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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20090920220405.GA395@duck.suse.cz>
Date:	Mon, 21 Sep 2009 00:04:05 +0200
From:	Jan Kara <jack@...e.cz>
To:	Jiri Kosina <jkosina@...e.cz>
Cc:	Ulrich Lukas <stellplatz-nr.13a@...enparkplatz.de>,
	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 20-09-09 22:22:20, Jiri Kosina wrote:
> 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?
  For example on my desktop, switching to deadline slightly improves the
situation but the machine is still mostly unusable while dd is running...
I'll try to debug it some more to see whether it can be somehow helped.

								Honza
-- 
Jan Kara <jack@...e.cz>
SUSE Labs, CR
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/