On Tue, Nov 13, 2012 at 12:33:03AM +0400, Andrey Wagin wrote:

> I found that this test returns 372293 req/sec without a problematic patch
> and only 334911 req/sec with this patch. A degradation is about 10%.

Wow, that seems a little high. Are you sure?
 
> commit 1d1a79b5b94b0aa84e1e78dd9acdcffb12274848
> Author: Jacob Keller <[email protected]>
> Date:   Tue May 22 06:18:08 2012 +0000
> 
>     ixgbe: Check PTP Rx timestamps via BPF filter

This is a git commit...

> Ask me, if you will need more information. Sorry, if it is a wrong alarm.

... but what two kernels did you test, exactly?

Anyhow, unless you have enabled PTP time stamping, it is hard to see
how that patch could cause such a large performance hit.

Thanks,
Richard

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