From: Avi Kivity <avi@redhat•com>
To: "Michael S. Tsirkin" <mst@redhat•com>
Cc: davem@davemloft•net, Juan Quintela <quintela@redhat•com>,
Rusty Russell <rusty@rustcorp•com.au>,
"Paul E. McKenney" <paulmck@linux•vnet.ibm.com>,
Arnd Bergmann <arnd@arndb•de>,
kvm@vger•kernel.org, virtualization@lists•osdl.org,
netdev@vger•kernel.org, linux-kernel@vger•kernel.org,
alex.williamson@redhat•com, amit.shah@redhat•com
Subject: Re: [PATCH] vhost-net: utilize PUBLISH_USED_IDX feature
Date: Wed, 19 May 2010 20:04:51 +0300 [thread overview]
Message-ID: <4BF41A33.8090309@redhat.com> (raw)
In-Reply-To: <20100518011931.GA21918@redhat.com>
On 05/18/2010 04:19 AM, Michael S. Tsirkin wrote:
> With PUBLISH_USED_IDX, guest tells us which used entries
> it has consumed. This can be used to reduce the number
> of interrupts: after we write a used entry, if the guest has not yet
> consumed the previous entry, or if the guest has already consumed the
> new entry, we do not need to interrupt.
> This imporves bandwidth by 30% under some workflows.
>
> Signed-off-by: Michael S. Tsirkin<mst@redhat•com>
> ---
>
> Rusty, Dave, this patch depends on the patch
> "virtio: put last seen used index into ring itself"
> which is currently destined at Rusty's tree.
> Rusty, if you are taking that one for 2.6.35, please
> take this one as well.
> Dave, any objections?
>
I object: I think the index should have its own cacheline, and that it
should be documented before merging.
--
Do not meddle in the internals of kernels, for they are subtle and quick to panic.
next prev parent reply other threads:[~2010-05-19 17:04 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20100518011931.GA21918@redhat.com>
2010-05-18 4:08 ` [PATCH] vhost-net: utilize PUBLISH_USED_IDX feature David Miller
2010-05-19 17:04 ` Avi Kivity [this message]
2010-05-19 22:27 ` Michael S. Tsirkin
2010-05-20 4:18 ` Rusty Russell
2010-05-20 6:06 ` Avi Kivity
2010-05-18 1:19 Michael S. Tsirkin
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