Your message dated Wed, 31 Aug 2011 14:08:14 +0200
with message-id <1314792498.21369.2.camel@scapa>
and subject line Re: [Pkg-xfce-devel] Bug#637631: sudo touch
/etc/pm/power.d/readahead
has caused the Debian Bug report #637631,
regarding Severe RAID0 performance drop after starting xfce4-power-manager
to be marked as done.
This means that you claim that the problem has been dealt with.
If this is not the case it is now your responsibility to reopen the
Bug report if necessary, and/or fix the problem forthwith.
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637631: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=637631
Debian Bug Tracking System
Contact [email protected] with problems
--- Begin Message ---
Package: xfce4-power-manager
Version: 1.0.10-4
Severity: important
Whenever xfce4-power-manager is started, the RAID0 performance drops severely:
$ sudo hdparm -t /dev/md0
/dev/md0:
Timing buffered disk reads: 624 MB in 3.01 seconds = 207.47 MB/sec
$ xfce4-power-manager
$ sudo hdparm -t /dev/md0
/dev/md0:
Timing buffered disk reads: 452 MB in 3.01 seconds = 150.33 MB/sec
Furthermore it seems that the rootfs gets remounted showing the following line
in dmesg:
[ 36.443770] EXT4-fs (sda1): re-mounted. Opts:
discard,errors=remount-ro,commit=0
The problem shows on two of my systems, both running an up-to-date Testing
with EXT4 rootfs on SSD and /home with XFS on RAID0 (via device-mapper) HDDs.
The performance is only regained after reboot, stopping xfce4-power-manager
has no effect.
Changing "spin-down-on-ac"
in .config/xfce4/xfconf/xfce-perchannel-xml/xfce4-power-manager.xml has no
effect, too.
The performance drop could be related to AAM, as I get the same drop when
setting "hdparm -M128" for the RAID disks.
As an interim solution I removed xfce4-power-manager from autostart.
Best,
Björn
--- End Message ---
--- Begin Message ---
On jeu., 2011-08-18 at 19:52 +0200, Björn A. Herwig wrote:
> > > There might be some way to setup pm-utils to not do anything on this
> > > raid array.
> >
> > Yeah, read the manpage for pm-powersave.
>
> sudo touch /etc/pm/power.d/readahead
>
> That solved the issue! Thanks!
>
> > > I'm not exactly sure how it's related to xfpm, but the fact
> > > that the “spin down disk on ac” setting didn't work, there might be a
> > > bug there, which I'll try to investigate.
> >
> > Though it might just be that starting xfpm “pings” upower about the
> > system state and that it somehow activates the powersave mode (not sure
> > why though).
>
> No, it's calling the scipts with "false" as parameter, which means "tune for
> performance". Though the readahead script has a negative impact on my RAID0.
>
> > Regards,
Closing.
--
Yves-Alexis
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