From: Zilvinas Valinskas <zilvinas@gemtek.lt>
To: Helge Hafting <helge.hafting@hist.no>
Cc: Jeff Garzik <jgarzik@pobox.com>,
Lee Revell <rlrevell@joe-job.com>,
Ricky Beam <jfbeam@bluetronic.net>,
Erik Tews <erik@debian.franken.de>,
linux-kernel mailing list <linux-kernel@vger.kernel.org>
Subject: Re: 2.6.9 rc2 freezing
Date: Fri, 17 Sep 2004 11:05:04 +0300 [thread overview]
Message-ID: <20040917080503.GA7634@gemtek.lt> (raw)
In-Reply-To: <4149512E.9040005@hist.no>
On Thu, Sep 16, 2004 at 10:39:10AM +0200, Helge Hafting wrote:
> Jeff Garzik wrote:
>
> >Lee Revell wrote:
> >
> >>Interesting. Still, this looks like a specific bug that needs fixing,
> >>it doesn't imply that preemption is a hack. For many workloads
> >>preemption is a necessity.
> >
> >
> >
> >For any workload that you feel preemption is a necessity, that
> >indicates a latency problem in the kernel that should be solved.
> >
> >Preemption is a hack that hides broken drivers, IMHO.
> >
> >I would rather directly address any latency problems that appear.
>
> Current preempt is broken, sure. But having robust preempt
> would allow code simplification. Long loops outside critical
> sections would be ok - no time or code spent testing for a need for
> rescheduling because you'll be preempted when necessary anyway.
Could be the case. This morning I've turned off PREEMPT support in
linux 2.6.9-rc2 kernel, booted just fine, ran apt-get update ... it
seemed everything is ok.
Then setup IPsec policies, ping remote end, racoon has tried to negotiate
with a remote end and ... laptop freezes again (this time without
PREEMPT).
At a time I was in X, couldn't capture the OOPS, after reboot
/var/log/kern.log is empty ... :(
Doesn't seem it is PREEMPT related I think now.
>
> Or am I missing something? Other than that current preempt isn't up to
> this and might be hard to get there?
>
> Helge Hafting
>
>
> -
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next prev parent reply other threads:[~2004-09-17 8:06 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-09-13 16:55 2.6.9 rc2 freezing Zilvinas Valinskas
2004-09-13 17:12 ` Jeff Garzik
2004-09-13 17:16 ` Zilvinas Valinskas
2004-09-15 8:25 ` Erik Tews
2004-09-15 9:58 ` Zilvinas Valinskas
2004-09-15 14:55 ` Ricky Beam
2004-09-15 15:48 ` Lee Revell
2004-09-15 15:58 ` Jeff Garzik
2004-09-15 16:06 ` Lee Revell
2004-09-15 16:11 ` Jeff Garzik
2004-09-15 16:58 ` Ricky Beam
2004-09-15 17:49 ` Lee Revell
2004-09-15 17:52 ` Jeff Garzik
2004-09-15 17:59 ` Lee Revell
2004-09-16 8:39 ` Helge Hafting
2004-09-17 8:05 ` Zilvinas Valinskas [this message]
2004-09-17 13:21 ` Zilvinas Valinskas
2004-09-15 16:59 ` Dave Jones
2004-09-13 17:19 ` Zilvinas Valinskas
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