linux-kernel - Re: [PATCH 01/11] readahead: limit readahead size for small devices

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Message-ID: <4B6A8455.5010403@ladisch.de>
Date:	Thu, 04 Feb 2010 09:24:53 +0100
From:	Clemens Ladisch <clemens@...isch.de>
To:	Wu Fengguang <fengguang.wu@...el.com>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	Jens Axboe <jens.axboe@...cle.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Linux Memory Management List <linux-mm@...ck.org>,
	linux-fsdevel@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 01/11] readahead: limit readahead size for small devices

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
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