Re: (att. ismail) [announce] [patch] Voluntary Kernel Preemption Patch

Re: (att. ismail) [announce] [patch] Voluntary Kernel Preemption Patch

[Roger Larsson]

> Tested on 2.6.7-bk20, Pentium3 700 mhz, 576 mb RAM
> 
> I did cp -rf big_folder new_folder . Then opened up a gui ftp client
> and music in amarok started to skip like for 2-3 seconds.
> 
> Btw Amarok uses Artsd ( KDE Sound Daemon ) which in turn set to use
> Jack Alsa Backend.

Are you sure that both artsd and jackd is run as RT processes?
artsd needs 'artswrapper' as suid root and option in kconfig enabled.
(never versions of amarok warns the user if this is not the case...)

[You can try to run the same as root to be sure]

But it does sound as a io scheduler problem - but 2-3 seconds!?

/RogerL 

-- 
Roger Larsson
Skellefteå
Sweden

Re: (att. ismail) [announce] [patch] Voluntary Kernel Preemption Patch

[Oswald Buddenhagen]

On Sat, Jul 10, 2004 at 03:03:58PM +0200, Roger Larsson wrote:
> But it does sound as a io scheduler problem - but 2-3 seconds!?
> 
nothing particularly unusual on my system ... when an updatedb or a 'cvs
up' or 'make install' of kde are running i often get hangs of up to 10
seconds (not the sound, though, as xmms with oss output seems less
susceptible to this, but "random" other processes freeze hard for that
time). and with 2.4 ... errm ... 30 seconds are usual, and 60 seconds
are still not exceptional.
for the record: i have 1GB of ram, no swap, and reasonably fast disks
(and yes, udma is enabled ;).

greetings

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Re: (att. ismail) [announce] [patch] Voluntary Kernel Preemption Patch

[ismail dönmez]

I made artswrapper suid root. It's still skipping during cp -rf
big_folder copy operation. Jack is running with --realtime and I use
realtime lsm module to give it realtime capabilities.

doing a modprobe realtime gid=17

where 17 is "audio" group which happens to contain "cartman" user too.

On Sat, 10 Jul 2004 15:03:58 +0200, Roger Larsson
<roger.larsson@norran.net> wrote:
> > Tested on 2.6.7-bk20, Pentium3 700 mhz, 576 mb RAM
> >
> > I did cp -rf big_folder new_folder . Then opened up a gui ftp client
> > and music in amarok started to skip like for 2-3 seconds.
> >
> > Btw Amarok uses Artsd ( KDE Sound Daemon ) which in turn set to use
> > Jack Alsa Backend.
> 
> Are you sure that both artsd and jackd is run as RT processes?
> artsd needs 'artswrapper' as suid root and option in kconfig enabled.
> (never versions of amarok warns the user if this is not the case...)
> 
> [You can try to run the same as root to be sure]
> 
> But it does sound as a io scheduler problem - but 2-3 seconds!?
> 
> /RogerL
> 
> --
> Roger Larsson
> Skellefteå
> Sweden
> -
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