netdev - Re: [PATCH RFC net-next] vxlan: GRO support at tunnel layer

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Date:	Sun, 28 Jun 2015 10:20:40 -0700
From:	Ramu Ramamurthy <sramamur@...ux.vnet.ibm.com>
To:	Rick Jones <rick.jones2@...com>
Cc:	Tom Herbert <tom@...bertland.com>, davem@...emloft.net,
	netdev@...r.kernel.org
Subject: Re: [PATCH RFC net-next] vxlan: GRO support at tunnel layer

On 2015-06-26 17:46, Rick Jones wrote:
> On 06/26/2015 04:09 PM, Tom Herbert wrote:
>> Add calls to gro_cells infrastructure to do GRO when receiving on a 
>> tunnel.
>> 
>> Testing:
>> 
>> Ran 200 netperf TCP_STREAM instance
>> 
>> - With fix (GRO enabled on VXLAN interface)
>> 
>>    Verify GRO is happening.
>> 
>>    9084 MBps tput
>>    3.44% CPU utilization
>> 
>> - Without fix (GRO disabled on VXLAN interface)
>> 
>>    Verified no GRO is happening.
>> 
>>    9084 MBps tput
>>    5.54% CPU utilization
> 
> This has been an area of interest so:
> 
> Tested-by: Rick Jones <rick.jones2@...com>
> 
> Some single-stream results between two otherwise identical systems
> with 82599ES NICs in them, one running a 4.1.0-rc1+ kernel from a
> davem tree from a while ago, the other running 4.1.0+ from a davem
> tree pulled yesterday upon which I've applied the patch.
> 
> Netperf command used:
> 
> netperf -l 30 -H <IP> -t TCP_MAERTS -c -- -O
> throughput,local_cpu_util,local_cpu_peak_util,local_cpu_peak_id,local_sd
> 
> First, inbound to the unpatched system from the patched:
> 
> 
> MIGRATED TCP MAERTS TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET to
> 192.168.0.21 () port 0 AF_INET : demo
> Throughput Local Local   Local   Local
>            CPU   Peak    Peak    Service
>            Util  Per CPU Per CPU Demand
>            %     Util %  ID
> 5487.42    6.01  99.83   0       2.872
> 5580.83    6.20  99.16   0       2.911
> 5445.52    5.68  98.92   0       2.734
> 5653.36    6.24  99.80   0       2.891
> 5187.56    5.66  97.41   0       2.858
> 
> Second, inbound to the patched system from the unpatched:
> 
> MIGRATED TCP MAERTS TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET to
> 192.168.0.22 () port 0 AF_INET : demo
> Throughput Local Local   Local   Local
>            CPU   Peak    Peak    Service
>            Util  Per CPU Per CPU Demand
>            %     Util %  ID
> 6933.29    3.19  93.67   3       1.208
> 7031.35    3.34  95.08   3       1.244
> 7006.28    3.27  94.55   3       1.223
> 6948.62    3.09  93.20   3       1.165
> 7007.80    3.22  94.34   3       1.206
> 
> Comparing the service demands shows a > 50% reduction in overhead.

Rick, in your test, are you seeing gro becoming effective on the vxlan 
interface
with the 82599ES nic ? (ie, tcpdump on the vxlan interface shows larger 
frames
than the mtu of that interface, and kernel trace shows 
vxlan_gro_receive() being hit)

Throughputs of 5.5 Gbps (or the improved 7Gbs) leads me to suspect that 
gro is still not effective
in your test on the vxlan interface with the 82588ES nic - Because, when 
vxlan gro became effective with the patch
I suggested earlier, I could see throughput of ~8.5 Gbps on that nic.


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