From: "Alex,Shi" <alex.shi@intel.com>
To: David Miller <davem@davemloft.net>
Cc: eric.dumazet@gmail.com, linux-kernel@vger.kernel.org,
tim.c.chen@intel.com, ying.huang@intel.com,
netdev@vger.kernel.org
Subject: Re: TCP_STREAM performance regression on commit b3613118
Date: Mon, 20 Feb 2012 09:44:13 +0800 [thread overview]
Message-ID: <1329702253.14084.22.camel@debian> (raw)
In-Reply-To: <20120217.133327.1178765872497293871.davem@davemloft.net>
On Fri, 2012-02-17 at 13:33 -0500, David Miller wrote:
> From: Eric Dumazet <eric.dumazet@gmail.com>
> Date: Fri, 17 Feb 2012 10:50:39 +0100
>
> > Le vendredi 17 février 2012 à 16:18 +0800, Alex,Shi a écrit :
> >> The tcp_stream loop back performance has about 10% drop on the
> >> commitment on our core2 2 sockets server. This commit has 2
> >> parents(7505afe28, 5983fe), but both of them have no regression. So
> >> guess the impact just happened when this 2 parents joint. That beyond
> >> our capability to dig it more.
> >>
> >> Any ideas?
> >
> > Most probably the more accurate truesize determination is responsible of
> > this tcp regression, since some prior assumptions might be wrong.
> >
> > Want to give more information on the workload ?
> > Is it a 32 or 64 bit kernel ?
It is 64 bit kernel. Currently we only care 64bit.
Will try to bring more statistic after our lab recovered.
>
> And let's start CC:'ing netdev too.
next prev parent reply other threads:[~2012-02-20 1:46 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-02-17 8:18 TCP_STREAM performance regression on commit b3613118 Alex,Shi
2012-02-17 9:50 ` Eric Dumazet
2012-02-17 18:33 ` David Miller
2012-02-20 1:44 ` Alex,Shi [this message]
2012-03-02 2:45 ` Alex Shi
2012-03-02 3:07 ` David Miller
2012-03-02 6:37 ` Alex Shi
2012-03-02 12:28 ` Eric Dumazet
2012-03-06 8:11 ` Feng Tang
2012-03-06 8:26 ` Jason Wang
2012-03-06 12:01 ` Eric Dumazet
2012-03-07 2:55 ` Feng Tang
2012-03-06 18:23 ` Rick Jones
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