linux-kernel - Re: Poor desktop responsiveness with background I/O-operations

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Date:	Sun, 20 Sep 2009 22:22:20 +0200 (CEST)
From:	Jiri Kosina <jkosina@...e.cz>
To:	Ulrich Lukas <stellplatz-nr.13a@...enparkplatz.de>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Jan Kara <jack@...e.cz>
Subject: Re: Poor desktop responsiveness with background I/O-operations

On Sun, 20 Sep 2009, Ulrich Lukas wrote:

> Test case:
> - 64-bit dual-core PC, SATA harddrive, plenty of free RAM
> - vanilla Linux 2.6.31, Kubuntu 9.10 packages, all software 64-bit
> 
> 
> How to reproduce:
> - start KDE/GNOME-session
> - open a terminal window and do as a non-root user:
>   dd if=/dev/zero of=/home/john-doe/testfile
>   (or dd if=/home/john-doe/big-testfile of=/dev/null)
> 
> - a real use scenario would be a daily disk-backup or the
>   simple extraction of a tarball containing slightly bigger files
> 
> 
> Observation:
> - The system becomes _really_ slow as described above; unusable for
>   any multimedia tasks.

I guess that switching from CFQ to deadline I/O scheduler improves the 
situation, right?

-- 
Jiri Kosina
SUSE Labs, Novell Inc.

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