From: Willy Tarreau <w@1wt.eu>
To: Tim Schmielau <tim@physik3.uni-rostock.de>
Cc: "Ismail Dönmez" <ismail@pardus.org.tr>, linux-kernel@vger.kernel.org
Subject: Re: Abysmal disk performance, how to debug?
Date: Sat, 20 Jan 2007 21:31:41 +0100 [thread overview]
Message-ID: <20070120203140.GE25307@1wt.eu> (raw)
In-Reply-To: <Pine.LNX.4.63.0701202124180.23674@gockel.physik3.uni-rostock.de>
On Sat, Jan 20, 2007 at 09:28:57PM +0100, Tim Schmielau wrote:
> On Sat, 20 Jan 2007, Willy Tarreau wrote:
>
> > Anyway, in your situation with a very small buffer, this should not
> > change by more than half a second or so.
>
> Well, his buffer is not small. He has half a GB of RAM, so when
> writing 1 GB the buffer would roughly double the dd speed, exactly as he
> has shown us.
yes, but he sees the opposite : when using half of the memory for the
buffer, he has low speed. When shorting cache size to 2% only, he doubles
his speed.
> Anyways, instead of always just posting similar answers to yours, I'll
> have dinner now. :-)
:-)
Willy
next prev parent reply other threads:[~2007-01-20 20:32 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
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 [this message]
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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