linux-kernel - Re: Abysmal disk performance, how to debug?

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Message-ID: <20070203172204.GA29334@eskimo.com>
Date:	Sat, 3 Feb 2007 09:22:04 -0800
From:	Elladan <elladan@...imo.com>
To:	Bill Davidsen <davidsen@....com>
Cc:	linux-kernel@...r.kernel.org, Sunil Naidu <akula2.shark@...il.com>,
	Ismail Dönmez <ismail@...dus.org.tr>
Subject: Re: Abysmal disk performance, how to debug?

You guys are making this harder than it needs to be.  Try this:

sync 	# To make sure nothing else is writing
dd if=/dev/zero of=file bs=1M count=1024 oflag=dsync

You'll get reasonable numbers this way out of dd.

-J

On Sat, Jan 27, 2007 at 02:43:04PM -0500, Bill Davidsen wrote:
> What you want is this:
>   sync;
>   time bash -c "dd if=/dev/zero of=/tmp/1GB bs=1M count=1024; sync"
> which will actually time the write with the time command.
-
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