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

["Fajar A. Nugraha" <list@xxxxxxxxx>]

On Fri, Feb 18, 2011 at 5:58 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

That's because dom0 is buffering the writes.

>
> 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.

Don't use file:.
Use:
- tap2:tapdisk:aio: (if you're using Xen >= 4.0.1)
- tap:tapdisk:aio: (if you're using Xen = 4.0.0)
- tap:aio (anything older than 4.0.0)

-- 
Fajar

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