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    SubjectRe: USB making time drift [was Re: dynamic-hz]
    Hi!

    > >> Which way? I was running quite fast here, several minutes an
    > >
    > >In the future, if I disable the logic it goes in the past at the
    > > same speed it was previously going in the future.
    > >
    > >> hour, then I discovered the tickadj command, found its default
    > >> was 10000, and started reducing it. At 9926, I'm staying within
    > >> a sec an hour now. I have no idea when this started, I didn't
    > >
    > >That seems quite an hack, note I did an hack too and it make the
    > > drift much smaller (it gets manageable). But our modifications are
    > > wrong.
    > >
    > >The point is that this didn't happen with HZ=100, so it's not that
    > >tickadj is wrong, it's the tick adjustment code that doesn't work.
    > >
    > The HZ=1000 is the culprit?
    >
    > >You may want to recompile your kernel with HZ=100 and verify it goes
    > >away (I didn't verify myself, but I verified the max irq latency I
    > > get is 4msec, and in turn I'm sure HZ=100 would fix it
    >
    > Humm, that might also reduce the obviousness of the irq activity in
    > the audio, there are times when I can hear it very plainly while a
    > low level audio src is in use, like the sub-millivolt levels that come
    > out of my Hauppauge WinTV-GO+FM card. I keep having to turn the

    Try idle=poll. That noise may be commig from cpu switching between
    powersave and full speed.
    Pavel
    --
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