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Re: [Xen-devel] Re: [Xen-users] Re: Xen 3.1 released!

To: Tomasz Chmielewski <mangoo@xxxxxxxx>
Subject: Re: [Xen-devel] Re: [Xen-users] Re: Xen 3.1 released!
From: Keir Fraser <keir@xxxxxxxxxxxxx>
Date: Fri, 25 May 2007 14:38:21 +0100
Cc: "Petersson, Mats" <Mats.Petersson@xxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxx, xen-users@xxxxxxxxxxxxxxxxxxx
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On 25/5/07 14:20, "Tomasz Chmielewski" <mangoo@xxxxxxxx> wrote:

>> Hmmm... That's not so explicable. Obviously something in save/restore is
>> causing unpageable allocations to happen. Could be pagetables for mappings
>> of HVM guest memory, or something like that. Needs investigating further, I
>> think.
> Could be.
> Now that I repeated the save/restore a couple of times, total RAM usage
> for dom0 jumps to ~700 MB sometimes during domain save (dom0 has now
> about 2.3 GB RAM, domU has 1.7 GB RAM; 4 GB RAM installed now in the
> machine).

The only thing I would expect could so dramatically inflate dom0's memory
usage would be caching of disc blocks from the saved image file. But we
added explicit cache flushing to both domain-save and domain-restore before
releasing 3.1. The flushes are only advisory though, so perhaps they are
getting ignored for some reason.

 -- Keir

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