netdev - Re: significant napi_gro

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Message-ID: <1395940898.12610.307.camel@edumazet-glaptop2.roam.corp.google.com>
Date:	Thu, 27 Mar 2014 10:21:38 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Michal Schmidt <mschmidt@...hat.com>
Cc:	netdev@...r.kernel.org, Jerry Chu <hkchu@...gle.com>,
	Eric Dumazet <edumazet@...gle.com>,
	"David S. Miller" <davem@...emloft.net>
Subject: Re: significant napi_gro_frags() slowdown

On Thu, 2014-03-27 at 18:05 +0100, Michal Schmidt wrote:
> Dne 27.3.2014 17:47, Eric Dumazet napsal:
> > On Thu, 2014-03-27 at 17:39 +0100, Michal Schmidt wrote:
> >> I received a report about a performance regression on a simple workload
> >> of receiving a single TCP stream using a be2net NIC. Previously the
> >> reporter was able to reach more than 9 Gb/s, but now he sees less than 7
> >> Gb/s.
> >
> > Yeah, we are aware of this, and we had some discussions, but not yet got
> > a fix.
> >
> > Are you running a 64 or 32bit kernel BTW ?
> 
> Both my reporter and I are running 64bit kernels.

OK I'll cook a patch asap, thanks for the heads up ;) 


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