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

[Rudi Ahlers <Rudi@xxxxxxxxxxx>]

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 2.6.32.27 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
SoftDux

Website: http://www.SoftDux.com
Technical Blog: http://Blog.SoftDux.com
Office: 087 805 9573
Cell: 082 554 7532

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