Re: [Xen-devel] Reducing I/O introduced domain scheduling

[Keir Fraser <keir@xxxxxxx>]

On 12/10/2010 08:19, "Dong, Eddie" <eddie.dong@xxxxxxxxx> wrote:

>> First of all have you tested with PV drivers? Performance tests with
>> no PV drivers are not that interesting.
> 
> We used PV driver as more as possible, however the C disk in Windows guest
> doesn't support PV yet. (A task in BIOS side or Win HAL side?)

Running the system disk in PV mode certainly works okay with the Citrix PV
drivers. Might this simply be a current limitation of the GPLPV drivers? If
so, I definitely think you are better off putting effort into removing that
limitation, rather than implementing your proposed optimisation. You will
definitely get a bigger perf boost that way, and no suspicious hypervisor
hacks needed.

Cc'ing James Harper, who will best know what the current GPLPV drivers
can/can't do. Also Paul Durrant, who can likely help with advice on how to
PV up the Windows system disk.

 -- Keir



_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-devel