From mboxrd@z Thu Jan  1 00:00:00 1970
From: Andrew Theurer <habanero@us.ibm.com>
Subject: Re: Much difference between netperf results on every run
Date: Thu, 19 Oct 2006 13:56:46 -0500
Message-ID: <4537CA6E.8000504@us.ibm.com>
References: <45343EAF.3000800@jp.fujitsu.com>
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To: INAKOSHI Hiroya <inakoshi.hiroya@jp.fujitsu.com>
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INAKOSHI Hiroya wrote:
> Hi all,
>
> the throughput measured by netperf differs from time to time. The
> changeset was xen-unstable.hg C/S 11760. This is observed when I
> executed a netperf on DomU connecting to a netserver on Dom0 in the
> same box. The observed throughput was between 185Mbps to 3854Mbps. I
> have never seen such a difference on ia64.
>
> Regards,
> Hiroya

I am also seeing this, but with not as much variability. Actually I am
seeing significantly less throughput (1/6th) for dom0->domU then
domU->dom0, and for dom0->domU, I am seeing +/- 15% variability. I am
looking in to it, but so far I have not discovered anything.

So you know what cpus the domU and dom0 are using? You might try pinning the
domains to cpus and see what happens.

-Andrew
~