From: Paolo Bonzini <pbonzini@redhat.com>
To: Ming Lei <ming.lei@canonical.com>,
Peter Maydell <peter.maydell@linaro.org>,
qemu-devel@nongnu.org, Stefan Hajnoczi <stefanha@redhat.com>
Cc: Kevin Wolf <kwolf@redhat.com>, Fam Zheng <famz@redhat.com>,
"Michael S. Tsirkin" <mst@redhat.com>
Subject: Re: [Qemu-devel] [PATCH v3 0/3] linux-aio: introduce submit I/O at batch
Date: Tue, 01 Jul 2014 19:06:42 +0200 [thread overview]
Message-ID: <53B2EAA2.1010901@redhat.com> (raw)
In-Reply-To: <1404232537-28628-1-git-send-email-ming.lei@canonical.com>
Il 01/07/2014 18:35, Ming Lei ha scritto:
> Hi,
>
> The commit 580b6b2aa2(dataplane: use the QEMU block layer for I/O)
> introduces ~40% throughput regression on virtio-blk dataplane, and
> one of causes is that submitting I/O at batch is removed.
>
> This patchset trys to introduce this mechanism on block, at least,
> linux-aio can benefit from that.
>
> With these patches, it is observed that thoughout on virtio-blk
> dataplane can be improved a lot, see data in commit log of patch
> 3/3.
>
> It should be possible to apply the batch mechanism to other devices
> (such as virtio-scsi) too.
>
> V3:
> - only support submitting I/O at batch for raw format, pointed by
> Kevin
As I commented in the review, I would like evidence that this is
necessary. It should work for all formats IMO.
Paolo
prev parent reply other threads:[~2014-07-01 17:07 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-07-01 16:35 [Qemu-devel] [PATCH v3 0/3] linux-aio: introduce submit I/O at batch Ming Lei
2014-07-01 16:35 ` [Qemu-devel] [PATCH v3 1/4] block: block: introduce bdrv_io_plug() and bdrv_io_unplug() Ming Lei
2014-07-01 16:35 ` [Qemu-devel] [PATCH v3 2/4] block/raw_bsd.c: support io plug and unplug for raw format image Ming Lei
2014-07-01 16:35 ` [Qemu-devel] [PATCH v3 3/4] linux-aio: implement io plug and unplug Ming Lei
2014-07-01 16:35 ` [Qemu-devel] [PATCH v3 4/4] dataplane: submit I/O at batch Ming Lei
2014-07-01 17:15 ` Eric Blake
2014-07-01 17:06 ` Paolo Bonzini [this message]
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