From: Wu Fengguang <fengguang.wu@intel.com>
To: Clemens Ladisch <clemens@ladisch.de>
Cc: Andrew Morton <akpm@linux-foundation.org>,
Jens Axboe <jens.axboe@oracle.com>,
Peter Zijlstra <a.p.zijlstra@chello.nl>,
Linux Memory Management List <linux-mm@kvack.org>,
"linux-fsdevel@vger.kernel.org" <linux-fsdevel@vger.kernel.org>,
LKML <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH 01/11] readahead: limit readahead size for small devices
Date: Thu, 4 Feb 2010 21:00:56 +0800 [thread overview]
Message-ID: <20100204130056.GB25905@localhost> (raw)
In-Reply-To: <4B6A8455.5010403@ladisch.de>
Clemens,
Thanks for the data!
On Thu, Feb 04, 2010 at 04:24:53PM +0800, Clemens Ladisch wrote:
> Wu Fengguang wrote:
> > Anyone has 512/128MB USB stick?
>
> 64 MB, USB full speed:
> Bus 003 Device 003: ID 08ec:0011 M-Systems Flash Disk Pioneers DiskOnKey
>
> 4KB: 139.339 s, 376 kB/s
> 16KB: 81.0427 s, 647 kB/s
> 32KB: 71.8513 s, 730 kB/s
> 64KB: 67.3872 s, 778 kB/s
> 128KB: 67.5434 s, 776 kB/s
> 256KB: 65.9019 s, 796 kB/s
> 512KB: 66.2282 s, 792 kB/s
> 1024KB: 67.4632 s, 777 kB/s
> 2048KB: 69.9759 s, 749 kB/s
It seems to reach good throughput at 64KB readahead size :)
Thanks,
Fengguang
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next prev parent reply other threads:[~2010-02-04 13:00 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-02-02 15:28 [PATCH 00/11] [RFC] 512K readahead size with thrashing safe readahead Wu Fengguang
2010-02-02 15:28 ` [PATCH 01/11] readahead: limit readahead size for small devices Wu Fengguang
2010-02-02 19:38 ` Jens Axboe
2010-02-03 6:13 ` Wu Fengguang
2010-02-03 8:23 ` Jens Axboe
2010-02-04 8:24 ` Clemens Ladisch
2010-02-04 13:00 ` Wu Fengguang [this message]
2010-02-02 15:28 ` [PATCH 02/11] readahead: bump up the default readahead size Wu Fengguang
2010-02-02 15:28 ` [PATCH 03/11] readahead: introduce {MAX|MIN}_READAHEAD_PAGES macros for ease of use Wu Fengguang
2010-02-02 15:28 ` [PATCH 04/11] readahead: replace ra->mmap_miss with ra->ra_flags Wu Fengguang
2010-02-02 15:28 ` [PATCH 05/11] readahead: retain inactive lru pages to be accessed soon Wu Fengguang
2010-02-02 15:28 ` [PATCH 06/11] readahead: thrashing safe context readahead Wu Fengguang
2010-02-02 15:28 ` [PATCH 07/11] readahead: record readahead patterns Wu Fengguang
2010-02-02 15:28 ` [PATCH 08/11] readahead: add tracing event Wu Fengguang
2010-02-12 16:19 ` Steven Rostedt
2010-02-14 3:56 ` Wu Fengguang
2010-02-02 15:28 ` [PATCH 09/11] readahead: add /debug/readahead/stats Wu Fengguang
2010-02-02 15:28 ` [PATCH 10/11] readahead: dont do start-of-file readahead after lseek() Wu Fengguang
2010-02-02 17:39 ` Linus Torvalds
2010-02-02 18:13 ` Olivier Galibert
2010-02-02 18:40 ` Linus Torvalds
2010-02-02 18:48 ` Olivier Galibert
2010-02-02 19:14 ` Linus Torvalds
2010-02-02 19:59 ` david
2010-02-02 20:22 ` Linus Torvalds
2010-02-02 15:28 ` [PATCH 11/11] radixtree: speed up next/prev hole search Wu Fengguang
2010-02-02 22:38 ` [PATCH 00/11] [RFC] 512K readahead size with thrashing safe readahead Vivek Goyal
2010-02-02 23:17 ` Vivek Goyal
2010-02-03 6:27 ` Wu Fengguang
2010-02-03 15:24 ` Vivek Goyal
2010-02-03 15:58 ` Vivek Goyal
2010-02-04 13:21 ` Wu Fengguang
2010-02-04 15:52 ` Vivek Goyal
2010-02-04 13:44 ` Wu Fengguang
-- strict thread matches above, loose matches on Subject: below --
2010-02-07 4:10 [PATCH 00/11] " Wu Fengguang
2010-02-07 4:10 ` [PATCH 01/11] readahead: limit readahead size for small devices Wu Fengguang
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