RE: [PATCH V2,net] net: mana: Fix perf regression: remove rx_cqes, tx_cqes counters

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> -----Original Message-----
> From: Jakub Kicinski <kuba@xxxxxxxxxx>
> Sent: Thursday, May 25, 2023 11:26 PM
> To: Haiyang Zhang <haiyangz@xxxxxxxxxxxxx>
> Cc: linux-hyperv@xxxxxxxxxxxxxxx; netdev@xxxxxxxxxxxxxxx; Dexuan Cui
> <decui@xxxxxxxxxxxxx>; KY Srinivasan <kys@xxxxxxxxxxxxx>; Paul Rosswurm
> <paulros@xxxxxxxxxxxxx>; olaf@xxxxxxxxx; vkuznets@xxxxxxxxxx;
> davem@xxxxxxxxxxxxx; wei.liu@xxxxxxxxxx; edumazet@xxxxxxxxxx;
> pabeni@xxxxxxxxxx; leon@xxxxxxxxxx; Long Li <longli@xxxxxxxxxxxxx>;
> ssengar@xxxxxxxxxxxxxxxxxxx; linux-rdma@xxxxxxxxxxxxxxx;
> daniel@xxxxxxxxxxxxx; john.fastabend@xxxxxxxxx; bpf@xxxxxxxxxxxxxxx;
> ast@xxxxxxxxxx; Ajay Sharma <sharmaajay@xxxxxxxxxxxxx>;
> hawk@xxxxxxxxxx; tglx@xxxxxxxxxxxxx; shradhagupta@xxxxxxxxxxxxxxxxxxx;
> linux-kernel@xxxxxxxxxxxxxxx; stable@xxxxxxxxxxxxxxx
> Subject: Re: [PATCH V2,net] net: mana: Fix perf regression: remove rx_cqes,
> tx_cqes counters
> 
> On Thu, 25 May 2023 07:46:30 -0700 Haiyang Zhang wrote:
> > lot caching and memory overhead, hence perf regression.
> 
> Horatiu's ask for more details was perfectly reasonable.
> Provide more details to give the distros and users an
> idea of the order of magnitude of the problem. Example
> workload and relative perf hit, anything.

For example, a workload is iperf with 128 threads, and with RPS enabled.
We saw perf regression of 25% with the previous patch adding the counters.
And this patch eliminates the regression. 

Thanks,
- Haiyang





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