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Re: 2.6.21-rc1: known regressions (v2) (part 2)

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To: Ingo Molnar <mingo@...>
Cc: Mike Galbraith <efault@...>, Michal Piotrowski <michal.k.k.piotrowski@...>, Thomas Gleixner <tglx@...>, Adrian Bunk <bunk@...>, Linus Torvalds <torvalds@...>, Andrew Morton <akpm@...>, <linux-kernel@...>
Date: Thursday, March 1, 2007 - 7:13 am

On Thursday 01 March 2007 19:46, Ingo Molnar wrote:

Well it is meant to be tuned to the cpu type in per_cpu_gain. So it should be 
easy to be set to the appropriate scaling. It was never meant to be a one 
value fits all as the processors changed.


Yes even I've commented before that this current system is unworkable come 
multiple shared power threads. This I do see as a real problem with it - in 
the future.


And that's the depressing part because of course I was interested in that as 
the original approach to the problem (and it was a big problem). When I spoke 
to Intel and AMD (of course to date no SMT AMD chip exists) at kernel summit 
they said it was too hard to implement hardware priorities well. Which is 
real odd since IBM have already done it with Power...

Still I think it has been working fine in software till now, but now it has to 
deal with the added confusion of dynticks, so I already know what will happen 
to it.

Hrm it's been a good time for my code all round... I think I'll just swap 
prefetch myself up the staircase to some pluggable scheduler that would 
hyperthread me to sleep as an idle priority task.

-- 
-ck
-
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Messages in current thread:
Linux 2.6.21-rc1, Linus Torvalds, (Wed Feb 21, 12:53 am)
Re: Linux 2.6.21-rc1, Andreas Schwab, (Wed Feb 21, 2:34 pm)
Re: Linux 2.6.21-rc1, Dave Jones, (Wed Feb 21, 2:40 pm)
2.6.21-rc1: known regressions (v2) (part 2), Adrian Bunk, (Mon Feb 26, 6:05 pm)
Re: 2.6.21-rc1: known regressions (v2) (part 2), Thomas Gleixner, (Tue Feb 27, 4:21 am)
Re: 2.6.21-rc1: known regressions (v2) (part 2), Michal Piotrowski, (Tue Feb 27, 4:33 am)
Re: 2.6.21-rc1: known regressions (v2) (part 2), Michal Piotrowski, (Tue Feb 27, 4:35 am)
Re: 2.6.21-rc1: known regressions (v2) (part 2), Ingo Molnar, (Tue Feb 27, 4:33 am)
Re: 2.6.21-rc1: known regressions (v2) (part 2), Mike Galbraith, (Tue Feb 27, 4:54 am)
Re: 2.6.21-rc1: known regressions (v2) (part 2), Con Kolivas, (Tue Feb 27, 7:07 pm)
Re: 2.6.21-rc1: known regressions (v2) (part 2), Mike Galbraith, (Wed Feb 28, 12:21 am)
Re: 2.6.21-rc1: known regressions (v2) (part 2), Con Kolivas, (Wed Feb 28, 6:01 pm)
Re: 2.6.21-rc1: known regressions (v2) (part 2), Mike Galbraith, (Wed Feb 28, 8:02 pm)
Re: 2.6.21-rc1: known regressions (v2) (part 2), Ingo Molnar, (Thu Mar 1, 4:46 am)
Re: 2.6.21-rc1: known regressions (v2) (part 2), Con Kolivas, (Thu Mar 1, 7:13 am)
Re: 2.6.21-rc1: known regressions (v2) (part 2), Thomas Gleixner, (Thu Mar 1, 7:33 am)
Re: 2.6.21-rc1: known regressions (v2) (part 2), Con Kolivas, (Thu Mar 1, 8:05 am)
Re: 2.6.21-rc1: known regressions (v2) (part 2), Ingo Molnar, (Thu Mar 1, 9:30 am)
Re: 2.6.21-rc1: known regressions (v2) (part 2), Con Kolivas, (Thu Mar 1, 5:51 pm)
[PATCH] sched: remove SMT nice, Con Kolivas, (Thu Mar 1, 6:33 pm)
Re: 2.6.21-rc1: known regressions (v2) (part 2), Thomas Gleixner, (Thu Mar 1, 8:20 am)
2.6.21-rc1: known regressions (v2) (part 1), Adrian Bunk, (Mon Feb 26, 6:01 pm)
Re: 2.6.21-rc1: known regressions (v2) (part 1), Meelis Roos, (Tue Feb 27, 9:00 am)
Re: 2.6.21-rc1: known regressions (v2) (part 1), Michael S. Tsirkin, (Wed Feb 28, 5:13 pm)
Re: 2.6.21-rc1: known regressions (v2) (part 1), Jeff Chua, (Wed Feb 28, 11:45 pm)
Re: 2.6.21-rc1: known regressions (v2) (part 1), Adrian Bunk, (Sun Mar 4, 8:04 pm)
Re: 2.6.21-rc1: known regressions (v2) (part 1), Jeff Chua, (Mon Mar 5, 9:32 pm)
Re: 2.6.21-rc1: known regressions (v2) (part 1), Jeff Chua, (Tue Mar 6, 8:03 am)
Re: 2.6.21-rc1: known regressions (v2) (part 1), Michael S. Tsirkin, (Tue Mar 6, 8:08 am)
Re: 2.6.21-rc1: known regressions (v2) (part 1), Jeff Chua, (Tue Mar 6, 8:12 am)
Re: 2.6.21-rc1: known regressions (v2) (part 1), Pavel Machek, (Mon Mar 19, 11:32 am)
Re: 2.6.21-rc1: known regressions (v2) (part 1), Rafael J. Wysocki, (Mon Mar 19, 5:23 pm)
Re: 2.6.21-rc1: known regressions (v2) (part 1), Thomas Gleixner, (Wed Feb 28, 5:27 pm)
Re: 2.6.21-rc1: known regressions (v2) (part 1), Michael S. Tsirkin, (Wed Feb 28, 5:40 pm)
2.6.21-rc1: known regressions (part 3), Adrian Bunk, (Sun Feb 25, 2:02 pm)
Re: 2.6.21-rc1: known regressions (part 3), Greg KH, (Sun Feb 25, 4:59 pm)
2.6.21-rc1: known regressions (part 2), Adrian Bunk, (Sun Feb 25, 1:55 pm)
Re: 2.6.21-rc1: known regressions (part 2), Jens Axboe, (Tue Feb 27, 6:02 am)
Re: 2.6.21-rc1: known regressions (part 2), Adrian Bunk, (Tue Feb 27, 6:09 pm)
Re: 2.6.21-rc1: known regressions (part 2), Jens Axboe, (Wed Feb 28, 3:41 am)
Re: 2.6.21-rc1: known regressions (part 2), Pavel Machek, (Tue Feb 27, 6:21 am)
Re: 2.6.21-rc1: known regressions (part 2), Jens Axboe, (Tue Feb 27, 6:30 am)
Re: 2.6.21-rc1: known regressions (part 2), Ingo Molnar, (Tue Feb 27, 6:34 am)
Re: 2.6.21-rc1: known regressions (part 2), Jens Axboe, (Tue Feb 27, 6:59 am)
Re: 2.6.21-rc1: known regressions (part 2), Jens Axboe, (Tue Feb 27, 7:15 am)
Re: 2.6.21-rc1: known regressions (part 2), Ingo Molnar, (Thu Mar 1, 5:34 am)
Re: 2.6.21-rc1: known regressions (part 2), Michael S. Tsirkin, (Mon Mar 5, 11:34 am)
Re: 2.6.21-rc1: known regressions (part 2), Pavel Machek, (Fri Mar 2, 6:07 am)
Re: 2.6.21-rc1: known regressions (part 2), Michael S. Tsirkin, (Mon Mar 5, 4:42 am)
Re: [linux-pm] 2.6.21-rc1: known regressions (part 2), Pavel Machek, (Fri Mar 9, 2:44 am)
SATA resume slowness, e1000 MSI warning, Ingo Molnar, (Mon Mar 5, 6:11 am)
Re: SATA resume slowness, e1000 MSI warning, Thomas Gleixner, (Tue Mar 6, 12:26 pm)
Re: SATA resume slowness, e1000 MSI warning, Linus Torvalds, (Tue Mar 6, 12:52 pm)
Re: SATA resume slowness, e1000 MSI warning, Kok, Auke, (Tue Mar 6, 1:09 pm)
Re: SATA resume slowness, e1000 MSI warning, Ingo Molnar, (Tue Mar 6, 5:06 am)
Re: SATA resume slowness, e1000 MSI warning, Jeff Garzik, (Tue Mar 6, 1:30 am)
Re: SATA resume slowness, e1000 MSI warning, Kok, Auke, (Tue Mar 6, 2:35 am)
Re: SATA resume slowness, e1000 MSI warning, Ingo Molnar, (Tue Mar 6, 5:04 am)
Re: SATA resume slowness, e1000 MSI warning, Kok, Auke, (Tue Mar 6, 11:34 am)
Re: SATA resume slowness, e1000 MSI warning, Eric W. Biederman, (Wed Mar 7, 12:15 am)
Re: SATA resume slowness, e1000 MSI warning, Kok, Auke, (Wed Mar 7, 12:31 pm)
Re: SATA resume slowness, e1000 MSI warning, Kok, Auke, (Wed Mar 7, 12:45 pm)
Re: SATA resume slowness, e1000 MSI warning, Eric W. Biederman, (Wed Mar 7, 3:28 pm)
Re: SATA resume slowness, e1000 MSI warning, Kok, Auke, (Fri Mar 9, 7:06 pm)
Re: SATA resume slowness, e1000 MSI warning, Eric W. Biederman, (Fri Mar 9, 11:41 pm)
Re: SATA resume slowness, e1000 MSI warning, Andrew Morton, (Wed Mar 7, 10:53 pm)
Re: SATA resume slowness, e1000 MSI warning, Eric W. Biederman, (Thu Mar 8, 2:58 am)
Re: SATA resume slowness, e1000 MSI warning, Michael S. Tsirkin, (Thu Mar 8, 6:23 am)
Re: SATA resume slowness, e1000 MSI warning, Eric W. Biederman, (Sun Mar 11, 7:11 am)
Re: SATA resume slowness, e1000 MSI warning, Michael S. Tsirkin, (Sun Mar 11, 7:24 am)
Re: SATA resume slowness, e1000 MSI warning, Michael S. Tsirkin, (Mon Apr 16, 3:56 pm)
Re: SATA resume slowness, e1000 MSI warning, Eric W. Biederman, (Sun Mar 11, 1:37 pm)
Re: SATA resume slowness, e1000 MSI warning, Michael S. Tsirkin, (Sun Mar 11, 2:03 pm)
Re: SATA resume slowness, e1000 MSI warning, Eric W. Biederman, (Sun Mar 11, 2:27 pm)
Re: SATA resume slowness, e1000 MSI warning, Michael S. Tsirkin, (Sun Mar 11, 2:37 pm)
Re: SATA resume slowness, e1000 MSI warning, Eric W. Biederman, (Sun Mar 11, 3:50 pm)
Re: SATA resume slowness, e1000 MSI warning, Michael S. Tsirkin, (Mon Mar 12, 12:35 am)
Re: SATA resume slowness, e1000 MSI warning, Jeff Garzik, (Thu Mar 8, 5:55 am)
Re: SATA resume slowness, e1000 MSI warning, Eric W. Biederman, (Thu Mar 8, 1:27 pm)
[PATCH 1/2] msi: Safer state caching., Eric W. Biederman, (Thu Mar 8, 4:04 pm)
Re: 2.6.21-rc1: known regressions (part 2), Ingo Molnar, (Thu Mar 1, 6:41 am)
Re: 2.6.21-rc1: known regressions (part 2), Linus Torvalds, (Thu Mar 1, 7:36 pm)
Re: 2.6.21-rc1: known regressions (part 2), Ingo Molnar, (Thu Mar 1, 10:52 am)
Re: 2.6.21-rc1: known regressions (part 2), Linus Torvalds, (Thu Mar 1, 8:26 pm)
Re: 2.6.21-rc1: known regressions (part 2), Linus Torvalds, (Thu Mar 1, 8:41 pm)
Re: 2.6.21-rc1: known regressions (part 2), Ingo Molnar, (Fri Mar 2, 3:21 am)
Re: 2.6.21-rc1: known regressions (part 2), Ingo Molnar, (Fri Mar 2, 4:04 am)
Re: 2.6.21-rc1: known regressions (part 2), Michael S. Tsirkin, (Mon Mar 5, 12:14 pm)
Re: 2.6.21-rc1: known regressions (part 2), Jens Axboe, (Mon Mar 5, 2:16 pm)
Re: 2.6.21-rc1: known regressions (part 2), Ingo Molnar, (Mon Mar 5, 12:41 pm)
Re: 2.6.21-rc1: known regressions (part 2), Michael S. Tsirkin, (Mon Mar 5, 11:44 am)
Re: 2.6.21-rc1: known regressions (part 2), Ingo Molnar, (Fri Mar 2, 6:20 am)
[patch] KVM: T60 resume fix, Ingo Molnar, (Fri Mar 2, 6:22 am)
Re: [patch] KVM: T60 resume fix, Avi Kivity, (Sat Mar 3, 4:21 am)
Re: [patch] KVM: T60 resume fix, Ingo Molnar, (Mon Mar 5, 4:22 am)
Re: [patch] KVM: T60 resume fix, Avi Kivity, (Mon Mar 5, 4:50 am)
Re: [patch] KVM: T60 resume fix, Ingo Molnar, (Mon Mar 5, 4:44 am)
Re: [patch] KVM: T60 resume fix, Ingo Molnar, (Mon Mar 5, 4:57 am)
Re: [patch] KVM: T60 resume fix, Avi Kivity, (Mon Mar 5, 5:27 am)
Re: [patch] KVM: T60 resume fix, Ingo Molnar, (Mon Mar 5, 6:05 am)
Re: [patch] KVM: T60 resume fix, Avi Kivity, (Mon Mar 5, 6:33 am)
Re: [patch] KVM: T60 resume fix, Michael S. Tsirkin, (Mon Mar 5, 6:40 am)
Re: [patch] KVM: T60 resume fix, Ingo Molnar, (Mon Mar 5, 6:33 am)
Re: [patch] KVM: T60 resume fix, Michael S. Tsirkin, (Mon Mar 5, 8:54 am)
Re: [patch] KVM: T60 resume fix, Ingo Molnar, (Mon Mar 5, 8:50 am)
Re: [patch] KVM: T60 resume fix, Michael S. Tsirkin, (Mon Mar 5, 9:26 am)
Re: [patch] KVM: T60 resume fix, Ingo Molnar, (Mon Mar 5, 9:32 am)
Re: [patch] KVM: T60 resume fix, Andrew Morton, (Sat Mar 3, 7:57 am)
Re: [patch] KVM: T60 resume fix, Junio C Hamano, (Sat Mar 3, 8:07 am)
Re: [patch] KVM: T60 resume fix, Michael S. Tsirkin, (Mon Mar 5, 6:23 am)
Re: [patch] KVM: T60 resume fix, Ingo Molnar, (Mon Mar 5, 6:29 am)
Re: [patch] KVM: T60 resume fix, Michael S. Tsirkin, (Fri Mar 2, 7:39 am)
Re: [patch] KVM: T60 resume fix, Avi Kivity, (Sat Mar 3, 4:22 am)
Re: 2.6.21-rc1: known regressions (part 2), Ingo Molnar, (Fri Mar 2, 3:14 am)
Re: 2.6.21-rc1: known regressions (part 2), Rafael J. Wysocki, (Thu Mar 1, 12:12 pm)
Re: 2.6.21-rc1: known regressions (part 2), Jens Axboe, (Tue Feb 27, 9:09 am)
2.6.21-rc1: known regressions (part 1), Adrian Bunk, (Sun Feb 25, 1:52 pm)
RE: 2.6.21-rc1: known regressions (part 1), Karasyov, Konstantin A, (Wed Feb 28, 2:16 pm)
regression: forcedeth.c hang, Ingo Molnar, (Tue Feb 27, 4:39 am)
Re: regression: forcedeth.c hang, Ingo Molnar, (Tue Feb 27, 5:01 am)
Re: regression: forcedeth.c hang, Ingo Molnar, (Tue Feb 27, 5:38 am)
Re: regression: forcedeth.c hang, Ingo Molnar, (Tue Feb 27, 7:25 am)
Re: regression: forcedeth.c hang, Linus Torvalds, (Tue Feb 27, 11:42 am)
Re: regression: forcedeth.c hang, Ingo Molnar, (Wed Feb 28, 3:36 am)
Re: Linux 2.6.21-rc1 -- suspend, Pavel Machek, (Fri Feb 23, 1:25 am)
request_module: runaway loop modprobe net-pf-1 (is Re: Linux..., YOSHIFUJI Hideaki / , (Wed Feb 21, 12:23 pm)
NO_HZ: timer interrupt stuck [Re: Linux 2.6.21-rc1], Luca Tettamanti, (Wed Feb 21, 7:04 pm)
Re: NO_HZ: timer interrupt stuck [Re: Linux 2.6.21-rc1], Thomas Gleixner, (Wed Feb 21, 7:17 pm)
Re: NO_HZ: timer interrupt stuck [Re: Linux 2.6.21-rc1], Jan Engelhardt, (Thu Feb 22, 8:36 am)
Re: NO_HZ: timer interrupt stuck [Re: Linux 2.6.21-rc1], Thomas Gleixner, (Thu Feb 22, 11:51 am)
Re: NO_HZ: timer interrupt stuck, David Miller, (Thu Feb 22, 1:26 pm)
Re: NO_HZ: timer interrupt stuck, Andi Kleen, (Fri Feb 23, 11:50 am)
Re: NO_HZ: timer interrupt stuck, Thomas Gleixner, (Thu Feb 22, 1:39 pm)
Re: NO_HZ: timer interrupt stuck, David Miller, (Fri Feb 23, 5:25 am)
Re: sparc generic time / clockevents, David Miller, (Fri Feb 23, 5:55 am)
Re: sparc generic time / clockevents, john stultz, (Fri Feb 23, 3:51 pm)
Re: sparc generic time / clockevents, Peter Keilty, (Fri Feb 23, 6:15 pm)
Re: sparc generic time / clockevents, David Miller, (Fri Feb 23, 8:34 pm)
Re: sparc generic time / clockevents, john stultz, (Fri Feb 23, 8:53 pm)
Re: sparc generic time / clockevents, David Miller, (Sat Feb 24, 1:52 am)
Re: NO_HZ: timer interrupt stuck [Re: Linux 2.6.21-rc1], Arjan van de Ven, (Thu Feb 22, 9:25 am)
Re: NO_HZ: timer interrupt stuck [Re: Linux 2.6.21-rc1], Pierre Ossman, (Thu Feb 22, 10:10 am)
Re: NO_HZ: timer interrupt stuck [Re: Linux 2.6.21-rc1], Arjan van de Ven, (Thu Feb 22, 10:20 am)
Re: NO_HZ: timer interrupt stuck [Re: Linux 2.6.21-rc1], Pierre Ossman, (Thu Feb 22, 10:51 am)
Re: NO_HZ: timer interrupt stuck [Re: Linux 2.6.21-rc1], Pierre Ossman, (Thu Feb 22, 11:13 am)
Re: NO_HZ: timer interrupt stuck [Re: Linux 2.6.21-rc1], Thomas Gleixner, (Thu Feb 22, 12:00 pm)
RE: NO_HZ: timer interrupt stuck [Re: Linux 2.6.21-rc1], Pallipadi, Venkatesh, (Thu Feb 22, 3:58 pm)
Re: NO_HZ: timer interrupt stuck [Re: Linux 2.6.21-rc1], Pierre Ossman, (Thu Feb 22, 12:27 pm)
Re: NO_HZ: timer interrupt stuck [Re: Linux 2.6.21-rc1], Arjan van de Ven, (Thu Feb 22, 12:42 pm)
Re: NO_HZ: timer interrupt stuck [Re: Linux 2.6.21-rc1], Pierre Ossman, (Thu Feb 22, 5:07 pm)
Re: NO_HZ: timer interrupt stuck [Re: Linux 2.6.21-rc1], Andreas Mohr, (Thu Feb 22, 5:25 pm)
Re: NO_HZ: timer interrupt stuck [Re: Linux 2.6.21-rc1], Arjan van de Ven, (Thu Feb 22, 6:21 pm)
Re: NO_HZ: timer interrupt stuck [Re: Linux 2.6.21-rc1], Pierre Ossman, (Fri Feb 23, 2:55 am)
Re: NO_HZ: timer interrupt stuck [Re: Linux 2.6.21-rc1], Luca Tettamanti, (Wed Feb 21, 7:19 pm)
Re: Linux 2.6.21-rc1, Faik Uygur, (Wed Feb 21, 9:26 am)
Re: Linux 2.6.21-rc1, Linus Torvalds, (Wed Feb 21, 3:19 pm)
Re: Linux 2.6.21-rc1, Jiri Slaby, (Wed Feb 21, 2:41 pm)
Re: Linux 2.6.21-rc1, Jiri Slaby, (Wed Feb 21, 2:51 pm)
Re: Linux 2.6.21-rc1, Daniel Walker, (Wed Feb 21, 12:24 pm)
Re: Linux 2.6.21-rc1, Thomas Gleixner, (Wed Feb 21, 1:07 pm)
Re: Linux 2.6.21-rc1, Daniel Walker, (Wed Feb 21, 1:19 pm)
Re: Linux 2.6.21-rc1, Thomas Gleixner, (Wed Feb 21, 1:41 pm)
Re: Linux 2.6.21-rc1, Andrew Morton, (Fri Feb 23, 6:08 am)
Re: Linux 2.6.21-rc1, Ingo Molnar, (Fri Feb 23, 7:35 am)
Re: Linux 2.6.21-rc1, Ingo Molnar, (Fri Feb 23, 7:39 am)
Re: Linux 2.6.21-rc1, Thomas Gleixner, (Fri Feb 23, 7:47 am)
Re: Linux 2.6.21-rc1, Daniel Walker, (Wed Feb 21, 1:38 pm)
Re: Linux 2.6.21-rc1, Thomas Gleixner, (Wed Feb 21, 2:18 pm)
Re: Linux 2.6.21-rc1, Daniel Walker, (Wed Feb 21, 2:23 pm)
Re: Linux 2.6.21-rc1, Thomas Gleixner, (Wed Feb 21, 3:23 pm)
Re: Linux 2.6.21-rc1, Daniel Walker, (Wed Feb 21, 4:00 pm)
Re: Linux 2.6.21-rc1, Linus Torvalds, (Wed Feb 21, 4:18 pm)
Re: Linux 2.6.21-rc1, Thomas Gleixner, (Wed Feb 21, 4:43 pm)
Re: Linux 2.6.21-rc1, Daniel Walker, (Wed Feb 21, 4:49 pm)
Re: Linux 2.6.21-rc1, Linus Torvalds, (Wed Feb 21, 5:06 pm)
Re: Linux 2.6.21-rc1 [git bisect], Pete Harlan, (Wed Feb 21, 6:05 pm)
Re: Linux 2.6.21-rc1, Daniel Walker, (Wed Feb 21, 5:23 pm)
Re: Linux 2.6.21-rc1, Thomas Gleixner, (Wed Feb 21, 5:21 pm)
Re: Linux 2.6.21-rc1, Daniel Walker, (Wed Feb 21, 3:24 pm)
Re: Linux 2.6.21-rc1, Thomas Gleixner, (Wed Feb 21, 9:32 am)
Re: Linux 2.6.21-rc1, Kok, Auke, (Wed Feb 21, 11:58 am)
Re: Linux 2.6.21-rc1, Linus Torvalds, (Wed Feb 21, 3:24 pm)
Re: Linux 2.6.21-rc1, Andrew Morton, (Wed Feb 21, 3:45 pm)
speck-geostationary