From: "Zhang, Yanmin" <yanmin_zhang@linux.intel.com>
To: Christoph Lameter <cl@linux-foundation.org>
Cc: netdev@vger.kernel.org, lkml <linux-kernel@vger.kernel.org>
Subject: Re: tbench regression on each kernel release from 2.6.22 -> 2.6.28
Date: Mon, 18 Aug 2008 09:48:32 +0800 [thread overview]
Message-ID: <1219024112.25608.321.camel@ymzhang> (raw)
In-Reply-To: <48A086B6.2000901@linux-foundation.org>
On Mon, 2008-08-11 at 13:36 -0500, Christoph Lameter wrote:
> It seems that the network stack becomes slower over time? Here is a list of
> tbench results with various kernel versions:
>
> 2.6.22 3207.77 mb/sec
> 2.6.24 3185.66
> 2.6.25 2848.83
> 2.6.26 2706.09
> 2.6.27(rc2) 2571.03
What's the hardware configuration? Is it dual-core?
I also track tbench performance with lastest kernels on a couple of quad-core machines,
and didn't find such regression while the results did have fluctuation.
What's the commandline you is using to start tbench? I start tbench with CPU_NUM*2.
BTW, I enabled CONFIG_SLUB since 2.6.22.
>
> And linux-next is:
>
> 2.6.28(l-next) 2568.74
>
> It shows that there is still have work to be done on linux-next. Too close to
> upstream in performance.
>
> Note the KT event between 2.6.24 and 2.6.25. Why is that?
prev parent reply other threads:[~2008-08-18 1:49 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-08-11 18:36 tbench regression on each kernel release from 2.6.22 -> 2.6.28 Christoph Lameter
2008-08-11 18:50 ` Kok, Auke
2008-08-11 18:56 ` Christoph Lameter
2008-08-11 21:15 ` David Miller
2008-08-11 21:33 ` Christoph Lameter
2008-08-11 21:50 ` David Miller
2008-08-11 21:56 ` Kok, Auke
2008-08-11 22:11 ` Rick Jones
2008-08-12 7:11 ` Andi Kleen
2008-08-12 18:57 ` Christoph Lameter
2008-08-12 8:13 ` Ilpo Järvinen
2008-08-18 2:05 ` Zhang, Yanmin
2008-08-18 7:53 ` Ilpo Järvinen
2008-08-19 0:56 ` Zhang, Yanmin
2008-08-18 14:07 ` Christoph Lameter
2008-08-18 14:31 ` Ray Lee
2008-08-18 14:34 ` Christoph Lameter
2008-08-19 1:01 ` Zhang, Yanmin
2008-08-18 1:48 ` Zhang, Yanmin [this message]
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