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Re: [Xen-users] Bad TCP accept performance

To: Pasi Kärkkäinen <pasik@xxxxxx>
Subject: Re: [Xen-users] Bad TCP accept performance
From: Carl Byström <cgbystrom@xxxxxxxxx>
Date: Tue, 24 May 2011 23:46:17 +0200
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On Mon, May 23, 2011 at 10:22 PM, Pasi Kärkkäinen <pasik@xxxxxx> wrote:

- Did you try giving dom0 and the VM dedicated cpu cores? Did that help?
 (See http://wiki.xen.org/xenwiki/XenBestPractices)

- Can you use Xen PCI passthru to dedicate a physical NIC to the VM ?

I haven't tried that, no. The dom0 is hosting other infrastructural servers so will need to get hold of our sysadmin to help me with this. Will get back to you.

- Can you post your benchmark numbers.. we need more info so we know
 what kind of numbers are we talking about. Also post the specs
 of your hardware and also full software/kernel/xen versions.

I maintain a list of benchmark numbers at https://gist.github.com/985475
Submitted by myself and other users. It includes OS versions but not Xen version, will try to find out.
Also tried this on EC2 with discouraging results as well.

Russ, I tried this using only local loopback ( to minimize any external factors. Does that make a difference to what you were suggesting?

Appreciate any help I can get on this.

Carl Byström
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