[Pkg-xfce-devel] Bug#637631: Bug#637631: Severe RAID0 performance drop after starting xfce4-power-manager

[Yves-Alexis Perez]

On sam., 2011-08-13 at 10:58 +0200, Björn A. Herwig wrote:
> 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.
> 
That looks like a behavior from laptop-mode or upower hooks. Can you
check if they're installed, and if there's log from them when xfpm
starts? Itmight be worth running xfpm from command line with debug
options.

Regards,
-- 
Yves-Alexis
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