From: Elladan <elladan@eskimo.com>
To: Bill Davidsen <davidsen@tmr.com>
Cc: linux-kernel@vger.kernel.org,
"Sunil Naidu" <akula2.shark@gmail.com>,
"Ismail Dönmez" <ismail@pardus.org.tr>
Subject: Re: Abysmal disk performance, how to debug?
Date: Sat, 3 Feb 2007 09:22:04 -0800 [thread overview]
Message-ID: <20070203172204.GA29334@eskimo.com> (raw)
In-Reply-To: <45BBAB48.9060304@tmr.com>
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.
next prev parent reply other threads:[~2007-02-03 17:35 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-01-20 17:20 Abysmal disk performance, how to debug? Ismail Dönmez
2007-01-20 17:45 ` Willy Tarreau
2007-01-20 17:52 ` Ismail Dönmez
2007-01-20 18:03 ` Willy Tarreau
2007-01-20 18:06 ` Ismail Dönmez
2007-01-20 19:44 ` Sunil Naidu
2007-01-20 19:56 ` Stephen Clark
2007-01-20 20:09 ` Willy Tarreau
2007-01-21 3:41 ` Stephen Clark
2007-01-21 4:06 ` Gene Heskett
2007-01-27 19:43 ` Bill Davidsen
2007-02-03 17:22 ` Elladan [this message]
2007-01-20 20:05 ` Willy Tarreau
2007-01-20 20:11 ` Ismail Dönmez
2007-01-20 20:10 ` Tim Schmielau
2007-01-20 20:16 ` Ismail Dönmez
2007-01-20 20:19 ` Willy Tarreau
2007-01-20 20:28 ` Tim Schmielau
2007-01-20 20:31 ` Willy Tarreau
2007-01-20 20:21 ` Tim Schmielau
2007-01-20 20:28 ` Willy Tarreau
2007-01-20 20:39 ` Tim Schmielau
2007-01-20 21:24 ` Willy Tarreau
2007-01-20 21:41 ` Tim Schmielau
2007-01-20 21:12 ` Sunil Naidu
2007-01-20 22:00 ` Tim Schmielau
2007-01-20 23:47 ` Sunil Naidu
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