* [PATCH net-next] r8169: disable TSO on a single version of RTL8168c to fix performance
@ 2019-11-18 9:55 Corinna Vinschen
2019-11-18 19:33 ` Heiner Kallweit
0 siblings, 1 reply; 7+ messages in thread
From: Corinna Vinschen @ 2019-11-18 9:55 UTC (permalink / raw)
To: netdev; +Cc: Heiner Kallweit, nic_swsd, David Miller
During performance testing, I found that one of my r8169 NICs suffered
a major performance loss, a 8168c model.
Running netperf's TCP_STREAM test didn't return the expected
throughput of > 900 Mb/s, but rather only about 22 Mb/s. Strange
enough, running the TCP_MAERTS and UDP_STREAM tests all returned with
throughput > 900 Mb/s, as did TCP_STREAM with the other r8169 NICs I can
test (either one of 8169s, 8168e, 8168f).
Bisecting turned up commit 93681cd7d94f83903cb3f0f95433d10c28a7e9a5,
"r8169: enable HW csum and TSO" as the culprit.
I added my 8168c version, RTL_GIGA_MAC_VER_22, to the code
special-casing the 8168evl as per the patch below. This fixed the
performance problem for me.
Fixes: 93681cd7d94f ("r8169: enable HW csum and TSO")
Signed-off-by: Corinna Vinschen <vinschen@redhat.com>
---
drivers/net/ethernet/realtek/r8169_main.c | 8 ++++++--
1 file changed, 6 insertions(+), 2 deletions(-)
diff --git a/drivers/net/ethernet/realtek/r8169_main.c b/drivers/net/ethernet/realtek/r8169_main.c
index d8fcdb9db8d1..1de11ac05bd6 100644
--- a/drivers/net/ethernet/realtek/r8169_main.c
+++ b/drivers/net/ethernet/realtek/r8169_main.c
@@ -6952,8 +6952,12 @@ static int rtl_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
dev->gso_max_segs = RTL_GSO_MAX_SEGS_V1;
}
- /* RTL8168e-vl has a HW issue with TSO */
- if (tp->mac_version == RTL_GIGA_MAC_VER_34) {
+ /*
+ * RTL8168e-vl and one RTL8168c variant are known to have a
+ * HW issue with TSO.
+ */
+ if (tp->mac_version == RTL_GIGA_MAC_VER_34 ||
+ tp->mac_version == RTL_GIGA_MAC_VER_22) {
dev->vlan_features &= ~(NETIF_F_ALL_TSO | NETIF_F_SG);
dev->hw_features &= ~(NETIF_F_ALL_TSO | NETIF_F_SG);
dev->features &= ~(NETIF_F_ALL_TSO | NETIF_F_SG);
--
2.20.1
^ permalink raw reply related [flat|nested] 7+ messages in thread
* Re: [PATCH net-next] r8169: disable TSO on a single version of RTL8168c to fix performance
2019-11-18 9:55 [PATCH net-next] r8169: disable TSO on a single version of RTL8168c to fix performance Corinna Vinschen
@ 2019-11-18 19:33 ` Heiner Kallweit
2019-11-19 9:09 ` [PATCH net] " Corinna Vinschen
2019-11-19 9:12 ` [PATCH net-next] " Corinna Vinschen
0 siblings, 2 replies; 7+ messages in thread
From: Heiner Kallweit @ 2019-11-18 19:33 UTC (permalink / raw)
To: Corinna Vinschen, netdev; +Cc: nic_swsd, David Miller
On 18.11.2019 10:55, Corinna Vinschen wrote:
> During performance testing, I found that one of my r8169 NICs suffered
> a major performance loss, a 8168c model.
>
> Running netperf's TCP_STREAM test didn't return the expected
> throughput of > 900 Mb/s, but rather only about 22 Mb/s. Strange
> enough, running the TCP_MAERTS and UDP_STREAM tests all returned with
> throughput > 900 Mb/s, as did TCP_STREAM with the other r8169 NICs I can
> test (either one of 8169s, 8168e, 8168f).
>
> Bisecting turned up commit 93681cd7d94f83903cb3f0f95433d10c28a7e9a5,
> "r8169: enable HW csum and TSO" as the culprit.
>
> I added my 8168c version, RTL_GIGA_MAC_VER_22, to the code
> special-casing the 8168evl as per the patch below. This fixed the
> performance problem for me.
>
> Fixes: 93681cd7d94f ("r8169: enable HW csum and TSO")
> Signed-off-by: Corinna Vinschen <vinschen@redhat.com>
Thanks for reporting and the fix. Just two small nits:
- fix should be annotated "net", not "net-next"
- comment blocks in net subsystem don't have /* on a separate line
Apart from that:
Reviewed-by: Heiner Kallweit <hkallweit1@gmail.com>
Out of curiosity: Did you test also with iperf3? If yes,
do you see the same issue?
> ---
> drivers/net/ethernet/realtek/r8169_main.c | 8 ++++++--
> 1 file changed, 6 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/net/ethernet/realtek/r8169_main.c b/drivers/net/ethernet/realtek/r8169_main.c
> index d8fcdb9db8d1..1de11ac05bd6 100644
> --- a/drivers/net/ethernet/realtek/r8169_main.c
> +++ b/drivers/net/ethernet/realtek/r8169_main.c
> @@ -6952,8 +6952,12 @@ static int rtl_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
> dev->gso_max_segs = RTL_GSO_MAX_SEGS_V1;
> }
>
> - /* RTL8168e-vl has a HW issue with TSO */
> - if (tp->mac_version == RTL_GIGA_MAC_VER_34) {
> + /*
not net style comment
> + * RTL8168e-vl and one RTL8168c variant are known to have a
> + * HW issue with TSO.
> + */
> + if (tp->mac_version == RTL_GIGA_MAC_VER_34 ||
> + tp->mac_version == RTL_GIGA_MAC_VER_22) {
> dev->vlan_features &= ~(NETIF_F_ALL_TSO | NETIF_F_SG);
> dev->hw_features &= ~(NETIF_F_ALL_TSO | NETIF_F_SG);
> dev->features &= ~(NETIF_F_ALL_TSO | NETIF_F_SG);
>
^ permalink raw reply [flat|nested] 7+ messages in thread
* [PATCH net] r8169: disable TSO on a single version of RTL8168c to fix performance
2019-11-18 19:33 ` Heiner Kallweit
@ 2019-11-19 9:09 ` Corinna Vinschen
2019-11-19 18:01 ` Heiner Kallweit
2019-11-20 0:42 ` David Miller
2019-11-19 9:12 ` [PATCH net-next] " Corinna Vinschen
1 sibling, 2 replies; 7+ messages in thread
From: Corinna Vinschen @ 2019-11-19 9:09 UTC (permalink / raw)
To: netdev; +Cc: Heiner Kallweit, nic_swsd, David Miller
During performance testing, I found that one of my r8169 NICs suffered
a major performance loss, a 8168c model.
Running netperf's TCP_STREAM test didn't return the expected
throughput of > 900 Mb/s, but rather only about 22 Mb/s. Strange
enough, running the TCP_MAERTS and UDP_STREAM tests all returned with
throughput > 900 Mb/s, as did TCP_STREAM with the other r8169 NICs I can
test (either one of 8169s, 8168e, 8168f).
Bisecting turned up commit 93681cd7d94f83903cb3f0f95433d10c28a7e9a5,
"r8169: enable HW csum and TSO" as the culprit.
I added my 8168c version, RTL_GIGA_MAC_VER_22, to the code
special-casing the 8168evl as per the patch below. This fixed the
performance problem for me.
Fixes: 93681cd7d94f ("r8169: enable HW csum and TSO")
Signed-off-by: Corinna Vinschen <vinschen@redhat.com>
---
drivers/net/ethernet/realtek/r8169_main.c | 8 ++++++--
1 file changed, 6 insertions(+), 2 deletions(-)
diff --git a/drivers/net/ethernet/realtek/r8169_main.c b/drivers/net/ethernet/realtek/r8169_main.c
index d8fcdb9db8d1..1de11ac05bd6 100644
--- a/drivers/net/ethernet/realtek/r8169_main.c
+++ b/drivers/net/ethernet/realtek/r8169_main.c
@@ -6952,8 +6952,11 @@ static int rtl_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
dev->gso_max_segs = RTL_GSO_MAX_SEGS_V1;
}
- /* RTL8168e-vl has a HW issue with TSO */
- if (tp->mac_version == RTL_GIGA_MAC_VER_34) {
+ /* RTL8168e-vl and one RTL8168c variant are known to have a
+ * HW issue with TSO.
+ */
+ if (tp->mac_version == RTL_GIGA_MAC_VER_34 ||
+ tp->mac_version == RTL_GIGA_MAC_VER_22) {
dev->vlan_features &= ~(NETIF_F_ALL_TSO | NETIF_F_SG);
dev->hw_features &= ~(NETIF_F_ALL_TSO | NETIF_F_SG);
dev->features &= ~(NETIF_F_ALL_TSO | NETIF_F_SG);
--
2.20.1
^ permalink raw reply related [flat|nested] 7+ messages in thread
* Re: [PATCH net-next] r8169: disable TSO on a single version of RTL8168c to fix performance
2019-11-18 19:33 ` Heiner Kallweit
2019-11-19 9:09 ` [PATCH net] " Corinna Vinschen
@ 2019-11-19 9:12 ` Corinna Vinschen
1 sibling, 0 replies; 7+ messages in thread
From: Corinna Vinschen @ 2019-11-19 9:12 UTC (permalink / raw)
To: Heiner Kallweit; +Cc: netdev, nic_swsd, David Miller
On Nov 18 20:33, Heiner Kallweit wrote:
> On 18.11.2019 10:55, Corinna Vinschen wrote:
> > During performance testing, I found that one of my r8169 NICs suffered
> > a major performance loss, a 8168c model.
> >
> > Running netperf's TCP_STREAM test didn't return the expected
> > throughput of > 900 Mb/s, but rather only about 22 Mb/s. Strange
> > enough, running the TCP_MAERTS and UDP_STREAM tests all returned with
> > throughput > 900 Mb/s, as did TCP_STREAM with the other r8169 NICs I can
> > test (either one of 8169s, 8168e, 8168f).
> >
> > Bisecting turned up commit 93681cd7d94f83903cb3f0f95433d10c28a7e9a5,
> > "r8169: enable HW csum and TSO" as the culprit.
> >
> > I added my 8168c version, RTL_GIGA_MAC_VER_22, to the code
> > special-casing the 8168evl as per the patch below. This fixed the
> > performance problem for me.
> >
> > Fixes: 93681cd7d94f ("r8169: enable HW csum and TSO")
> > Signed-off-by: Corinna Vinschen <vinschen@redhat.com>
>
> Thanks for reporting and the fix. Just two small nits:
> - fix should be annotated "net", not "net-next"
> - comment blocks in net subsystem don't have /* on a separate line
See my v2 patch.
> Apart from that:
> Reviewed-by: Heiner Kallweit <hkallweit1@gmail.com>
>
> Out of curiosity: Did you test also with iperf3? If yes,
> do you see the same issue?
I didn't test with iperf3 originally, but I did so now. The results are
the same. 941 Mbits/sec vs. 23.3 Mbits/sec.
Thanks,
Corinna
^ permalink raw reply [flat|nested] 7+ messages in thread
* Re: [PATCH net] r8169: disable TSO on a single version of RTL8168c to fix performance
2019-11-19 9:09 ` [PATCH net] " Corinna Vinschen
@ 2019-11-19 18:01 ` Heiner Kallweit
2019-11-20 0:42 ` David Miller
1 sibling, 0 replies; 7+ messages in thread
From: Heiner Kallweit @ 2019-11-19 18:01 UTC (permalink / raw)
To: Corinna Vinschen, netdev; +Cc: nic_swsd, David Miller
On 19.11.2019 10:09, Corinna Vinschen wrote:
> During performance testing, I found that one of my r8169 NICs suffered
> a major performance loss, a 8168c model.
>
> Running netperf's TCP_STREAM test didn't return the expected
> throughput of > 900 Mb/s, but rather only about 22 Mb/s. Strange
> enough, running the TCP_MAERTS and UDP_STREAM tests all returned with
> throughput > 900 Mb/s, as did TCP_STREAM with the other r8169 NICs I can
> test (either one of 8169s, 8168e, 8168f).
>
> Bisecting turned up commit 93681cd7d94f83903cb3f0f95433d10c28a7e9a5,
> "r8169: enable HW csum and TSO" as the culprit.
>
> I added my 8168c version, RTL_GIGA_MAC_VER_22, to the code
> special-casing the 8168evl as per the patch below. This fixed the
> performance problem for me.
>
> Fixes: 93681cd7d94f ("r8169: enable HW csum and TSO")
> Signed-off-by: Corinna Vinschen <vinschen@redhat.com>
> ---
Reviewed-by: Heiner Kallweit <hkallweit1@gmail.com>
^ permalink raw reply [flat|nested] 7+ messages in thread
* Re: [PATCH net] r8169: disable TSO on a single version of RTL8168c to fix performance
2019-11-19 9:09 ` [PATCH net] " Corinna Vinschen
2019-11-19 18:01 ` Heiner Kallweit
@ 2019-11-20 0:42 ` David Miller
2019-11-20 6:49 ` Heiner Kallweit
1 sibling, 1 reply; 7+ messages in thread
From: David Miller @ 2019-11-20 0:42 UTC (permalink / raw)
To: vinschen; +Cc: netdev, hkallweit1, nic_swsd
From: Corinna Vinschen <vinschen@redhat.com>
Date: Tue, 19 Nov 2019 10:09:39 +0100
> During performance testing, I found that one of my r8169 NICs suffered
> a major performance loss, a 8168c model.
>
> Running netperf's TCP_STREAM test didn't return the expected
> throughput of > 900 Mb/s, but rather only about 22 Mb/s. Strange
> enough, running the TCP_MAERTS and UDP_STREAM tests all returned with
> throughput > 900 Mb/s, as did TCP_STREAM with the other r8169 NICs I can
> test (either one of 8169s, 8168e, 8168f).
>
> Bisecting turned up commit 93681cd7d94f83903cb3f0f95433d10c28a7e9a5,
> "r8169: enable HW csum and TSO" as the culprit.
>
> I added my 8168c version, RTL_GIGA_MAC_VER_22, to the code
> special-casing the 8168evl as per the patch below. This fixed the
> performance problem for me.
>
> Fixes: 93681cd7d94f ("r8169: enable HW csum and TSO")
> Signed-off-by: Corinna Vinschen <vinschen@redhat.com>
Applied, but it would be really nice to know why this is happening
instead of just turning it off completely.
^ permalink raw reply [flat|nested] 7+ messages in thread
* Re: [PATCH net] r8169: disable TSO on a single version of RTL8168c to fix performance
2019-11-20 0:42 ` David Miller
@ 2019-11-20 6:49 ` Heiner Kallweit
0 siblings, 0 replies; 7+ messages in thread
From: Heiner Kallweit @ 2019-11-20 6:49 UTC (permalink / raw)
To: David Miller, vinschen; +Cc: netdev, nic_swsd
On 20.11.2019 01:42, David Miller wrote:
> From: Corinna Vinschen <vinschen@redhat.com>
> Date: Tue, 19 Nov 2019 10:09:39 +0100
>
>> During performance testing, I found that one of my r8169 NICs suffered
>> a major performance loss, a 8168c model.
>>
>> Running netperf's TCP_STREAM test didn't return the expected
>> throughput of > 900 Mb/s, but rather only about 22 Mb/s. Strange
>> enough, running the TCP_MAERTS and UDP_STREAM tests all returned with
>> throughput > 900 Mb/s, as did TCP_STREAM with the other r8169 NICs I can
>> test (either one of 8169s, 8168e, 8168f).
>>
>> Bisecting turned up commit 93681cd7d94f83903cb3f0f95433d10c28a7e9a5,
>> "r8169: enable HW csum and TSO" as the culprit.
>>
>> I added my 8168c version, RTL_GIGA_MAC_VER_22, to the code
>> special-casing the 8168evl as per the patch below. This fixed the
>> performance problem for me.
>>
>> Fixes: 93681cd7d94f ("r8169: enable HW csum and TSO")
>> Signed-off-by: Corinna Vinschen <vinschen@redhat.com>
>
> Applied, but it would be really nice to know why this is happening
> instead of just turning it off completely.
>
For RTL8168e-vl Realtek confirmed a HW issue, for this RTL8168c version
supposedly it's the same as other chip versions are working fine with TSO.
^ permalink raw reply [flat|nested] 7+ messages in thread
end of thread, other threads:[~2019-11-20 6:49 UTC | newest]
Thread overview: 7+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2019-11-18 9:55 [PATCH net-next] r8169: disable TSO on a single version of RTL8168c to fix performance Corinna Vinschen
2019-11-18 19:33 ` Heiner Kallweit
2019-11-19 9:09 ` [PATCH net] " Corinna Vinschen
2019-11-19 18:01 ` Heiner Kallweit
2019-11-20 0:42 ` David Miller
2019-11-20 6:49 ` Heiner Kallweit
2019-11-19 9:12 ` [PATCH net-next] " Corinna Vinschen
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