhat.com>
> Cc: Michael S. Tsirkin <mst@redhat.com>
> Signed-off-by: Jason Wang <jasowang@redhat.com>
Thanks!
Does this mean we should look at re-adding NETIF_F_FRAGLIST
to virtio-net as well?
> ---
> drivers/net/macvtap.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/net/macvtap.c b/drivers/net/macvtap.c
> index 248478c..197c939 100644
> --- a/drivers/net/macvtap.c
> +++ b/drivers/net/macvtap.c
> @@ -137,7 +137,7 @@ static const struct proto_ops macvtap_socket_ops;
> #define TUN_OFFLOADS (NETIF_F_HW_CSUM | NETIF_F_TSO_ECN | NETIF_F_TSO | \
> NETIF_F_TSO6 | NETIF_F_UFO)
> #define RX_OFFLOADS (NETIF_F_GRO | NETIF_F_LRO)
> -#define TAP_FEATURES (NETIF_F_GSO | NETIF_F_SG)
> +#define TAP_FEATURES (NETIF_F_GSO | NETIF_F_SG | NETIF_F_FRAGLIST)
>
> static struct macvlan_dev *macvtap_get_vlan_rcu(const struct net_device *dev)
> {
> --
> 1.8.3.1
^ permalink raw reply [flat|nested] 10+ messages in thread
* Re: [PATCH net] macvtap: unbreak receiving of gro skb with frag list
2015-10-23 13:37 ` Michael S. Tsirkin
@ 2015-10-26 3:15 ` Jason Wang
2015-10-26 6:09 ` Michael S. Tsirkin
0 siblings, 1 reply; 10+ messages in thread
From: Jason Wang @ 2015-10-26 3:15 UTC (permalink / raw)
To: Michael S. Tsirkin; +Cc: netdev, linux-kernel, Vlad Yasevich
On 10/23/2015 09:37 PM, Michael S. Tsirkin wrote:
> On Fri, Oct 23, 2015 at 12:57:05AM -0400, Jason Wang wrote:
>> We don't have fraglist support in TAP_FEATURES. This will lead
>> software segmentation of gro skb with frag list. Fixes by having
>> frag list support in TAP_FEATURES.
>>
>> With this patch single session of netperf receiving were restored from
>> about 5Gb/s to about 12Gb/s on mlx4.
>>
>> Fixes a567dd6252 ("macvtap: simplify usage of tap_features")
>> Cc: Vlad Yasevich <vyasevic@redhat.com>
>> Cc: Michael S. Tsirkin <mst@redhat.com>
>> Signed-off-by: Jason Wang <jasowang@redhat.com>
> Thanks!
> Does this mean we should look at re-adding NETIF_F_FRAGLIST
> to virtio-net as well?
Not sure I get the point, but probably not. This is for receiving and
skb_copy_datagram_iter() can deal with frag list.
>
>> ---
>> drivers/net/macvtap.c | 2 +-
>> 1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/drivers/net/macvtap.c b/drivers/net/macvtap.c
>> index 248478c..197c939 100644
>> --- a/drivers/net/macvtap.c
>> +++ b/drivers/net/macvtap.c
>> @@ -137,7 +137,7 @@ static const struct proto_ops macvtap_socket_ops;
>> #define TUN_OFFLOADS (NETIF_F_HW_CSUM | NETIF_F_TSO_ECN | NETIF_F_TSO | \
>> NETIF_F_TSO6 | NETIF_F_UFO)
>> #define RX_OFFLOADS (NETIF_F_GRO | NETIF_F_LRO)
>> -#define TAP_FEATURES (NETIF_F_GSO | NETIF_F_SG)
>> +#define TAP_FEATURES (NETIF_F_GSO | NETIF_F_SG | NETIF_F_FRAGLIST)
>>
>> static struct macvlan_dev *macvtap_get_vlan_rcu(const struct net_device *dev)
>> {
>> --
>> 1.8.3.1
> --
> To unsubscribe from this list: send the line "unsubscribe netdev" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at http://vger.kernel.org/majordomo-info.html
^ permalink raw reply [flat|nested] 10+ messages in thread
* Re: [PATCH net] macvtap: unbreak receiving of gro skb with frag list
2015-10-26 3:15 ` Jason Wang
@ 2015-10-26 6:09 ` Michael S. Tsirkin
2015-10-26 6:53 ` Jason Wang
0 siblings, 1 reply; 10+ messages in thread
From: Michael S. Tsirkin @ 2015-10-26 6:09 UTC (permalink / raw)
To: Jason Wang; +Cc: netdev, linux-kernel, Vlad Yasevich
On Mon, Oct 26, 2015 at 11:15:57AM +0800, Jason Wang wrote:
>
>
> On 10/23/2015 09:37 PM, Michael S. Tsirkin wrote:
> > On Fri, Oct 23, 2015 at 12:57:05AM -0400, Jason Wang wrote:
> >> We don't have fraglist support in TAP_FEATURES. This will lead
> >> software segmentation of gro skb with frag list. Fixes by having
> >> frag list support in TAP_FEATURES.
> >>
> >> With this patch single session of netperf receiving were restored from
> >> about 5Gb/s to about 12Gb/s on mlx4.
> >>
> >> Fixes a567dd6252 ("macvtap: simplify usage of tap_features")
> >> Cc: Vlad Yasevich <vyasevic@redhat.com>
> >> Cc: Michael S. Tsirkin <mst@redhat.com>
> >> Signed-off-by: Jason Wang <jasowang@redhat.com>
> > Thanks!
> > Does this mean we should look at re-adding NETIF_F_FRAGLIST
> > to virtio-net as well?
>
> Not sure I get the point, but probably not. This is for receiving and
> skb_copy_datagram_iter() can deal with frag list.
Point is:
- bridge within guest
- assigned device creating gro skbs with frag list bridged to virtio
> >
> >> ---
> >> drivers/net/macvtap.c | 2 +-
> >> 1 file changed, 1 insertion(+), 1 deletion(-)
> >>
> >> diff --git a/drivers/net/macvtap.c b/drivers/net/macvtap.c
> >> index 248478c..197c939 100644
> >> --- a/drivers/net/macvtap.c
> >> +++ b/drivers/net/macvtap.c
> >> @@ -137,7 +137,7 @@ static const struct proto_ops macvtap_socket_ops;
> >> #define TUN_OFFLOADS (NETIF_F_HW_CSUM | NETIF_F_TSO_ECN | NETIF_F_TSO | \
> >> NETIF_F_TSO6 | NETIF_F_UFO)
> >> #define RX_OFFLOADS (NETIF_F_GRO | NETIF_F_LRO)
> >> -#define TAP_FEATURES (NETIF_F_GSO | NETIF_F_SG)
> >> +#define TAP_FEATURES (NETIF_F_GSO | NETIF_F_SG | NETIF_F_FRAGLIST)
> >>
> >> static struct macvlan_dev *macvtap_get_vlan_rcu(const struct net_device *dev)
> >> {
> >> --
> >> 1.8.3.1
> > --
> > To unsubscribe from this list: send the line "unsubscribe netdev" in
> > the body of a message to majordomo@vger.kernel.org
> > More majordomo info at http://vger.kernel.org/majordomo-info.html
^ permalink raw reply [flat|nested] 10+ messages in thread
* Re: [PATCH net] macvtap: unbreak receiving of gro skb with frag list
2015-10-26 6:09 ` Michael S. Tsirkin
@ 2015-10-26 6:53 ` Jason Wang
2015-10-26 8:30 ` Michael S. Tsirkin
0 siblings, 1 reply; 10+ messages in thread
From: Jason Wang @ 2015-10-26 6:53 UTC (permalink / raw)
To: Michael S. Tsirkin; +Cc: netdev, linux-kernel, Vlad Yasevich
On 10/26/2015 02:09 PM, Michael S. Tsirkin wrote:
> On Mon, Oct 26, 2015 at 11:15:57AM +0800, Jason Wang wrote:
>>
>> On 10/23/2015 09:37 PM, Michael S. Tsirkin wrote:
>>> On Fri, Oct 23, 2015 at 12:57:05AM -0400, Jason Wang wrote:
>>>> We don't have fraglist support in TAP_FEATURES. This will lead
>>>> software segmentation of gro skb with frag list. Fixes by having
>>>> frag list support in TAP_FEATURES.
>>>>
>>>> With this patch single session of netperf receiving were restored from
>>>> about 5Gb/s to about 12Gb/s on mlx4.
>>>>
>>>> Fixes a567dd6252 ("macvtap: simplify usage of tap_features")
>>>> Cc: Vlad Yasevich <vyasevic@redhat.com>
>>>> Cc: Michael S. Tsirkin <mst@redhat.com>
>>>> Signed-off-by: Jason Wang <jasowang@redhat.com>
>>> Thanks!
>>> Does this mean we should look at re-adding NETIF_F_FRAGLIST
>>> to virtio-net as well?
>> Not sure I get the point, but probably not. This is for receiving and
>> skb_copy_datagram_iter() can deal with frag list.
>
> Point is:
> - bridge within guest
> - assigned device creating gro skbs with frag list bridged to virtio
I see, but this problem looks not specific to virtio. Most cards does
not support frag list.
^ permalink raw reply [flat|nested] 10+ messages in thread
* Re: [PATCH net] macvtap: unbreak receiving of gro skb with frag list
2015-10-26 6:53 ` Jason Wang
@ 2015-10-26 8:30 ` Michael S. Tsirkin
2015-10-27 2:58 ` Jason Wang
0 siblings, 1 reply; 10+ messages in thread
From: Michael S. Tsirkin @ 2015-10-26 8:30 UTC (permalink / raw)
To: Jason Wang; +Cc: netdev, linux-kernel, Vlad Yasevich
On Mon, Oct 26, 2015 at 02:53:38PM +0800, Jason Wang wrote:
>
>
> On 10/26/2015 02:09 PM, Michael S. Tsirkin wrote:
> > On Mon, Oct 26, 2015 at 11:15:57AM +0800, Jason Wang wrote:
> >>
> >> On 10/23/2015 09:37 PM, Michael S. Tsirkin wrote:
> >>> On Fri, Oct 23, 2015 at 12:57:05AM -0400, Jason Wang wrote:
> >>>> We don't have fraglist support in TAP_FEATURES. This will lead
> >>>> software segmentation of gro skb with frag list. Fixes by having
> >>>> frag list support in TAP_FEATURES.
> >>>>
> >>>> With this patch single session of netperf receiving were restored from
> >>>> about 5Gb/s to about 12Gb/s on mlx4.
> >>>>
> >>>> Fixes a567dd6252 ("macvtap: simplify usage of tap_features")
> >>>> Cc: Vlad Yasevich <vyasevic@redhat.com>
> >>>> Cc: Michael S. Tsirkin <mst@redhat.com>
> >>>> Signed-off-by: Jason Wang <jasowang@redhat.com>
> >>> Thanks!
> >>> Does this mean we should look at re-adding NETIF_F_FRAGLIST
> >>> to virtio-net as well?
> >> Not sure I get the point, but probably not. This is for receiving and
> >> skb_copy_datagram_iter() can deal with frag list.
> >
> > Point is:
> > - bridge within guest
> > - assigned device creating gro skbs with frag list bridged to virtio
>
> I see, but this problem looks not specific to virtio. Most cards does
> not support frag list.
These will be slower when used with a bridge then, won't they?
--
MST
^ permalink raw reply [flat|nested] 10+ messages in thread
* Re: [PATCH net] macvtap: unbreak receiving of gro skb with frag list
2015-10-26 8:30 ` Michael S. Tsirkin
@ 2015-10-27 2:58 ` Jason Wang
2015-10-27 9:05 ` Michael S. Tsirkin
0 siblings, 1 reply; 10+ messages in thread
From: Jason Wang @ 2015-10-27 2:58 UTC (permalink / raw)
To: Michael S. Tsirkin; +Cc: netdev, linux-kernel, Vlad Yasevich
On 10/26/2015 04:30 PM, Michael S. Tsirkin wrote:
> On Mon, Oct 26, 2015 at 02:53:38PM +0800, Jason Wang wrote:
>>
>> On 10/26/2015 02:09 PM, Michael S. Tsirkin wrote:
>>> On Mon, Oct 26, 2015 at 11:15:57AM +0800, Jason Wang wrote:
>>>> On 10/23/2015 09:37 PM, Michael S. Tsirkin wrote:
>>>>> On Fri, Oct 23, 2015 at 12:57:05AM -0400, Jason Wang wrote:
>>>>>> We don't have fraglist support in TAP_FEATURES. This will lead
>>>>>> software segmentation of gro skb with frag list. Fixes by having
>>>>>> frag list support in TAP_FEATURES.
>>>>>>
>>>>>> With this patch single session of netperf receiving were restored from
>>>>>> about 5Gb/s to about 12Gb/s on mlx4.
>>>>>>
>>>>>> Fixes a567dd6252 ("macvtap: simplify usage of tap_features")
>>>>>> Cc: Vlad Yasevich <vyasevic@redhat.com>
>>>>>> Cc: Michael S. Tsirkin <mst@redhat.com>
>>>>>> Signed-off-by: Jason Wang <jasowang@redhat.com>
>>>>> Thanks!
>>>>> Does this mean we should look at re-adding NETIF_F_FRAGLIST
>>>>> to virtio-net as well?
>>>> Not sure I get the point, but probably not. This is for receiving and
>>>> skb_copy_datagram_iter() can deal with frag list.
>>> Point is:
>>> - bridge within guest
>>> - assigned device creating gro skbs with frag list bridged to virtio
>> I see, but this problem looks not specific to virtio. Most cards does
>> not support frag list.
> These will be slower when used with a bridge then, won't they?
For forwarding, not sure. GRO has latency and cpu overhead anyway.
Anyway I can try to add the support for this.
^ permalink raw reply [flat|nested] 10+ messages in thread
* Re: [PATCH net] macvtap: unbreak receiving of gro skb with frag list
2015-10-27 2:58 ` Jason Wang
@ 2015-10-27 9:05 ` Michael S. Tsirkin
2015-10-28 2:51 ` Jason Wang
0 siblings, 1 reply; 10+ messages in thread
From: Michael S. Tsirkin @ 2015-10-27 9:05 UTC (permalink / raw)
To: Jason Wang; +Cc: netdev, linux-kernel, Vlad Yasevich
On Tue, Oct 27, 2015 at 10:58:25AM +0800, Jason Wang wrote:
>
>
> On 10/26/2015 04:30 PM, Michael S. Tsirkin wrote:
> > On Mon, Oct 26, 2015 at 02:53:38PM +0800, Jason Wang wrote:
> >>
> >> On 10/26/2015 02:09 PM, Michael S. Tsirkin wrote:
> >>> On Mon, Oct 26, 2015 at 11:15:57AM +0800, Jason Wang wrote:
> >>>> On 10/23/2015 09:37 PM, Michael S. Tsirkin wrote:
> >>>>> On Fri, Oct 23, 2015 at 12:57:05AM -0400, Jason Wang wrote:
> >>>>>> We don't have fraglist support in TAP_FEATURES. This will lead
> >>>>>> software segmentation of gro skb with frag list. Fixes by having
> >>>>>> frag list support in TAP_FEATURES.
> >>>>>>
> >>>>>> With this patch single session of netperf receiving were restored from
> >>>>>> about 5Gb/s to about 12Gb/s on mlx4.
> >>>>>>
> >>>>>> Fixes a567dd6252 ("macvtap: simplify usage of tap_features")
> >>>>>> Cc: Vlad Yasevich <vyasevic@redhat.com>
> >>>>>> Cc: Michael S. Tsirkin <mst@redhat.com>
> >>>>>> Signed-off-by: Jason Wang <jasowang@redhat.com>
> >>>>> Thanks!
> >>>>> Does this mean we should look at re-adding NETIF_F_FRAGLIST
> >>>>> to virtio-net as well?
> >>>> Not sure I get the point, but probably not. This is for receiving and
> >>>> skb_copy_datagram_iter() can deal with frag list.
> >>> Point is:
> >>> - bridge within guest
> >>> - assigned device creating gro skbs with frag list bridged to virtio
> >> I see, but this problem looks not specific to virtio. Most cards does
> >> not support frag list.
> > These will be slower when used with a bridge then, won't they?
>
> For forwarding, not sure. GRO has latency and cpu overhead anyway.
Right but that's up to the user. You aren't disabling GRO
on source, you are just splitting it up.
> Anyway I can try to add the support for this.
Which reminds me: on modern devices there are commands to control
offloads, so for these, we should support turning offloads on/off using
ethtool.
--
MST
^ permalink raw reply [flat|nested] 10+ messages in thread
* Re: [PATCH net] macvtap: unbreak receiving of gro skb with frag list
2015-10-27 9:05 ` Michael S. Tsirkin
@ 2015-10-28 2:51 ` Jason Wang
0 siblings, 0 replies; 10+ messages in thread
From: Jason Wang @ 2015-10-28 2:51 UTC (permalink / raw)
To: Michael S. Tsirkin; +Cc: netdev, linux-kernel, Vlad Yasevich
On 10/27/2015 05:05 PM, Michael S. Tsirkin wrote:
> On Tue, Oct 27, 2015 at 10:58:25AM +0800, Jason Wang wrote:
>>
>> On 10/26/2015 04:30 PM, Michael S. Tsirkin wrote:
>>> On Mon, Oct 26, 2015 at 02:53:38PM +0800, Jason Wang wrote:
>>>> On 10/26/2015 02:09 PM, Michael S. Tsirkin wrote:
>>>>> On Mon, Oct 26, 2015 at 11:15:57AM +0800, Jason Wang wrote:
>>>>>> On 10/23/2015 09:37 PM, Michael S. Tsirkin wrote:
>>>>>>> On Fri, Oct 23, 2015 at 12:57:05AM -0400, Jason Wang wrote:
>>>>>>>> We don't have fraglist support in TAP_FEATURES. This will lead
>>>>>>>> software segmentation of gro skb with frag list. Fixes by having
>>>>>>>> frag list support in TAP_FEATURES.
>>>>>>>>
>>>>>>>> With this patch single session of netperf receiving were restored from
>>>>>>>> about 5Gb/s to about 12Gb/s on mlx4.
>>>>>>>>
>>>>>>>> Fixes a567dd6252 ("macvtap: simplify usage of tap_features")
>>>>>>>> Cc: Vlad Yasevich <vyasevic@redhat.com>
>>>>>>>> Cc: Michael S. Tsirkin <mst@redhat.com>
>>>>>>>> Signed-off-by: Jason Wang <jasowang@redhat.com>
>>>>>>> Thanks!
>>>>>>> Does this mean we should look at re-adding NETIF_F_FRAGLIST
>>>>>>> to virtio-net as well?
>>>>>> Not sure I get the point, but probably not. This is for receiving and
>>>>>> skb_copy_datagram_iter() can deal with frag list.
>>>>> Point is:
>>>>> - bridge within guest
>>>>> - assigned device creating gro skbs with frag list bridged to virtio
>>>> I see, but this problem looks not specific to virtio. Most cards does
>>>> not support frag list.
>>> These will be slower when used with a bridge then, won't they?
>> For forwarding, not sure. GRO has latency and cpu overhead anyway.
> Right but that's up to the user. You aren't disabling GRO
> on source, you are just splitting it up.
>
>> Anyway I can try to add the support for this.
> Which reminds me: on modern devices there are commands to control
> offloads, so for these, we should support turning offloads on/off using
> ethtool.
>
Trying to implement frag list but see a problem. Looks like driver need
to scan the possible number of io vectors? (Since vhost support max to
UIO_MAXIOV number of io vectors). Looks like there's no clarification on
this in the spec. (Which only limit the length of descriptor chain to
Queue size).
^ permalink raw reply [flat|nested] 10+ messages in thread
end of thread, other threads:[~2015-10-28 2:51 UTC | newest]
Thread overview: 10+ messages (download: mbox.gz / follow: Atom feed)
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2015-10-23 4:57 [PATCH net] macvtap: unbreak receiving of gro skb with frag list Jason Wang
2015-10-23 9:35 ` David Miller
2015-10-23 13:37 ` Michael S. Tsirkin
2015-10-26 3:15 ` Jason Wang
2015-10-26 6:09 ` Michael S. Tsirkin
2015-10-26 6:53 ` Jason Wang
2015-10-26 8:30 ` Michael S. Tsirkin
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2015-10-28 2:51 ` Jason Wang
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