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Re: [Xen-devel] XCP: dom0 scalability

To: Tim Deegan <Tim.Deegan@xxxxxxxxxx>
Subject: Re: [Xen-devel] XCP: dom0 scalability
From: Jeremy Fitzhardinge <jeremy@xxxxxxxx>
Date: Wed, 13 Oct 2010 09:12:18 -0700
Cc: Dan Magenheimer <dan.magenheimer@xxxxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx>, Dave Scott <Dave.Scott@xxxxxxxxxxxxx>, "xen-api@xxxxxxxxxxxxxxxxxxx" <xen-api@xxxxxxxxxxxxxxxxxxx>
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 On 10/13/2010 09:07 AM, Tim Deegan wrote:
> At 16:46 +0100 on 13 Oct (1286988381), Dan Magenheimer wrote:
>> Hmmm... if dom0 is getting scheduled enough and the VMs are still
>> blocking on xenstore (i.e. the Linux scheduler in dom0 is the problem),
>> getting xenstore off of dom0 makes sense.  But if the reason xenstore
>> is not getting back to them is because dom0 is simply not getting
>> enough cpu time (i.e. the Xen scheduler is the problem), moving xenstore
>> out of there may not only NOT help, but may make things worse.  True?
> The reason that dom0's not getting enough time in this case is that it's
> running with only 1 vcpu and trying to do more than 1 vcpu worth of
> work.  I'd expect things to get very slightly better if some of that
> work can happen on another vpcu (in another dom).

Or just make dom0 multi-vcpu?

    J

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