Date: Sat, 3 Feb 2007 09:22:04 -0800
From: Elladan <elladan@eskimo.com>
To: Bill Davidsen <davidsen@tmr.com>
Cc: linux-kernel@vger.kernel.org, Sunil Naidu <akula2.shark@gmail.com>,
       Ismail =?iso-8859-1?Q?D=F6nmez?= <ismail@pardus.org.tr>
Subject: Re: Abysmal disk performance, how to debug?
Message-ID: <20070203172204.GA29334@eskimo.com>
References: <200701201920.54620.ismail@pardus.org.tr> <20070120174503.GZ24090@1wt.eu> <200701201952.54714.ismail@pardus.org.tr> <20070120180344.GA23841@1wt.eu> <8355959a0701201144x290362d8ja6cd5bc1408475da@mail.gmail.com> <45B273E4.8040302@seclark.us> <20070120200916.GB25307@1wt.eu> <45BBAB48.9060304@tmr.com>
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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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