Re: [Xen-devel] windows domU disk performance graph comparing hvm vs stubdom vs pv drivers

[Keith Coleman <list.keith@xxxxxxxxxxx>]

On 2/22/10, Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx> wrote:
> On Fri, 19 Feb 2010, Keith Coleman wrote:
>> I am posting this to xen-devel instead of -users because it paints an
>> incomplete picture that shouldn't be the basis for deciding how to run
>> production systems.
>>
>> This graph shows the performance under a webserver disk IO workload at
>> different queue depths. It compares the 4 main IO methods for windows
>> guests that will be available in the upcoming xen 4.0.0 and 3.4.3
>> releases: pure HVM, stub domains, gplpv drivers, and xcp winpv
>> drivers.
>>
>> The gplpv and xcp winpv drivers have comparable performance with gplpv
>> being slightly faster. Both pv drivers are considerably faster than
>> pure hvm or stub domains. Stub domain performance was about even with
>> HVM which is lower than we were expecting. We tried a different cpu
>> pinning in "Stubdom B" with little impact.
>>
>
> What disk backend are you using?

phy, LV


Keith Coleman

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