From: Rusty Russell <rusty@rustcorp.com.au>
To: Avi Kivity <avi@qumranet.com>
Cc: Mark McLoughlin <markmc@redhat.com>,
kvm@vger.kernel.org, Herbert Xu <herbert@gondor.apana.org.au>
Subject: Re: [PATCH 0/9][RFC] KVM virtio_net performance
Date: Sun, 27 Jul 2008 16:48:58 +1000 [thread overview]
Message-ID: <200807271648.59100.rusty@rustcorp.com.au> (raw)
In-Reply-To: <488AF240.2060208@qumranet.com>
On Saturday 26 July 2008 19:45:36 Avi Kivity wrote:
> > 5) Eliminating an extra copy on the host->guest path only makes a
> > barely measurable difference.
>
> That's expected on a host->guest test. Zero copy is mostly important
> for guest->external, and with zerocopy already enabled in the guest
> (sendfile or nfs server workloads).
Note that this will also need the copyless tun patches. If we're doing one
copy from userspace->kernel anyway, this extra copy is probably lost in the
noise.
Cheers,
Rusty.
next prev parent reply other threads:[~2008-07-27 6:49 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-07-24 11:46 [PATCH 0/9][RFC] KVM virtio_net performance Mark McLoughlin
2008-07-24 11:46 ` [PATCH 1/9] kvm: qemu: Set MIN_TIMER_REARM_US to 150us Mark McLoughlin
2008-07-24 11:46 ` [PATCH 2/9] kvm: qemu: Fix virtio_net tx timer Mark McLoughlin
2008-07-24 11:46 ` [PATCH 3/9] kvm: qemu: Remove virtio_net tx ring-full heuristic Mark McLoughlin
2008-07-24 11:46 ` [PATCH 4/9] kvm: qemu: Add VIRTIO_F_NOTIFY_ON_EMPTY Mark McLoughlin
2008-07-24 11:46 ` [PATCH 5/9] kvm: qemu: Disable recv notifications until avail buffers exhausted Mark McLoughlin
2008-07-24 11:46 ` [PATCH 6/9] kvm: qemu: Add support for partial csums and GSO Mark McLoughlin
2008-07-24 11:46 ` [PATCH 7/9] kvm: qemu: Increase size of virtio_net rings Mark McLoughlin
2008-07-24 11:46 ` [PATCH 8/9] kvm: qemu: Drop the mutex while reading from tapfd Mark McLoughlin
2008-07-24 11:46 ` [PATCH 9/9] kvm: qemu: Eliminate extra virtio_net copy Mark McLoughlin
2008-07-24 23:33 ` [PATCH 8/9] kvm: qemu: Drop the mutex while reading from tapfd Dor Laor
2008-07-25 17:25 ` Mark McLoughlin
2008-07-24 23:22 ` [PATCH 3/9] kvm: qemu: Remove virtio_net tx ring-full heuristic Dor Laor
2008-07-25 0:30 ` Rusty Russell
2008-07-25 17:30 ` Mark McLoughlin
2008-07-25 17:23 ` Mark McLoughlin
2008-07-24 23:56 ` Dor Laor
2008-07-26 9:48 ` [PATCH 2/9] kvm: qemu: Fix virtio_net tx timer Avi Kivity
2008-07-26 12:08 ` Mark McLoughlin
2008-07-24 11:55 ` [PATCH 0/9][RFC] KVM virtio_net performance Herbert Xu
2008-07-24 16:53 ` Mark McLoughlin
2008-07-24 18:29 ` Anthony Liguori
2008-07-25 16:36 ` Mark McLoughlin
2008-07-24 20:56 ` Anthony Liguori
2008-07-25 17:17 ` Mark McLoughlin
2008-07-25 21:29 ` Dor Laor
2008-07-26 19:09 ` Bill Davidsen
2008-07-27 7:52 ` Avi Kivity
2008-07-27 12:52 ` Bill Davidsen
2008-07-27 13:17 ` Bill Davidsen
2008-07-28 6:42 ` Mark McLoughlin
2008-07-26 9:45 ` Avi Kivity
2008-07-27 6:48 ` Rusty Russell
2008-07-27 6:48 ` Rusty Russell [this message]
2008-08-11 19:56 ` Mark McLoughlin
2008-08-12 13:35 ` Avi Kivity
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