From: Wu Fengguang <fengguang.wu@intel.com>
To: Hisashi Hifumi <hifumi.hisashi@oss.ntt.co.jp>
Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>,
Andrew Morton <akpm@linux-foundation.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"linux-fsdevel@vger.kernel.org" <linux-fsdevel@vger.kernel.org>,
linux-mm <linux-mm@kvack.org>, Jens Axboe <jens.axboe@oracle.com>
Subject: Re: [PATCH] readahead:add blk_run_backing_dev
Date: Wed, 20 May 2009 10:52:58 +0800 [thread overview]
Message-ID: <20090520025258.GA8318@localhost> (raw)
In-Reply-To: <6.0.0.20.2.20090520104202.071d0be8@172.19.0.2>
On Wed, May 20, 2009 at 09:43:18AM +0800, Hisashi Hifumi wrote:
>
> At 10:07 09/05/20, KOSAKI Motohiro wrote:
> >(cc to Wu and linux-mm)
> >
> >> Hi.
> >>
> >> I wrote a patch that adds blk_run_backing_dev on page_cache_async_readahead
> >> so readahead I/O is unpluged to improve throughput.
> >>
> >> Following is the test result with dd.
> >>
> >> #dd if=testdir/testfile of=/dev/null bs=16384
> >>
> >> -2.6.30-rc6
> >> 1048576+0 records in
> >> 1048576+0 records out
> >> 17179869184 bytes (17 GB) copied, 224.182 seconds, 76.6 MB/s
> >>
> >> -2.6.30-rc6-patched
> >> 1048576+0 records in
> >> 1048576+0 records out
> >> 17179869184 bytes (17 GB) copied, 206.465 seconds, 83.2 MB/s
> >>
> >> Sequential read performance on a big file was improved.
> >> Please merge my patch.
> >
> >I guess the improvement depend on readahead window size.
> >Have you mesure random access workload?
>
> I tried with iozone. But there was no difference.
It does not impact random IO because the patch only modified the
*async* readahead path, and random IO is obviously *sync* ones.
WARNING: multiple messages have this Message-ID (diff)
From: Wu Fengguang <fengguang.wu@intel.com>
To: Hisashi Hifumi <hifumi.hisashi@oss.ntt.co.jp>
Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>,
Andrew Morton <akpm@linux-foundation.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"linux-fsdevel@vger.kernel.org" <linux-fsdevel@vger.kernel.org>,
linux-mm <linux-mm@kvack.org>, Jens Axboe <jens.axboe@oracle.com>
Subject: Re: [PATCH] readahead:add blk_run_backing_dev
Date: Wed, 20 May 2009 10:52:58 +0800 [thread overview]
Message-ID: <20090520025258.GA8318@localhost> (raw)
In-Reply-To: <6.0.0.20.2.20090520104202.071d0be8@172.19.0.2>
On Wed, May 20, 2009 at 09:43:18AM +0800, Hisashi Hifumi wrote:
>
> At 10:07 09/05/20, KOSAKI Motohiro wrote:
> >(cc to Wu and linux-mm)
> >
> >> Hi.
> >>
> >> I wrote a patch that adds blk_run_backing_dev on page_cache_async_readahead
> >> so readahead I/O is unpluged to improve throughput.
> >>
> >> Following is the test result with dd.
> >>
> >> #dd if=testdir/testfile of=/dev/null bs=16384
> >>
> >> -2.6.30-rc6
> >> 1048576+0 records in
> >> 1048576+0 records out
> >> 17179869184 bytes (17 GB) copied, 224.182 seconds, 76.6 MB/s
> >>
> >> -2.6.30-rc6-patched
> >> 1048576+0 records in
> >> 1048576+0 records out
> >> 17179869184 bytes (17 GB) copied, 206.465 seconds, 83.2 MB/s
> >>
> >> Sequential read performance on a big file was improved.
> >> Please merge my patch.
> >
> >I guess the improvement depend on readahead window size.
> >Have you mesure random access workload?
>
> I tried with iozone. But there was no difference.
It does not impact random IO because the patch only modified the
*async* readahead path, and random IO is obviously *sync* ones.
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next prev parent reply other threads:[~2009-05-20 2:53 UTC|newest]
Thread overview: 77+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-05-18 9:38 [PATCH] readahead:add blk_run_backing_dev Hisashi Hifumi
2009-05-18 17:53 ` Jens Axboe
2009-05-19 0:44 ` Hisashi Hifumi
2009-05-19 10:05 ` Hisashi Hifumi
2009-05-20 0:55 ` Hisashi Hifumi
2009-05-20 2:51 ` Wu Fengguang
2009-05-20 2:51 ` Wu Fengguang
2009-05-21 6:01 ` Hisashi Hifumi
2009-05-21 6:01 ` Hisashi Hifumi
2009-05-22 1:05 ` Wu Fengguang
2009-05-22 1:05 ` Wu Fengguang
2009-05-22 1:44 ` Hisashi Hifumi
2009-05-22 1:44 ` Hisashi Hifumi
2009-05-22 2:33 ` Wu Fengguang
2009-05-22 2:33 ` Wu Fengguang
2009-05-26 23:42 ` Andrew Morton
2009-05-26 23:42 ` Andrew Morton
2009-05-27 0:25 ` Hisashi Hifumi
2009-05-27 0:25 ` Hisashi Hifumi
2009-05-27 0:25 ` Hisashi Hifumi
2009-05-27 2:09 ` Wu Fengguang
2009-05-27 2:09 ` Wu Fengguang
2009-05-27 2:21 ` Hisashi Hifumi
2009-05-27 2:21 ` Hisashi Hifumi
2009-05-27 2:35 ` KOSAKI Motohiro
2009-05-27 2:35 ` KOSAKI Motohiro
2009-05-27 2:36 ` Andrew Morton
2009-05-27 2:36 ` Andrew Morton
2009-05-27 2:38 ` Hisashi Hifumi
2009-05-27 2:38 ` Hisashi Hifumi
2009-05-27 3:55 ` Wu Fengguang
2009-05-27 3:55 ` Wu Fengguang
2009-05-27 4:06 ` KOSAKI Motohiro
2009-05-27 4:06 ` KOSAKI Motohiro
2009-05-27 4:36 ` Wu Fengguang
2009-05-27 4:36 ` Wu Fengguang
2009-05-27 6:20 ` Hisashi Hifumi
2009-05-27 6:20 ` Hisashi Hifumi
2009-05-28 1:20 ` Hisashi Hifumi
2009-05-28 1:20 ` Hisashi Hifumi
2009-05-28 2:23 ` KOSAKI Motohiro
2009-05-28 2:23 ` KOSAKI Motohiro
2009-06-01 1:39 ` Hisashi Hifumi
2009-06-01 1:39 ` Hisashi Hifumi
2009-06-01 1:39 ` Hisashi Hifumi
2009-06-01 2:23 ` KOSAKI Motohiro
2009-06-01 2:23 ` KOSAKI Motohiro
2009-05-27 2:36 ` Wu Fengguang
2009-05-27 2:36 ` Wu Fengguang
2009-05-27 2:47 ` Hisashi Hifumi
2009-05-27 2:47 ` Hisashi Hifumi
2009-05-27 2:57 ` Wu Fengguang
2009-05-27 2:57 ` Wu Fengguang
2009-05-27 3:06 ` Hisashi Hifumi
2009-05-27 3:06 ` Hisashi Hifumi
2009-05-27 3:26 ` KOSAKI Motohiro
2009-05-27 3:26 ` KOSAKI Motohiro
2009-06-01 2:37 ` Wu Fengguang
2009-06-01 2:37 ` Wu Fengguang
2009-06-01 2:51 ` Hisashi Hifumi
2009-06-01 2:51 ` Hisashi Hifumi
2009-06-01 3:02 ` Wu Fengguang
2009-06-01 3:02 ` Wu Fengguang
2009-06-01 3:06 ` KOSAKI Motohiro
2009-06-01 3:06 ` KOSAKI Motohiro
2009-06-01 3:07 ` Hisashi Hifumi
2009-06-01 3:07 ` Hisashi Hifumi
2009-06-01 4:30 ` Wu Fengguang
2009-06-01 4:30 ` Wu Fengguang
2009-05-27 2:07 ` Wu Fengguang
2009-05-27 2:07 ` Wu Fengguang
2009-05-20 1:07 ` KOSAKI Motohiro
2009-05-20 1:07 ` KOSAKI Motohiro
2009-05-20 1:43 ` Hisashi Hifumi
2009-05-20 1:43 ` Hisashi Hifumi
2009-05-20 2:52 ` Wu Fengguang [this message]
2009-05-20 2:52 ` Wu Fengguang
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