Messages in this thread | | | Date | Tue, 3 Oct 2006 10:47:29 +0200 | From | Ingo Molnar <> | Subject | Re: [patch 00/21] high resolution timers / dynamic ticks - V2 |
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* Andrew Morton <akpm@osdl.org> wrote:
> These patches make my Vaio run really really slowly. Maybe a quarter > of the normal speed or lower. Bisection shows that the bug is > introduced by > clockevents-drivers-for-i386.patch+clockevents-drivers-for-i386-fix.patch > > With all patches applied, the slowdown happens with > CONFIG_HIGH_RES_TIMERS=n and also with CONFIG_HIGH_RES_TIMERS=y && > CONFIG_NO_HZ=y. So something got collaterally damaged.
yeah, i suspect it works again if you disable:
CONFIG_X86_UP_APIC=y CONFIG_X86_UP_IOAPIC=y CONFIG_X86_LOCAL_APIC=y CONFIG_X86_IO_APIC=y
as the slowdown has the feeling of a runaway lapic timer irq.
from code review so far we can only see an udelay(10) difference in the initialization sequence of the PIT - we'll send a fix for that but i dont think that's the cause of the bug.
investigating it.
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