Re: [PATCH 0 of 6] PowerPC KVM patches for 2.6.29

[Avi Kivity <avi@redhat.com>]

Hollis Blanchard wrote:
> Hi Avi, here's the latest batch of PowerPC kernel patches.
>
> The first set dramatically improve performance. Most importantly, we add
> support for large host pages with KVM (i.e. PAGE_SHIFT > 12). (Large *guest*
> pages have already been supported since day 1, since the guest kernel uses
> them for the linear map.) Followup patches further improve performance by
> changing how we manage the shadow TLB.
>
> The last two add some accounting code to easily discover performance
> bottlenecks. This is especially important since the 440 core lacks performance
> monitoring hardware.
>
> These patches, in conjunction with 64KB pages on guest and host, get us to 96%
> of native performance for compute-bound workloads, which I'm pretty happy
> with. See http://kvm.qumranet.com/kvmwiki/PowerPC_Exittimings for more
> details (those statistics were gathered using the accounting patches).
>
> These have been tested pretty thoroughly for several weeks. Please apply for
> 2.6.29. Thanks!
>   

Applied all, thanks.

I'm not thrilled about the private exit timing statistics gathering, 
hopefully it can be morphed into the more general framework.

-- 
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