From: Benjamin LaHaise <bcrl@kvack.org>
To: Maxim Patlasov <mpatlasov@parallels.com>
Cc: Ming Lei <ming.lei@canonical.com>, Jens Axboe <axboe@kernel.dk>,
Christoph Hellwig <hch@infradead.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Andrew Morton <akpm@linux-foundation.org>,
Dave Kleikamp <dave.kleikamp@oracle.com>,
Zach Brown <zab@zabbo.net>, Kent Overstreet <kmo@daterainc.com>,
open list: AIO <linux-aio@kvack.org>,
Linux FS Devel <linux-fsdevel@vger.kernel.org>,
Dave Chinner <david@fromorbit.com>;
Subject: Re: [PATCH v1 5/9] block: loop: convert to blk-mq
Date: Wed, 27 Aug 2014 12:29:55 -0400 [thread overview]
Message-ID: <20140827162955.GF4827@kvack.org> (raw)
In-Reply-To: <53FE029B.1030200@parallels.com>
On Wed, Aug 27, 2014 at 08:08:59PM +0400, Maxim Patlasov wrote:
...
> 1) /dev/loop0 of 3.17.0-rc1 with Ming's patches applied -- 11K iops
> 2) the same as above, but call loop_queue_work() directly from
> loop_queue_rq() -- 270K iops
> 3) /dev/nullb0 of 3.17.0-rc1 -- 380K iops
>
> Taking into account so big difference (11K vs. 270K), would it be worthy
> to implement pure non-blocking version of aio_kernel_submit() returning
> error if blocking needed? Then loop driver (or any other in-kernel user)
> might firstly try that non-blocking submit as fast-path, and, only if
> it's failed, fall back to queueing.
What filesystem is the backing file for loop0 on? O_DIRECT access as
Ming's patches use should be non-blocking, and if not, that's something
to fix.
-ben
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next prev parent reply other threads:[~2014-08-27 16:29 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-08-14 15:50 [PATCH v1 0/9] block & aio: kernel aio and loop mq conversion Ming Lei
2014-08-14 15:50 ` [PATCH v1 1/9] aio: add aio_kernel_() interface Ming Lei
2014-08-14 18:07 ` Zach Brown
2014-08-15 13:20 ` Ming Lei
2014-08-14 15:50 ` [PATCH v1 2/9] fd/direct-io: introduce should_dirty for kernel aio Ming Lei
2014-08-14 15:50 ` [PATCH v1 3/9] blk-mq: export blk_mq_freeze_queue and blk_mq_unfreeze_queue Ming Lei
2014-08-14 15:50 ` [PATCH v1 4/9] blk-mq: introduce init_flush_rq_fn callback in 'blk_mq_ops' Ming Lei
2014-08-15 16:19 ` Jens Axboe
2014-08-16 7:49 ` Ming Lei
2014-08-17 18:39 ` Jens Axboe
2014-08-14 15:50 ` [PATCH v1 5/9] block: loop: convert to blk-mq Ming Lei
2014-08-15 16:31 ` Christoph Hellwig
2014-08-15 16:36 ` Jens Axboe
2014-08-15 16:46 ` Jens Axboe
2014-08-16 8:06 ` Ming Lei
2014-08-17 17:48 ` Jens Axboe
2014-08-18 1:22 ` Ming Lei
2014-08-18 11:53 ` Ming Lei
2014-08-19 20:50 ` Jens Axboe
[not found] ` <CACVXFVP_q2MfZtjPAgXrjMJS2K6H2fTFtAe3ZJXBW83uEovqkQ@mail.gmail.com>
2014-08-20 16:09 ` Jens Axboe
[not found] ` <CACVXFVPxXrYi+m0bC7tEcfvDzhQ=Xnapkd+yGRXbKCktgi3Ofw@mail.gmail.com>
2014-08-21 2:58 ` Jens Axboe
[not found] ` <CACVXFVNEuEOXphJK5XGbAGRC9tL7iTv=PE_v+Dnw3CReAEkonw@mail.gmail.com>
2014-08-21 3:16 ` Jens Axboe
[not found] ` <CACVXFVOR0mzMWo+iPtU8jUvYgH+non=hQ0XaP0Z1Fu0qiSbJNA@mail.gmail.com>
2014-08-27 16:08 ` Maxim Patlasov
2014-08-27 16:29 ` Benjamin LaHaise [this message]
2014-08-27 17:19 ` Maxim Patlasov
2014-08-27 17:56 ` Zach Brown
2014-08-28 2:10 ` Ming Lei
2014-08-28 2:06 ` Ming Lei
2014-08-29 11:14 ` Maxim Patlasov
2014-08-14 15:50 ` [PATCH v1 6/9] block: loop: say goodby to bio Ming Lei
2014-08-14 15:50 ` [PATCH v1 7/9] block: loop: introduce lo_discard() and lo_req_flush() Ming Lei
2014-08-14 15:50 ` [PATCH v1 8/9] block: loop: don't handle REQ_FUA explicitly Ming Lei
2014-08-14 15:50 ` [PATCH v1 9/9] block: loop: support to submit I/O via kernel aio based Ming Lei
2014-08-14 16:53 ` [PATCH v1 0/9] block & aio: kernel aio and loop mq conversion Jens Axboe
2014-08-15 12:59 ` Ming Lei
2014-08-15 13:11 ` Christoph Hellwig
2014-08-15 14:32 ` Ming Lei
-- strict thread matches above, loose matches on Subject: below --
2014-08-29 10:41 [PATCH v1 5/9] block: loop: convert to blk-mq Maxim Patlasov
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