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    SubjectRe: Interrupt latency on some 945GM platforms
    Date
    В сообщении от 14 of September 2010 03:55:32 автор Venkatesh Pallipadi 
    написал:

    > Whats the clockevent in this case ("Tick Device" section of
    > /proc/timer_list). clocksource= option only changes the clocksource used
    > to maintain
    > timeofday. But, timer interrupt (clockevent) source will not change.
    > Wondering how just the clocksource change is making the diff here..
    >
    > Also, if clocksource tsc has a higher rating than HPET. The reason
    > HPET is getting used as clocksource in the first place seems to be due
    > to TSC is not a dependable clocksource on this platform (may be it
    > stops in C3). So, I am not sure forcing it to tsc will be a good
    > thing. May be clocksource=acpi_pm is a better thing to try.
    >
    > Thanks,
    > Venki

    I investigated it a bit and found out that single nohz=off option helps. Just
    changing clocksource doesn't help, but it works smoothly with any clocksource
    with nohz=off. So, it seems that something wrong with intel driver while
    system is in tickless mode.

    Regards
    Vasily
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