linux-kernel - Re: [PATCHv9 0/8] kvm: eoi optimization support

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Message-ID: <4FE83235.2000406@redhat.com>
Date:	Mon, 25 Jun 2012 12:41:09 +0300
From:	Avi Kivity <avi@...hat.com>
To:	"Michael S. Tsirkin" <mst@...hat.com>
CC:	x86@...nel.org, kvm@...r.kernel.org,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Marcelo Tosatti <mtosatti@...hat.com>, gleb@...hat.com,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCHv9 0/8] kvm: eoi optimization support

On 06/24/2012 07:24 PM, Michael S. Tsirkin wrote:
> I'm looking at reducing the interrupt overhead for virtualized guests:
> some workloads spend a large part of their time processing interrupts.
> 
> On kvm, an EOI write from the guest causes an expensive exit to host; we
> avoid this using shared memory.
> 
> The patches work fine on my boxes. See individual patches
> for perf tests. You need to patch qemu to whitelist the kvm feature.
> qemu patch was sent separately.
> 
> The patches are against Linus's master and apply to kvm.git
> cleanly.  The last patch in the series, supplying the host
> part, also depends on the ISR optimization patch that I
> have for convenience included in the series (patch 2),
> I also included a documentation patch (patch 1) - it is
> here since it clarifies patch 2.  This revision does not yet address
> Thomas's idea of reworking the APIC page handling.  Changes to this
> optimization would require reworking this last patch in the series.
> 
> The rest of the patchset has not changed significantly since v2.

Thanks, applied.


-- 
error compiling committee.c: too many arguments to function


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