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Re: Re: Re: AW: Re: [Xen-devel] AW: Load increase after memory upgrade?

To: Carsten Schiers <carsten@xxxxxxxxxx>
Subject: Re: Re: Re: AW: Re: [Xen-devel] AW: Load increase after memory upgrade?
From: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
Date: Tue, 28 Jun 2011 16:34:21 -0400
Cc: linux <linux@xxxxxxxxxxxxxx>, xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxx>
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On Tue, Jun 28, 2011 at 10:22:34PM +0200, Carsten Schiers wrote:
> >a). What is the version of Dom0? Are you swapping that out? If so, and 
> you
> >want the latests then the next step is to do:
> Dom0 is jeremy's git xen/stable-2.6.32.x in 64 Bit. DomUs are 32 Bit. 
> Shall I 
> experimently change that to what you recommended?

Lets first do the c) experiment as that will likely explain your load average 

> >c). If you want to see if the fault here lies in the bounce buffer 
> being used more
> >often in the DomU b/c you have 8GB of memory now and you end up using 
> more pages
> >past 4GB (in DomU), I can cook up a patch to figure this out. But an 
> easier way is
> >to just do (on the Xen hypervisor line): mem=4G and that will make 
> think you only have
> >4GB of physical RAM.  If the load comes back to the normal "amount" 
> then the likely
> >culprit is that and we can think on how to fix this.
> So I will reboot with the a.m. parameter, but that's not possible right 
> now. I 
> will keep you informed. Eventually I can combine that with the test a) 
> on Thursday.
> Carsten.

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