From: Avi Kivity <avi@qumranet.com>
To: Rusty Russell <rusty@rustcorp.com.au>
Cc: Anthony Liguori <aliguori@us.ibm.com>,
Mark McLoughlin <markmc@redhat.com>,
kvm@vger.kernel.org
Subject: Re: [PATCH 4/5] kvm: qemu: Use vringfd to eliminate copies
Date: Wed, 18 Jun 2008 07:01:53 -0700 [thread overview]
Message-ID: <48591551.4030205@qumranet.com> (raw)
In-Reply-To: <200806161210.57926.rusty@rustcorp.com.au>
Rusty Russell wrote:
> Yeah, every time I get close to benchmarking I find another bug :( But I've
> spent some time optimising the normal lguest net device, so we'll have a fair
> comparison.
>
> In theory vringfd will get us zero copy from guest sendfile out to external
> machines. For anything else we're doing a copy anyway, so avoiding copying
> has no great benefit.
>
> The interface is still worthwhile to provide zero-copy receive on intelligent
> or bound NICs, but that's science fiction at the moment...
>
>
Eddie is planning exactly this...
--
I have a truly marvellous patch that fixes the bug which this
signature is too narrow to contain.
next prev parent reply other threads:[~2008-06-18 14:01 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-06-13 13:57 [PATCH 0/0][RFC] KVM use of vringfd Mark McLoughlin
2008-06-13 13:57 ` [PATCH 1/5] vring: Replace mmap() interface with ioctl() Mark McLoughlin
2008-06-13 13:57 ` [PATCH 2/5] lguest: Use VRINGSETINFO ioctl() instead of mmap() Mark McLoughlin
2008-06-13 13:57 ` [PATCH 3/5] kvm: qemu: Publish last_avail index in the ring Mark McLoughlin
2008-06-13 13:58 ` [PATCH 4/5] kvm: qemu: Use vringfd to eliminate copies Mark McLoughlin
2008-06-13 13:58 ` [PATCH 5/5] kvm: qemu: Add support for partial csums and GSO Mark McLoughlin
2008-06-14 23:28 ` [PATCH 4/5] kvm: qemu: Use vringfd to eliminate copies Anthony Liguori
2008-06-16 2:10 ` Rusty Russell
2008-06-16 14:02 ` Anthony Liguori
2008-06-16 14:58 ` Avi Kivity
2008-06-18 5:43 ` Rusty Russell
2008-06-18 14:01 ` Avi Kivity [this message]
2008-06-17 14:08 ` Mark McLoughlin
2008-06-17 14:54 ` Anthony Liguori
2008-06-17 15:45 ` Mark McLoughlin
2008-06-13 14:09 ` [PATCH 1/5] vring: Replace mmap() interface with ioctl() Avi Kivity
2008-06-17 12:19 ` Mark McLoughlin
2008-06-18 14:05 ` Avi Kivity
2008-06-14 9:02 ` Rusty Russell
2008-06-14 14:20 ` Avi Kivity
2008-06-14 23:23 ` Anthony Liguori
2008-06-15 15:24 ` Avi Kivity
2008-06-15 19:13 ` Anthony Liguori
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