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Open Source and information security mailing list archives
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Date: Mon, 26 Nov 2007 11:54:18 +0000 From: Pavel Machek <pavel@....cz> To: Thomas Gleixner <tglx@...utronix.de> Cc: Ingo Molnar <mingo@...e.hu>, kernel list <linux-kernel@...r.kernel.org> Subject: Re: nohz and strange sleep latencies Hi! > > > but perhaps somehow we miss this fact and fail to turn off the lapic > > > clockevents drivers? > > > > Ok, I guess I'm lost. If I offline second CPU, I immediately get > > 1000Hz timer tick... is that expected? > > Hmm. No. I have no idea why this is happening. > > 34196 total events, 55.083 events/sec > echo 0 >/sys/devices/system/cpu/cpu1/online > 36073 total events, 54.679 events/sec It happened again, this time on 2.6.24-pre-rc1 (mostly untainted). Reboot and problem goes away... so this one is random :-(. I'll try plug/unplug loops, perhaps that can trigger it reliably. (cpu replug does not fix it once triggered). Pavel -- (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.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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