Messages in this thread | | | Date | Wed, 15 Dec 2004 21:16:18 +0100 | From | Pavel Machek <> | Subject | Re: USB making time drift [was Re: dynamic-hz] |
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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 -- People were complaining that M$ turns users into beta-testers... ...jr ghea gurz vagb qrirybcref, naq gurl frrz gb yvxr vg gung jnl! - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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