netdev - Re: [BUG,REGRESSION?] 3.11.6+,3.12: GbE iface rate drops to few KB/s

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20131120181532.GM8581@1wt.eu>
Date:	Wed, 20 Nov 2013 19:15:32 +0100
From:	Willy Tarreau <w@....eu>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>,
	netdev@...r.kernel.org, Arnaud Ebalard <arno@...isbad.org>,
	edumazet@...gle.com, Cong Wang <xiyou.wangcong@...il.com>,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [BUG,REGRESSION?] 3.11.6+,3.12: GbE iface rate drops to few KB/s

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.

> I guess we are spending time on a already solved problem.

That's possible indeed. Sorry if I was not clear enough, I tried.

Regards,
Willy

--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html