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SubjectRe: [ck] Re: Ten percent test
Date
Am Montag 09 April 2007 schrieb Mike Galbraith:
> On Mon, 2007-04-09 at 07:26 -0400, Ed Tomlinson wrote:
> > On Monday 09 April 2007 01:38, Mike Galbraith wrote:
> > > On Sun, 2007-04-08 at 09:08 -0400, Ed Tomlinson wrote:
> > > > Hi,
> > > >
> > > > I am one of those who have been happily testing Con's patches.
> > > >
> > > > They work better than mainline here.
> > >
> > > (I tried a UP kernel yesterday, and even a single kernel build
> > > would make noticeable hitches if I move a window around. YMMV etc.)
> >
> > Interesting. I run UP amd64, 1000HZ, 1.25G, preempt off (on causes
> > kernel stalls with no messages - but that is another story). I do
> > not notice a single make. When several are running the desktop
> > slows down a bit. I do not have X niced. Wonder why we see such
> > different results?
>
> Probably because with your processor, in general cc1 can get the job
> done faster, as can X. The latency big hit happens when you hit the
> end of the rotation. You simply don't hit it as often as I do. Anyone
> with an old PIII box should hit the wall very quickly indeed. I
> haven't had time to try it here.

Hi!

I am running 2.6.20.7 + sd-0.44 on an IBM ThinkPad T23 that I use as my
Amarok machine[1]. It has a Pentium 3 with 1.13 GHz using ondemand
frequency scaling and XFS as filesystem.

So far music playback has been perfect even when I had it building kernel
packages while wildly clicking around starting apps and then moving the
Amarok window like mad while solid window moving is enabled. Amarok /
xine continued to play the music totally unimpressed of that.

So for me from a users point of view who wants good music playback *no
matter what*, this is already perfect. Also the desktop feels quite
snappy to me. It was only slow on anything I/O bound but thats
understandable IMHO when make-kpkg tar -bzips the kernel source while 20
KDE applications are starting and Amarok plays music.

Should I try any specific tests? This also goes out to anybody else,
especially to you, Con. So if you want me to run some benchmarks, please
tell me. I am not experienced in benchmarking, but if you tell me what to
do, I can try it out. I prefer benchmarks that do not disrupt music
playback, but can run more aggressive benchmarks over night. I think it
might be good to use a benchmark that isn't I/O bound to really test the
scheduler... but as said I am no expert on that and real life loads
usually are I/O bound as well.

Have to have an carefully eye on the harddisk though...

Apr 22 11:51:06 deepdance smartd[3116]: Device: /dev/sda, SMART Prefailure
Attribute: 3 Spin_Up_Time changed from 154 to 150

(well threshold is at 033, so still plenty to go, hope it will take some
time till the next change)

[1] http://martin-steigerwald.de/amarok-machine/ ;)

Regards,
--
Martin 'Helios' Steigerwald - http://www.Lichtvoll.de
GPG: 03B0 0D6C 0040 0710 4AFA B82F 991B EAAC A599 84C7
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