Re: NForce2, Ross Dickson's timer patch on 2.6.1

[Matt H.]

Ditto here, using nforce2. I've been up for about a week and a half and my 
clock is skew'ed by at least 20 mins . 

Matt H.

On Monday 12 January 2004 10:35 am, Jesse Allen wrote:
> Hi Ross,
>
> I have a version of your timer patch (io_apic.c) for kernel 2.6.1.  It is
> attached.  I have been monitoring a problem with it.  It seems that with
> the patch, I gain 1 seconds time over 10 minutes (roughly).  So I gain
> about 2-3 mintues a day.  I haven't taken exact measurements, but I know it
> ends up about 20 minutes difference after a week.  This is not good, which
> would require resetting the time often.
>
> I tried the 2.6.1 kernel without the timer patch.  The timer is now back in
> PIC mode, and interrupt 7 has the old noise.  Synched the time with my
> watch.  At first, I noticed no gain in time over 10 minutes.  However the
> next day, I found it gained 1-2 seconds.  Now it is about 7 seconds ahead a
> few days later now. This is much better.
>
> So I'm left to thinking, the patch does two things, maybe one thing right,
> and one possibly very wrong:
>
> 1) It does place the timer in APIC mode.
> 2) But the timer seems to be fed extra interrupts, maybe the same that is
> found on irq 7 without the patch (is this possible?)
>
> I remember someone making a comment which might explain the issue:
> http://marc.theaimsgroup.com/?l=linux-kernel&m=107098440019588&w=2
>
> I don't think the patch was much different now than it was then.  So I
> think there is something wrong with setting up the timer this way.  I don't
> know if you worked something out with Maciej.  I don't know much about
> interrupt controller programming so...  if maybe you can explain to me
> anything I'm missing.  For now I've dropped the patch.
>
>
> Jesse
>
>
> PS:  I have run with disconnect on, and without your ack patch since I got
> that surpise BIOS update.  No lockups have occurred in the past month,
> since that.  So the disconnect problem is a BIOS bug.  (Shuttle has not
> responded)
>
> PSS:  CC me, I'm not subscribed right now.
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