Re: [PATCH] Dynamic tick, version 050127-1

[Pavel Machek <pavel@ucw.cz>]

Hi!

> > > > It could also be that the reprogamming of PIT timer does not work on
> > > > your machine. I chopped off the udelays there... Can you try
> > > > something like this:
> > > 
> > > I added the udelays, but behaviour did not change.
> > 
> > Yeah, and if the first patch was working better, that means the PIT
> > interrupts work. I'll do another version of the patch where PIT
> > interrupts work again without local APIC needed, let's see what
> > happens with that.
> 
> I think something broke TSC timer after the first patch, but I could
> not figure out yet what. So the bad combo might be local APIC + TSC.
> At least I'm seeing similar problems with local APIC + TSC timer.
> 
> Attached is a slightly improved patch, but the patch does not fix
> the TSC problem. It just fixes compile without local APIC, and
> booting SMP kernel on uniprocessor machine.
> 
> Currently the suggested combo is local APIC + ACPI PM timer...

Ok, works slightly better: time no longer runs 2x too fast. When TSC
is used, I get same behaviour  as before ("sleepy machine"). With
"notsc", machine seems to work okay, but I still get 1000 timer
interrupts a second.

> And if that works, changing the I8042_POLL_PERIOD from HZ/20 in
> drivers/input/serio/i8042.h to something like HZ increases the
> sleep interval quite a bit. I think I had lots of polling also in
> CONFIG_NETFILTER, but I haven't verified that.

Okay, I set POLL_PERIOD to 5*HZ, and disabled USB. Perhaps it will
sleep better now?
								Pavel
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