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Re: [PATCH] scheduler: fix x86 regression in native_sched_clock

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From: Ingo Molnar <mingo@...>
To: Mark Lord <lkml@...>
Cc: Guillaume Chazarain <guichaz@...>, <stefano.brivio@...>, Nick Piggin <nickpiggin@...>, Robert Love <rml@...>, <linux-kernel@...>, Dave Jones <davej@...>, Rafael J. Wysocki <rjw@...>, Michael Buesch <mb@...>, Thomas Gleixner <tglx@...>, Andrew Morton <akpm@...>, Len Brown <lenb@...>
Subject: Re: [PATCH] scheduler: fix x86 regression in native_sched_clock
Date: Saturday, December 8, 2007 - 11:13 am

* Mark Lord <lkml@rtr.ca> wrote:


no, it cannot affect jiffies. (jiffies was a red herring all along)

udelay() cannot be affected either - sched_clock() has no effect on 
udelay(). _But_, when there are TSC problems then tsc based udelay() 
suffers too so the phenomenons may _seem_ related.


iirc these high rate wakeups happened on 2.6.22 too.

	Ingo
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Messages in current thread:
[PATCH] scheduler: fix x86 regression in native_sched_clock, Stefano Brivio, (Thu Dec 6, 9:19 pm)
Re: [PATCH] scheduler: fix x86 regression in native_sched_cl..., Thomas Gleixner, (Fri Dec 7, 1:51 am)
Re: [PATCH] scheduler: fix x86 regression in native_sched_cl..., Andi Kleen, (Fri Dec 7, 6:37 am)
Re: [PATCH] scheduler: fix x86 regression in native_sched_cl..., Guillaume Chazarain, (Fri Dec 7, 3:18 am)
Re: [PATCH] scheduler: fix x86 regression in native_sched_cl..., Guillaume Chazarain, (Fri Dec 7, 4:02 am)
[patch] x86: scale cyc_2_nsec according to CPU frequency, Ingo Molnar, (Fri Dec 7, 9:55 am)
Re: [patch] x86: scale cyc_2_nsec according to CPU frequency, Guillaume Chazarain, (Fri Dec 7, 10:27 am)
Re: [patch] x86: scale cyc_2_nsec according to CPU frequency, Ingo Molnar, (Fri Dec 7, 10:52 am)
Re: [patch] x86: scale cyc_2_nsec according to CPU frequency, Arjan van de Ven, (Sat Dec 8, 11:57 am)
Re: [patch] x86: scale cyc_2_nsec according to CPU frequency, Ingo Molnar, (Sat Dec 8, 3:16 pm)
Re: [patch] x86: scale cyc_2_nsec according to CPU frequency, Arjan van de Ven, (Sat Dec 8, 4:18 pm)
Re: [PATCH] scheduler: fix x86 regression in native_sched_cl..., Ingo Molnar, (Fri Dec 7, 4:51 am)
Re: [PATCH] scheduler: fix x86 regression in native_sched_cl..., Guillaume Chazarain, (Fri Dec 7, 5:29 am)
Re: [PATCH] scheduler: fix x86 regression in native_sched_cl..., Ingo Molnar, (Fri Dec 7, 5:59 am)
Re: [PATCH] scheduler: fix x86 regression in native_sched_cl..., Nick Piggin, (Fri Dec 7, 1:29 am)
Re: [PATCH] scheduler: fix x86 regression in native_sched_cl..., Ingo Molnar, (Fri Dec 7, 4:45 am)
Re: [PATCH] scheduler: fix x86 regression in native_sched_cl..., Nick Piggin, (Fri Dec 7, 7:13 am)
Re: [PATCH] scheduler: fix x86 regression in native_sched_cl..., Guillaume Chazarain, (Fri Dec 7, 7:18 am)
Re: [PATCH] scheduler: fix x86 regression in native_sched_cl..., Guillaume Chazarain, (Fri Dec 7, 7:57 am)
Re: [PATCH] scheduler: fix x86 regression in native_sched_cl..., , (Fri Dec 7, 7:23 am)
Re: [PATCH] scheduler: fix x86 regression in native_sched_cl..., Ingo Molnar, (Fri Dec 7, 8:25 am)
Re: [PATCH] scheduler: fix x86 regression in native_sched_cl..., Ingo Molnar, (Fri Dec 7, 8:35 am)
Re: [PATCH] scheduler: fix x86 regression in native_sched_cl..., Ingo Molnar, (Fri Dec 7, 8:40 am)
Re: [PATCH] scheduler: fix x86 regression in native_sched_cl..., Ingo Molnar, (Fri Dec 7, 10:54 am)
Re: [PATCH] scheduler: fix x86 regression in native_sched_cl..., Guillaume Chazarain, (Fri Dec 7, 12:46 pm)
Re: [PATCH] scheduler: fix x86 regression in native_sched_cl..., Ingo Molnar, (Fri Dec 7, 1:57 pm)
Re: [PATCH] scheduler: fix x86 regression in native_sched_cl..., Mark Lord, (Sat Dec 8, 11:06 am)
Re: [PATCH] scheduler: fix x86 regression in native_sched_cl..., Ingo Molnar, (Sat Dec 8, 11:13 am)
Re: [PATCH] scheduler: fix x86 regression in native_sched_cl..., Michael Buesch, (Sat Dec 8, 11:27 am)
Re: [PATCH] scheduler: fix x86 regression in native_sched_cl..., Ingo Molnar, (Sat Dec 8, 11:33 am)
Re: [PATCH] scheduler: fix x86 regression in native_sched_cl..., Michael Buesch, (Sat Dec 8, 11:36 am)
Re: [PATCH] scheduler: fix x86 regression in native_sched_cl..., Ingo Molnar, (Sat Dec 8, 11:41 am)
Re: [PATCH] scheduler: fix x86 regression in native_sched_cl..., Ingo Molnar, (Fri Dec 7, 8:11 am)
Re: [PATCH] scheduler: fix x86 regression in native_sched_cl..., Ingo Molnar, (Fri Dec 7, 7:24 am)
Re: [PATCH] scheduler: fix x86 regression in native_sched_cl..., Ingo Molnar, (Fri Dec 7, 7:17 am)
Re: [PATCH] scheduler: fix x86 regression in native_sched_cl..., Nick Piggin, (Fri Dec 7, 12:48 pm)
Re: [PATCH] scheduler: fix x86 regression in native_sched_cl..., Nick Piggin, (Fri Dec 7, 8:50 pm)
Re: [PATCH] scheduler: fix x86 regression in native_sched_cl..., Nick Piggin, (Fri Dec 7, 8:57 pm)
Re: [PATCH] scheduler: fix x86 regression in native_sched_cl..., Ingo Molnar, (Sat Dec 8, 4:52 am)
Re: [PATCH] scheduler: fix x86 regression in native_sched_cl..., Nick Piggin, (Wed Dec 12, 12:42 am)
Re: [PATCH] scheduler: fix x86 regression in native_sched_cl..., Ingo Molnar, (Wed Dec 12, 6:44 am)
Re: [PATCH] scheduler: fix x86 regression in native_sched_cl..., Guillaume Chazarain, (Sat Dec 8, 7:37 pm)
Re: [PATCH] scheduler: fix x86 regression in native_sched_cl..., Andrew Morton, (Fri Dec 7, 6:32 am)
Re: [PATCH] scheduler: fix x86 regression in native_sched_cl..., Ingo Molnar, (Fri Dec 7, 6:40 am)
Re: [PATCH] scheduler: fix x86 regression in native_sched_cl..., Ingo Molnar, (Fri Dec 7, 7:07 am)
Re: [PATCH] scheduler: fix x86 regression in native_sched_cl..., Andrew Morton, (Fri Dec 7, 7:09 am)
Re: [PATCH] scheduler: fix x86 regression in native_sched_cl..., Ingo Molnar, (Fri Dec 7, 7:12 am)