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

["James Harper" <james.harper@xxxxxxxxxxxxxxxx>]

Gplpv has supported all disks pv since the beginning. Recent versions turn off 
pv for the CDROM as qemu is more flexible (real CDROM works properly etc) but I 
think only under xen 3.4.1 or newer

Sent from my iPhone

On 12/10/2010, at 19:48, "Keir Fraser" <keir@xxxxxxx> wrote:

> 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
> 
> 

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