From: Paolo Bonzini <pbonzini@redhat.com>
To: Andrey Korolyov <andrey@xdel.ru>, Fam Zheng <famz@redhat.com>
Cc: Kevin Wolf <kwolf@redhat.com>, qemu block <qemu-block@nongnu.org>,
"qemu-devel@nongnu.org" <qemu-devel@nongnu.org>,
jcody@redhat.com, Markus Armbruster <armbru@redhat.com>,
Max Reitz <mreitz@redhat.com>,
Stefan Hajnoczi <stefanha@redhat.com>,
Amit Shah <amit.shah@redhat.com>
Subject: Re: [Qemu-devel] [PATCH v6 01/13] block: Add op blocker type "device IO"
Date: Sat, 30 May 2015 15:21:30 +0200 [thread overview]
Message-ID: <5569B95A.6030202@redhat.com> (raw)
In-Reply-To: <CABYiri8eTaESP2rf2d1VBvAR4hsahXP5k91xmbmo560PaZ7whg@mail.gmail.com>
On 29/05/2015 13:11, Andrey Korolyov wrote:
> Sorry for a potential thread hijack, but I`m curious about the reasons
> to not making advertised queue depth for non-passthrough backends an
> independent tunable, is there any concerns behind that?
It certainly can be made tunable. Usually it is bounded actually, for
example PATA has a queue depth of 1 (!) while AHCI has 32. For virtio
(blk and scsi) it actually is already somewhat tunable, since the queue
depth is limited by the size of the virtqueue.
Paolo
next prev parent reply other threads:[~2015-05-30 13:22 UTC|newest]
Thread overview: 56+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-05-21 6:42 [Qemu-devel] [PATCH v6 00/13] Fix transactional snapshot with dataplane and NBD export Fam Zheng
2015-05-21 6:42 ` [Qemu-devel] [PATCH v6 01/13] block: Add op blocker type "device IO" Fam Zheng
2015-05-21 7:06 ` Wen Congyang
2015-05-21 7:32 ` Fam Zheng
2015-05-22 4:54 ` Fam Zheng
2015-05-23 16:51 ` Max Reitz
2015-05-25 2:15 ` Fam Zheng
2015-05-21 8:00 ` Wen Congyang
2015-05-21 12:44 ` Fam Zheng
2015-05-22 6:18 ` Wen Congyang
2015-05-26 14:22 ` Kevin Wolf
2015-05-26 14:24 ` Max Reitz
2015-05-27 9:07 ` Kevin Wolf
2015-05-27 9:50 ` Paolo Bonzini
2015-05-27 10:10 ` Kevin Wolf
2015-05-27 10:43 ` Paolo Bonzini
2015-05-28 2:49 ` Fam Zheng
2015-05-28 8:23 ` Paolo Bonzini
2015-05-28 10:46 ` Fam Zheng
2015-05-28 10:52 ` Paolo Bonzini
2015-05-28 11:11 ` Fam Zheng
2015-05-28 11:19 ` Paolo Bonzini
2015-05-28 12:05 ` Fam Zheng
2015-05-29 11:11 ` Andrey Korolyov
2015-05-30 13:21 ` Paolo Bonzini [this message]
2015-05-28 9:40 ` Kevin Wolf
2015-05-28 10:55 ` Fam Zheng
2015-05-28 11:00 ` Paolo Bonzini
2015-05-28 11:24 ` Kevin Wolf
2015-05-28 11:41 ` Paolo Bonzini
2015-05-28 11:44 ` Fam Zheng
2015-05-28 11:47 ` Paolo Bonzini
2015-05-28 12:04 ` Fam Zheng
2015-05-21 6:42 ` [Qemu-devel] [PATCH v6 02/13] block: Add op blocker notifier list Fam Zheng
2015-05-21 6:42 ` [Qemu-devel] [PATCH v6 03/13] block-backend: Add blk_op_blocker_add_notifier Fam Zheng
2015-05-21 6:42 ` [Qemu-devel] [PATCH v6 04/13] virtio-blk: Move complete_request to 'ops' structure Fam Zheng
2015-05-21 6:42 ` [Qemu-devel] [PATCH v6 05/13] virtio-blk: Don't handle output when there is "device IO" op blocker Fam Zheng
2015-05-23 16:53 ` Max Reitz
2015-05-21 6:42 ` [Qemu-devel] [PATCH v6 06/13] virtio-scsi-dataplane: Add "device IO" op blocker listener Fam Zheng
2015-05-23 16:53 ` Max Reitz
2015-05-21 6:42 ` [Qemu-devel] [PATCH v6 07/13] nbd-server: Clear "can_read" when "device io" blocker is set Fam Zheng
2015-05-23 16:54 ` Max Reitz
2015-05-21 6:42 ` [Qemu-devel] [PATCH v6 08/13] blockdev: Block device IO during internal snapshot transaction Fam Zheng
2015-05-23 16:56 ` Max Reitz
2015-05-21 6:42 ` [Qemu-devel] [PATCH v6 09/13] blockdev: Block device IO during external " Fam Zheng
2015-05-23 16:58 ` Max Reitz
2015-05-21 6:43 ` [Qemu-devel] [PATCH v6 10/13] blockdev: Block device IO during drive-backup transaction Fam Zheng
2015-05-23 16:59 ` Max Reitz
2015-05-21 6:43 ` [Qemu-devel] [PATCH v6 11/13] blockdev: Block device IO during blockdev-backup transaction Fam Zheng
2015-05-23 17:05 ` Max Reitz
2015-05-21 6:43 ` [Qemu-devel] [PATCH v6 12/13] block: Block "device IO" during bdrv_drain and bdrv_drain_all Fam Zheng
2015-05-23 17:11 ` Max Reitz
2015-05-25 2:48 ` Fam Zheng
2015-05-26 14:21 ` Max Reitz
2015-05-21 6:43 ` [Qemu-devel] [PATCH v6 13/13] block/mirror: Block "device IO" during mirror exit Fam Zheng
2015-05-23 17:21 ` Max Reitz
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