Re: IO-APIC on nforce2 [PATCH] + [PATCH] for nmi_debug=1 + [PATCH]for idle=C1halt, 2.6.5
From: Arjen Verweij
Date: Fri Apr 23 2004 - 04:04:11 EST
He even filed a bug report:
I don't have access to my box atm, but I will certainly be trying a
vanilla kernel built with SMP to see what's going on.
On Fri, 23 Apr 2004, Prakash K. Cheemplavam wrote:
> Len Brown wrote:
> > On Thu, 2004-04-22 at 13:21, Len Brown wrote:
> >>>As for your patch, I get a fast timer, and gain about 1 sec per 5 minutes.
> >>>The only patch that seemed to work without a fast timer so far was the one
> >>>removed by Linus in a testing version. The AN35N has the timer override
> >>Hmm, I didn't notice fast time on my FN41, i'll look for it.
> >>I'm not familiar with the "one removed by Linux in a testing version",
> >>perhaps you could point me to that?
> > date seems to gain 9sec/hour on my Shuttle/SN41G2/FN41 when using IOAPIC
> > timer.
> Do you get lock-ups wihtout the timer_ack/C1halt patch? If yes, this may
> be the cause. I remember someone finding out that Ross' patch made the
> timer actually slower which resulted in stable operation. Maciej found
> out, not connecting the timer at all made it stabke as well. So is there
> a possibility to sync both timers?
> According to a recent post, builöding kernel with SMP makes it stable,
> as well, but I haven't tested.
> > booted with "noapic" for XT-PIC timer, it stays locked
> > onto my wristwatch after an hour. If the workaround is disabled,
> > and XT-PIC timer is used, it matches the "noapic" behaviour -- no drift.
> > I can't explain it. I think it is a timer problem independent of the
> > IRQ routing.
> > -Len
> > ps. when i ran in XT-PIC mode there were lots of ERR's registered in
> > /proc/interrupts -- doesn't look healthy.
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