From: Avi Kivity <avi@redhat.com>
To: "Michael S. Tsirkin" <mst@redhat.com>
Cc: x86@kernel.org, kvm@vger.kernel.org,
Ingo Molnar <mingo@redhat.com>, "H. Peter Anvin" <hpa@zytor.com>,
Marcelo Tosatti <mtosatti@redhat.com>,
gleb@redhat.com, Linus Torvalds <torvalds@linux-foundation.org>,
linux-kernel@vger.kernel.org,
Thomas Gleixner <tglx@linutronix.de>
Subject: Re: [PATCHv9 0/8] kvm: eoi optimization support
Date: Mon, 25 Jun 2012 12:41:09 +0300 [thread overview]
Message-ID: <4FE83235.2000406@redhat.com> (raw)
In-Reply-To: <cover.1340554550.git.mst@robin.redhat.com>
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
prev parent reply other threads:[~2012-06-25 9:41 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-06-24 16:24 [PATCHv9 0/8] kvm: eoi optimization support Michael S. Tsirkin
2012-06-24 16:24 ` [PATCHv9 1/8] kvm: document lapic regs field Michael S. Tsirkin
2012-06-24 16:24 ` [PATCHv9 2/8] kvm: optimize ISR lookups Michael S. Tsirkin
2012-06-24 16:24 ` [PATCHv9 3/8] kvm_para: guest side for eoi avoidance Michael S. Tsirkin
2012-06-24 16:24 ` [PATCHv9 4/8] x86/bitops: note on __test_and_clear_bit atomicity Michael S. Tsirkin
2012-06-24 16:24 ` [PATCHv9 5/8] kvm: eoi msi documentation Michael S. Tsirkin
2012-06-24 16:24 ` [PATCHv9 6/8] kvm: only sync when attention bits set Michael S. Tsirkin
2012-06-24 16:25 ` [PATCHv9 7/8] kvm: rearrange injection cancelling code Michael S. Tsirkin
2012-06-24 16:25 ` [PATCHv9 8/8] kvm: host side for eoi optimization Michael S. Tsirkin
2012-06-25 9:41 ` Avi Kivity [this message]
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