qemu-devel
[Top][All Lists]
Advanced

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

[Qemu-devel] [PATCH v6 0/3] linux-aio: introduce submit I/O as a batch


From: Ming Lei
Subject: [Qemu-devel] [PATCH v6 0/3] linux-aio: introduce submit I/O as a batch
Date: Fri, 4 Jul 2014 18:04:32 +0800

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 as a 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.

TODO:
        - support queuing I/O to multi files for scsi devies, which
    need some changes to linux-aio

V6:
        - fix requests leak if part of them arn't submitted successfully,
        pointed by Stefan
        - linux-aio.c coding style fix

V5:
        - rebase on v2.1.0-rc0 of qemu.git/master
        - block/linux-aio.c code style fix
        - don't flush io queue before flush, pointed by Paolo

V4:
        - support other non-raw formats with under-optimized performance
        - use reference counter for plug & unplug
        - flush io queue before sending flush command

V3:
        - only support submitting I/O as a batch for raw format, pointed by
    Kevin

V2:
        - define return value of bdrv_io_unplug as void, suggested by Paolo
        - avoid busy-wait for handling io_submit
V1:
        - move queuing io stuff into linux-aio.c as suggested by Paolo


Thanks,
--
Ming Lei






reply via email to

[Prev in Thread] Current Thread [Next in Thread]