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

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Date:	Thu, 4 Feb 2010 21:00:56 +0800
From:	Wu Fengguang <fengguang.wu@...el.com>
To:	Clemens Ladisch <clemens@...isch.de>
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" <linux-fsdevel@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 01/11] readahead: limit readahead size for small devices

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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