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Re: [Xen-users] ways to help improve network performance

from [Pasi Kärkkäinen]

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To:	Shaun <mailinglists@xxxxxxxxxxxxxxxx>
Subject:	Re: [Xen-users] ways to help improve network performance
From:	Pasi Kärkkäinen <pasik@xxxxxx>
Date:	Thu, 1 Jun 2006 13:28:21 +0300
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On Thu, Jun 01, 2006 at 02:21:27AM -0700, Shaun wrote:
> I'm looking for any bit of info that any of you may have to help improve 
> performance to Dom0/U's.  Performance is fine as long as the host doesnt 
> have much going on but if you have a few domU's eating a good amount of 
> resources it will cause the latency to go up.  Right now i'm seeing a 
> 30-60ms increase in latency. Host is a Dual Xeon with HT disabled.  Dom0 is 
> assigned both cpu's while domU's are given 1 cpu and distributed evenly 
> between cpu 0 and 1.
>

I did these steps to improve network performance with xen 3:

1. Assigned one CPU (hyperthread) _only_ for dom0
2. Changed the (default) xen scheduler to BVT
3. Changed the default linux io elevators from anticipatory -> cfq

-- Pasi

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