[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

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

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 dom0 from git.

Don't use file:.
- 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)


Xen-users mailing list



Lists.xenproject.org is hosted with RackSpace, monitoring our
servers 24x7x365 and backed by RackSpace's Fanatical Support®.