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bz31
Tux's lil' helper
Joined: 20 Apr 2005
Posts: 108
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 Posted: Sun Oct 23, 2005 2:14 pm Post subject: |
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| What about the new CONFIG_PREEMPT_VOLUNTARY ? |
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JoseJX
Retired Dev
Joined: 28 Apr 2002
Posts: 2774
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| Posted: Sun Oct 23, 2005 2:47 pm Post subject: |
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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
Tux's lil' helper
Joined: 20 Apr 2005
Posts: 108
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| Posted: Sun Oct 23, 2005 2:59 pm Post subject: |
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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
Apprentice
Joined: 16 Dec 2002
Posts: 292
Location: Dartmouth, NS, Canada
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| Posted: Tue Oct 25, 2005 6:14 am Post subject: |
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Well, test it and get back to us  |
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Massimo B.
Veteran
Joined: 09 Feb 2005
Posts: 1776
Location: PB, Germany
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| Posted: Thu Dec 22, 2005 2:15 pm Post subject: |
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| 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
Retired Dev
Joined: 28 Apr 2002
Posts: 2774
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| Posted: Fri Dec 23, 2005 5:50 am Post subject: |
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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
Advocate
Joined: 27 Apr 2003
Posts: 3793
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| Posted: Fri Dec 23, 2005 2:51 pm Post subject: |
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| 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.
Veteran
Joined: 09 Feb 2005
Posts: 1776
Location: PB, Germany
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| Posted: Sun Feb 05, 2006 11:08 pm Post subject: |
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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
Retired Dev
Joined: 28 Apr 2002
Posts: 2774
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| Posted: Mon Feb 06, 2006 5:50 am Post subject: |
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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
n00b
Joined: 02 Feb 2006
Posts: 26
Location: UK
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| Posted: Sun Feb 12, 2006 11:59 pm Post subject: What preemption is for |
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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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