From: Paolo Bonzini <pbonzini@redhat.com>
To: Kevin Wolf <kwolf@redhat.com>
Cc: tom.leiming@gmail.com, Ming Lei <ming.lei@canonical.com>,
Fam Zheng <famz@redhat.com>, qemu-devel <qemu-devel@nongnu.org>,
Stefan Hajnoczi <stefanha@redhat.com>
Subject: Re: [Qemu-devel] [PATCH v1 00/17] dataplane: optimization and multi virtqueue support
Date: Sun, 17 Aug 2014 07:29:50 +0200 [thread overview]
Message-ID: <53F03DCE.3090909@redhat.com> (raw)
In-Reply-To: <53EE6A45.9010400@redhat.com>
Il 15/08/2014 22:15, Paolo Bonzini ha scritto:
>> > | Random throughput | Sequential throughput
>> > ----------------+-------------------+-----------------------
>> > master | 442 MB/s | 730 MB/s
>> > base | 453 MB/s | 757 MB/s
>> > bypass (Ming) | 461 MB/s | 734 MB/s
>> > coroutine | 468 MB/s | 716 MB/s
>> > bypass (Paolo) | 476 MB/s | 682 MB/s
> This is pretty large, but it really smells like either a setup problem
> or a kernel bug...
Thinking more about the I/O scheduler, it could simply be that faster
I/O = less coalescing = more bios actually reaching the driver = less speed.
It should be possible to find if this is true using blktrace.
(The reason why sequential I/O is faster is coalescing in the I/O
scheduler).
Paolo
next prev parent reply other threads:[~2014-08-17 5:30 UTC|newest]
Thread overview: 81+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-08-05 3:33 [Qemu-devel] [PATCH v1 00/17] dataplane: optimization and multi virtqueue support Ming Lei
2014-08-05 3:33 ` [Qemu-devel] [PATCH v1 01/17] qemu/obj_pool.h: introduce object allocation pool Ming Lei
2014-08-05 11:55 ` Eric Blake
2014-08-05 12:05 ` Michael S. Tsirkin
2014-08-05 12:21 ` Eric Blake
2014-08-05 12:51 ` Michael S. Tsirkin
2014-08-06 2:35 ` Ming Lei
2014-08-05 3:33 ` [Qemu-devel] [PATCH v1 02/17] dataplane: use object pool to speed up allocation for virtio blk request Ming Lei
2014-08-05 12:30 ` Eric Blake
2014-08-06 2:45 ` Ming Lei
2014-08-05 3:33 ` [Qemu-devel] [PATCH v1 03/17] qemu coroutine: support bypass mode Ming Lei
2014-08-05 3:33 ` [Qemu-devel] [PATCH v1 04/17] block: prepare for supporting selective bypass coroutine Ming Lei
2014-08-05 3:33 ` [Qemu-devel] [PATCH v1 05/17] garbage collector: introduced for support of " Ming Lei
2014-08-05 12:43 ` Eric Blake
2014-08-05 3:33 ` [Qemu-devel] [PATCH v1 06/17] block: introduce bdrv_co_can_bypass_co Ming Lei
2014-08-05 3:33 ` [Qemu-devel] [PATCH v1 07/17] block: support to bypass qemu coroutinue Ming Lei
2014-08-05 3:33 ` [Qemu-devel] [PATCH v1 08/17] Revert "raw-posix: drop raw_get_aio_fd() since it is no longer used" Ming Lei
2014-08-05 3:33 ` [Qemu-devel] [PATCH v1 09/17] dataplane: enable selective bypassing coroutine Ming Lei
2014-08-05 3:33 ` [Qemu-devel] [PATCH v1 10/17] linux-aio: fix submit aio as a batch Ming Lei
2014-08-05 3:33 ` [Qemu-devel] [PATCH v1 11/17] linux-aio: handling -EAGAIN for !s->io_q.plugged case Ming Lei
2014-08-05 3:33 ` [Qemu-devel] [PATCH v1 12/17] linux-aio: increase max event to 256 Ming Lei
2014-08-05 3:33 ` [Qemu-devel] [PATCH v1 13/17] linux-aio: remove 'node' from 'struct qemu_laiocb' Ming Lei
2014-08-05 3:33 ` [Qemu-devel] [PATCH v1 14/17] hw/virtio/virtio-blk.h: introduce VIRTIO_BLK_F_MQ Ming Lei
2014-08-05 3:33 ` [Qemu-devel] [PATCH v1 15/17] virtio-blk: support multi queue for non-dataplane Ming Lei
2014-08-05 3:33 ` [Qemu-devel] [PATCH v1 16/17] virtio-blk: dataplane: support multi virtqueue Ming Lei
2014-08-05 3:33 ` [Qemu-devel] [PATCH v1 17/17] hw/virtio-pci: introduce num_queues property Ming Lei
2014-08-05 9:38 ` [Qemu-devel] [PATCH v1 00/17] dataplane: optimization and multi virtqueue support Stefan Hajnoczi
2014-08-05 9:50 ` Ming Lei
2014-08-05 9:56 ` Kevin Wolf
2014-08-05 10:50 ` Ming Lei
2014-08-05 13:59 ` Stefan Hajnoczi
2014-08-05 9:48 ` Kevin Wolf
2014-08-05 10:00 ` Ming Lei
2014-08-05 11:44 ` Paolo Bonzini
2014-08-05 13:48 ` Stefan Hajnoczi
2014-08-05 14:47 ` Kevin Wolf
2014-08-06 5:33 ` Ming Lei
2014-08-06 7:45 ` Paolo Bonzini
2014-08-06 8:38 ` Ming Lei
2014-08-06 8:50 ` Paolo Bonzini
2014-08-06 13:53 ` Ming Lei
2014-08-06 8:48 ` Kevin Wolf
2014-08-06 9:37 ` Ming Lei
2014-08-06 10:09 ` Kevin Wolf
2014-08-06 11:28 ` Ming Lei
2014-08-06 11:44 ` Ming Lei
2014-08-06 15:40 ` Kevin Wolf
2014-08-07 10:27 ` Ming Lei
2014-08-07 10:52 ` Ming Lei
2014-08-07 11:06 ` Kevin Wolf
2014-08-07 13:03 ` Ming Lei
2014-08-07 13:51 ` Kevin Wolf
2014-08-08 10:32 ` Ming Lei
2014-08-08 11:26 ` Ming Lei
2014-08-10 3:46 ` Ming Lei
2014-08-11 14:03 ` Kevin Wolf
2014-08-12 7:53 ` Ming Lei
2014-08-12 11:40 ` Kevin Wolf
2014-08-12 12:14 ` Ming Lei
2014-08-11 19:37 ` Paolo Bonzini
2014-08-12 8:12 ` Ming Lei
2014-08-12 19:08 ` Paolo Bonzini
2014-08-13 9:54 ` Kevin Wolf
2014-08-13 13:16 ` Paolo Bonzini
2014-08-13 13:49 ` Ming Lei
2014-08-14 9:39 ` Stefan Hajnoczi
2014-08-14 10:12 ` Ming Lei
2014-08-15 20:16 ` Paolo Bonzini
2014-08-13 10:19 ` Ming Lei
2014-08-13 12:35 ` Paolo Bonzini
2014-08-13 8:55 ` Stefan Hajnoczi
2014-08-13 11:43 ` Ming Lei
2014-08-13 12:35 ` Paolo Bonzini
2014-08-13 13:07 ` Ming Lei
2014-08-14 10:46 ` Kevin Wolf
2014-08-15 10:39 ` Ming Lei
2014-08-15 20:15 ` Paolo Bonzini
2014-08-16 8:20 ` Ming Lei
2014-08-17 5:29 ` Paolo Bonzini [this message]
2014-08-18 8:58 ` Kevin Wolf
2014-08-06 9:37 ` Stefan Hajnoczi
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