From: Ingo Molnar <mingo@elte.hu>
To: Mark Lord <lkml@rtr.ca>
Cc: Guillaume Chazarain <guichaz@yahoo.fr>,
stefano.brivio@polimi.it, Nick Piggin <nickpiggin@yahoo.com.au>,
Robert Love <rml@tech9.net>,
linux-kernel@vger.kernel.org, Dave Jones <davej@redhat.com>,
"Rafael J. Wysocki" <rjw@sisk.pl>, Michael Buesch <mb@bu3sch.de>,
Thomas Gleixner <tglx@linutronix.de>,
Andrew Morton <akpm@linux-foundation.org>,
Len Brown <lenb@kernel.org>
Subject: Re: [PATCH] scheduler: fix x86 regression in native_sched_clock
Date: Sat, 8 Dec 2007 16:13:41 +0100 [thread overview]
Message-ID: <20071208151341.GA25413@elte.hu> (raw)
In-Reply-To: <475AB2FD.30600@rtr.ca>
* Mark Lord <lkml@rtr.ca> wrote:
> Ingo Molnar wrote:
>> ...
>> thanks. I do get the impression that most of this can/should wait until
>> 2.6.25. The patches look quite dangerous.
> ..
>
> I confess to not really trying hard to understand everything in this
> thread, but the implication seems to be that this bug might affect
> udelay() and possibly jiffies ?
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.
> If so, then fixing it has to be a *must* for 2.6.24, as otherwise
> we'll get all sorts of one-in-while odd driver bugs.. like maybe these
> two for starters:
>
> [Bug 9492] 2.6.24: false double-clicks from USB mouse
> [Bug 9489] 20000+ wake-ups/second in 2.6.24
iirc these high rate wakeups happened on 2.6.22 too.
Ingo
next prev parent reply other threads:[~2007-12-08 15:15 UTC|newest]
Thread overview: 47+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-12-07 1:19 [PATCH] scheduler: fix x86 regression in native_sched_clock Stefano Brivio
2007-12-07 5:29 ` Nick Piggin
2007-12-07 5:51 ` Thomas Gleixner
2007-12-07 7:18 ` Guillaume Chazarain
2007-12-07 8:02 ` Guillaume Chazarain
2007-12-07 8:51 ` Ingo Molnar
2007-12-07 9:29 ` Guillaume Chazarain
2007-12-07 9:59 ` Ingo Molnar
2007-12-07 13:55 ` [patch] x86: scale cyc_2_nsec according to CPU frequency Ingo Molnar
2007-12-07 14:27 ` Guillaume Chazarain
2007-12-07 14:52 ` Ingo Molnar
2007-12-08 15:57 ` Arjan van de Ven
2007-12-08 19:16 ` Ingo Molnar
2007-12-08 20:18 ` Arjan van de Ven
2007-12-07 10:37 ` [PATCH] scheduler: fix x86 regression in native_sched_clock Andi Kleen
2007-12-07 8:45 ` Ingo Molnar
2007-12-07 10:32 ` Andrew Morton
2007-12-07 10:40 ` Ingo Molnar
2007-12-07 11:07 ` Ingo Molnar
2007-12-07 11:09 ` Andrew Morton
2007-12-07 11:12 ` Ingo Molnar
2007-12-07 11:13 ` Nick Piggin
2007-12-07 11:17 ` Ingo Molnar
2007-12-07 16:48 ` Nick Piggin
2007-12-08 0:50 ` Nick Piggin
2007-12-08 0:57 ` Nick Piggin
2007-12-08 8:52 ` Ingo Molnar
2007-12-08 23:37 ` Guillaume Chazarain
2007-12-12 4:42 ` Nick Piggin
2007-12-12 10:44 ` Ingo Molnar
2007-12-07 11:18 ` Guillaume Chazarain
2007-12-07 11:57 ` Guillaume Chazarain
2007-12-07 11:23 ` stefano.brivio
2007-12-07 12:11 ` Ingo Molnar
2007-12-07 12:25 ` Ingo Molnar
2007-12-07 12:35 ` Ingo Molnar
2007-12-07 12:40 ` Ingo Molnar
2007-12-07 14:54 ` Ingo Molnar
2007-12-07 16:46 ` Guillaume Chazarain
2007-12-07 17:57 ` Ingo Molnar
2007-12-08 15:06 ` Mark Lord
2007-12-08 15:13 ` Ingo Molnar [this message]
2007-12-08 15:27 ` Michael Buesch
2007-12-08 15:33 ` Ingo Molnar
2007-12-08 15:36 ` Michael Buesch
2007-12-08 15:41 ` Ingo Molnar
2007-12-07 11:24 ` Ingo Molnar
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