From: "Miquel van Smoorenburg" <miquels@cistron.nl>
To: linux-kernel@vger.kernel.org
Subject: Re: High write latency, iowait, slow writes 2.6.9
Date: Wed, 12 Jan 2005 21:20:18 +0000 (UTC) [thread overview]
Message-ID: <cs44ai$oet$1@news.cistron.nl> (raw)
In-Reply-To: 41E4BB99.90908@zanfx.com
In article <41E4BB99.90908@zanfx.com>,
Paul A. Sumner <paul@zanfx.com> wrote:
>I have a new server that during big io tasks, e.g., bonnie++ and
>tiobench testing, becomes very unresponsive. Both bonnie++ and tiobench
>show good read performance, but the write performance lags, max
>latencies are into the *minutes* and it experiences extended high
>iowait. I'm guessing the iowait may not be a real problem. The machine
>is as follows:
Try another IO scheduler (boot with elevator=deadline or elevator=cfq
on the kernel command line)
Mike.
next prev parent reply other threads:[~2005-01-13 1:52 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-01-12 5:54 High write latency, iowait, slow writes 2.6.9 Paul A. Sumner
2005-01-12 21:20 ` Miquel van Smoorenburg [this message]
2005-01-13 6:59 ` Paul A. Sumner
2005-01-13 8:56 ` Jens Axboe
2005-01-13 19:01 ` Paul A. Sumner
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