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

To: Keir Fraser <keir@xxxxxxxxxxxxx>
Subject: Re: [Xen-devel] Re: [Xen-users] Re: Xen 3.1 released!
From: Tomasz Chmielewski <mangoo@xxxxxxxx>
Date: Fri, 25 May 2007 15:20:05 +0200
Cc: "Petersson, Mats" <Mats.Petersson@xxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxx, xen-users@xxxxxxxxxxxxxxxxxxx
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Keir Fraser schrieb:

On 25/5/07 13:57, "Tomasz Chmielewski" <mangoo@xxxxxxxx> wrote:

I inspected the logs, and it was the OOM-killer. Should it ever happen
when saving a guest domain? Xen host has 256 MB RAM for dom0 (3 GB
total), Xen guest 1.7 GB.
It appears that saving of HVM somains needs more memory: in this
particular case, when I increased memory for dom0, about 350 MB RAM was
used in total during the domain save.
That's kind of surprising, but I guess totally plausible if you don't
configure a swap partition for dom0?
No - dom0 has a 2 GB swap partition.

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

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).

Tomasz Chmielewski

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