Re: [Xen-devel] Re: Poor performance on HVM (kernbench)

[Gianluca Guida <gianluca.guida@xxxxxxxxxxxxx>]

Todd Deshane wrote:
> Xen 3.3 should be an improvement with shadow3 right?
As other people already said, shadow3 (especially the current unsync 
policy) was mostly developed with Windows performance in mind. I would 
be surprised if the shadow algorithm is causing such a performance loss 
though; but in any case, you can disable the out-of-sync feature by 
removing SHOPT_OUT_OF_SYNC from SHADOW_OPTIMIZATIONS in 
xen/arch/x86/mm/shadows/private.h (setting it to 0xff instead of 0x1ff), 
reverting the shadow code back to shadow 2 again.
Can you please test that and see if it makes any difference?

Thanks,
Gianluca

> Should I need to adjust the shadow_memory parameter for the guest?
>
> I'm going to try Xen 3.2.1 from source next.
>
> Todd
>
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