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Re: [Xen-users] HVM Disk performance

To: Henning Sprang <henning_sprang@xxxxxx>
Subject: Re: [Xen-users] HVM Disk performance
From: Karl Stevens <karl@xxxxxxxxxxxxx>
Date: Wed, 24 Jan 2007 14:17:09 -0700
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Henning Sprang wrote:
> On 1/23/07, Karl Stevens <karl@xxxxxxxxxxxxx> wrote:
>> [...]
>> We're trying to install a legacy system (RH7.2) into a VM, but have run
>> into a performance issue with disk access.  I understand from the post
>> here: http://marc.theaimsgroup.com/?l=xen-users&m=115745154318263&w=2
>> that disk access under HVM is quite slow due to the QEmu hardware
>> emulation.
>>
>> I've read paravirt drivers, and other work being done to improve
>> performance in this area, but haven't been able to track down any usable
>> code (Rusty Russel has some patches at
>> http://ozlabs.org/~rusty/paravirt/ , but it isn't immediately clear what
>> it should be applied against.)
> 
> AFAIK this is about integrating paravirtualization into the mainstream
> kernel.

Thanks for clearing that up.. looks like I was barking up the wrong tree.

> I'd be happy to hear where any docs can be found about this, as well
> for linux as for windows (where the paravirt drivers might be only
> available for xenEnterprise users?!).

Just found this link, which may help us both. :)

http://lists.xensource.com/archives/html/xen-users/2006-09/msg00579.html

Thanks again,
Karl
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