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bz31
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PostPosted: Sun Oct 23, 2005 2:14 pm    Post subject: Reply with quote

What about the new CONFIG_PREEMPT_VOLUNTARY ?
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JoseJX
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PostPosted: Sun Oct 23, 2005 2:47 pm    Post subject: Reply with quote

nightmorph: No, this is PPC specific.

bz31: I haven't really tested it enough to know for sure, I can usually trigger it with a kdelibs build though, you're more than welcome to give it a try. :)
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bz31
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PostPosted: Sun Oct 23, 2005 2:59 pm    Post subject: Reply with quote

I use the option CONFIG_PREEMPT_VOLUNTARY=y since the 2.6.13-rc1, it seems to me it works fine.
I would like to know if this option is useful for ppc (if it works without problem).
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stimuli
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PostPosted: Tue Oct 25, 2005 6:14 am    Post subject: Reply with quote

Well, test it and get back to us ;)
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Massimo B.
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PostPosted: Thu Dec 22, 2005 2:15 pm    Post subject: Reply with quote

bz31 wrote:
I use the option CONFIG_PREEMPT_VOLUNTARY=y since the 2.6.13-rc1, it seems to me it works fine.
Any news? This sounds interesting. That would be one advantage of a 2.6.14 kernel.
I tried some while ago SMP+preemption but didn't notice a difference.

"Better" Desktop performance and response would be nice, since I found nice games like open transport tycoon which stresses my G3.
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JoseJX
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PostPosted: Fri Dec 23, 2005 5:50 am    Post subject: Reply with quote

2.6.15 should include additional PPC preempt fixes and may actually fix the cache corruption we were seeing before. I wouldn't try it on an earlier kernel, but if you feel like trying preempt, please use the latest 2.6.15 kernel.
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gringo
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PostPosted: Fri Dec 23, 2005 2:51 pm    Post subject: Reply with quote

Quote:
2.6.15 should include additional PPC preempt fixes and may actually fix the cache corruption we were seeing before. I wouldn't try it on an earlier kernel, but if you feel like trying preempt, please use the latest 2.6.15 kernel.


thanx for the advice, i have been using it for a while too without noticing anything except that big compiles break.

cheers
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Massimo B.
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PostPosted: Sun Feb 05, 2006 11:08 pm    Post subject: Reply with quote

I have successfully done some minor compiles now. I notice that I can still move the mouse while heavy load of a mplayer for example. I hoped that DVD playback get's smoother with preemptive but it's still a little bit choppy.
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JoseJX
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PostPosted: Mon Feb 06, 2006 5:50 am    Post subject: Reply with quote

The patches didn't help, preempt is still broken in 2.6.15. If you have trouble, that's the first thing I'd turn off. :p
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spool
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PostPosted: Sun Feb 12, 2006 11:59 pm    Post subject: What preemption is for Reply with quote

The original post essentially asked what preemption is for, and the answer is: audio recording. Programs like ardour require a low latency environment for optimum recording quality, and while OSX has very low latency by default, there have been some issues with latency and linux in the past. I don't quite understand, but I think it had some security problems.

These have largely been solved in x86 world, but apparently PPC's have had a cache corruption issue, or at least have had in the past. I have been running a preempted kernel (gentoo-sources-rc[1,3,5]) for a month now, with no segfaults.

hope that's useful
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