From mboxrd@z Thu Jan 1 00:00:00 1970 From: arno@natisbad.org (Arnaud Ebalard) Subject: Re: [BUG,REGRESSION?] 3.11.6+,3.12: GbE iface rate drops to few KB/s Date: Wed, 20 Nov 2013 20:22:31 +0100 Message-ID: <87bo1eq3ns.fsf@natisbad.org> References: <20131112083633.GB10318@1wt.eu> <87a9hagex1.fsf@natisbad.org> <20131112100126.GB23981@1wt.eu> <87vbzxd473.fsf@natisbad.org> <20131113072257.GB10591@1wt.eu> <20131117141940.GA18569@1wt.eu> <1384710098.8604.58.camel@edumazet-glaptop2.roam.corp.google.com> <20131120171227.GG8581@1wt.eu> <20131120173436.GK8581@1wt.eu> <1384969222.10637.20.camel@edumazet-glaptop2.roam.corp.google.com> <20131120181532.GM8581@1wt.eu> Mime-Version: 1.0 Content-Type: text/plain Cc: Eric Dumazet , Thomas Petazzoni , netdev@vger.kernel.org, edumazet@google.com, Cong Wang , linux-arm-kernel@lists.infradead.org To: Willy Tarreau Return-path: Received: from smtp5-g21.free.fr ([212.27.42.5]:46957 "EHLO smtp5-g21.free.fr" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754193Ab3KTTW5 (ORCPT ); Wed, 20 Nov 2013 14:22:57 -0500 Received: from smtp.natisbad.org (unknown [IPv6:2a01:e35:139b:9f90:221:70ff:fe55:8f78]) by smtp5-g21.free.fr (Postfix) with ESMTP id 31621D48261 for ; Wed, 20 Nov 2013 20:22:41 +0100 (CET) Sender: netdev-owner@vger.kernel.org List-ID: Hi, Willy Tarreau writes: > On Wed, Nov 20, 2013 at 09:40:22AM -0800, Eric Dumazet wrote: >> On Wed, 2013-11-20 at 18:34 +0100, Willy Tarreau wrote: >> >> > One important point, I was looking for the other patch you pointed >> > in this long thread and finally found it : >> > >> > > So >> > > http://git.kernel.org/cgit/linux/kernel/git/davem/net.git/commit/?id=98e09386c0ef4dfd48af7ba60ff908f0d525cdee >> > > >> > > restored this minimal amount of buffering, and let the bigger amount for >> > > 40Gb NICs ;) >> > >> > This one definitely restores original performance, so it's a much better >> > bet in my opinion :-) >> >> I don't understand. I thought you were using this patch. > > No, I was on latest stable (3.10.19) which exhibits the regression but does > not yet have your fix above. Then I tested the patch your proposed in this > thread, then this latest one. Since the patch is not yet even in Linus' > tree, I'm not sure Arnaud has tried it yet. This is the one I have used for a week now, since its publication by Eric a week ago: http://www.spinics.net/lists/netdev/msg257396.html Cheers, a+