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Re: [Xen-users] Writing fast in domU crashes entire xen system

To: moncojhr <moncojhr@xxxxxxxxx>
Subject: Re: [Xen-users] Writing fast in domU crashes entire xen system
From: Rudi Ahlers <Rudi@xxxxxxxxxxx>
Date: Fri, 18 Feb 2011 13:06:02 +0200
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On Fri, Feb 18, 2011 at 12:58 PM, moncojhr <moncojhr@xxxxxxxxx> wrote:
> Having a problem here where, if I write quickly in a domU, dom0
> freezes up and I cant do anything but reboot, you can still type, just
> nothing will ever do anything.
> I noticed that I am able to get much faster speeds writing in the domU
> then in dom0:
> dom0: 1073741824 bytes (1.1 GB) copied, 27.3189 s, 39.3 MB/s
> domU: 1073741824 bytes (1.1 GB) copied, 6.80832 s, 158 MB/s
> I do not get the freeze/lockup when writing in dom0, only when writing
> quickly a lot of data in domU.
> I am using file: for my vm's , using the dom0 from git.
> Any help would be great!
> _______________________________________________

It sounds like your domU doesn't have enough RAM  so it has to use a
lot of swap, which causes an I/O overload problem.

Assign more RAM to the domU and see if it helps.

Kind Regards
Rudi Ahlers

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