netdev - Re: Low performance Intel 10GE NIC (3.2.10) on 2.6.38 Kernel

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Message-ID: <BANLkTin_OgBo3N8qi5cF5rOd__pRKifwsg@mail.gmail.com>
Date:	Mon, 18 Apr 2011 14:12:27 -0700
From:	Jesse Brandeburg <jesse.brandeburg@...il.com>
To:	Wei Gu <wei.gu@...csson.com>
Cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Eric Dumazet <eric.dumazet@...il.com>,
	Alexander Duyck <alexander.h.duyck@...el.com>,
	netdev <netdev@...r.kernel.org>,
	"Kirsher, Jeffrey T" <jeffrey.t.kirsher@...el.com>,
	Mike Galbraith <efault@....de>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: Low performance Intel 10GE NIC (3.2.10) on 2.6.38 Kernel

On Fri, Apr 15, 2011 at 2:14 AM, Wei Gu <wei.gu@...csson.com> wrote:
> Is there something that I can provide in order to identify the problem?

for power state concerns you may want to try running turbostat
(available in recent kernels, runs also on older kernels) during the
workload in question.  Capture the results via something like:
cd /home/jbrandeb/linux-2.6.38.2/tools/power/x86/turbostat
make
for i in `seq 1 10` ; do ./turbostat -v sleep 5 >> turbostat.txt 2>&1 ; done

Jesse
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