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Message-ID: <OS3P286MB22951D8802775CC6DBF243F3F5A49@OS3P286MB2295.JPNP286.PROD.OUTLOOK.COM>
Date: Mon, 20 Feb 2023 11:44:08 +0800
From: Eddy Tao <taoyuan_eddy@...mail.com>
To: Simon Horman <simon.horman@...igine.com>
Cc: dev@...nvswitch.org, netdev@...r.kernel.org,
linux-kernel@...r.kernel.org, Eric Dumazet <edumazet@...gle.com>,
Jakub Kicinski <kuba@...nel.org>,
Paolo Abeni <pabeni@...hat.com>,
"David S. Miller" <davem@...emloft.net>
Subject: Re: [ovs-dev] [PATCH net-next v1 1/1] net: openvswitch:
ovs_packet_cmd_execute put sw_flow mainbody in stack
More explanation to the meaning of performance data
>>Mode Iterations Variance Average
Iterations: the number of executions of the same test case (each
iteration get a performance value of perf[n] )
Average: sum of all execution and then divided by 'n_iterations'. Below
is the pseudo code
for (sum=0,i=0;i<iterations;i++) sum+= perf[i];
average = sum/iterations
Variance: A percentage value describing the overall deviation of
performance results from average. Below is the pseudo code
for (deviation=0,i=0;i<iterations;i++) deviation+=
square(perf[i] - average);
variance = ((square_root(deviation/iterations)) *
100)/average
On 2023/2/20 11:04, Eddy Tao wrote:
> Hi, Simon:
>
> To have better visibility of the effect of the patch, i did
> another test below
>
> Disabling data-path flow installation to steer traffic to slow path
> only, thus I can observe the performance on slow path, where
> ovs_packet_cmd_execute is extensively used
>
>
> Testing topology
>
> |-----|
> nic1--| |--nic1
> nic2--| |--nic2
> VM1(16cpus) | ovs | VM2(16 cpus)
> nic3--| |--nic3
> nic4--| |--nic4
> |-----|
> 2 netperf client threads on each vnic
>
> netperf -H $peer -p $((port+$i)) -t TCP_STREAM -l 60
> netperf -H $peer -p $((port+$i)) -t TCP_RR -l 60 -- -R 1 -r 120,240
> netperf -H $peer -p $((port+$i)) -t TCP_CRR -l 60 -- -R 1 -r 120,240
>
> Mode Iterations Variance Average
>
> TCP_STREAM 10 %3.83 1433 ==> before the change
> TCP_STREAM 10 %3.39 1504 ==> after the change
>
> TCP_RR 10 %2.35 45145 ==> before the change
> TCP_RR 10 %1.06 47250 ==> after the change
>
> TCP_CRR 10 %0.54 11310 ==> before the change
> TCP_CRR 10 %2.64 12741 ==> after the change
>
>
> Considering the size and simplicity of the patch, i would say the
> performance benefit is decent.
>
> Thanks
>
> eddy
>
>
> _______________________________________________
> dev mailing list
> dev@...nvswitch.org
> https://mail.openvswitch.org/mailman/listinfo/ovs-dev
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