Messages in this thread | | | Subject | Re: Keyboard Stuttering | From | Lee Revell <> | Date | Thu, 12 Oct 2006 12:12:44 -0400 |
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On Tue, 2006-10-10 at 11:25 -0700, john stultz wrote: > On Tue, 2006-10-10 at 13:09 -0400, Dmitry Torokhov wrote: > > > Same problem here. Intel Core 2 Duo with 2.6.19-rc1 x86_64 SMP. Happens on > > > 2.6.17 too. I use 'noapic' as a workaround but that disables one of the CPU > > > core of course. > > > > > > I cannot reproduce the problem within the console nor gdm. Only on the X > > > desktop. > > > > > > > John, > > > > It looks like the only clocksource available on David's box is > > "jiffies" although the processor shows that it supporst tsc and PM > > timer is enabled and I think that this is what causes keyboard > > stuttering in X. See http://bugzilla.kernel.org/show_bug.cgi?id=7291. > > I believe clocksources is your turf, could you please take a look at > > this. > > Sure thing. I followed up in the bug, but I don't think the clocksource > code is involved. x86_64 hasn't converted to GENERIC_TIME, so jiffies is > what we use to increment xtime, but the TSC, ACPI PM, or HPET is used > for gettimeofday, etc. > > I suspect C3 idling is the culprit, since noapic works around the issue.
Wait, does this mean that Intel's x86-64 implementation has the same buggy TSC as AMD's?
Lee
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