Messages in this thread | | | Date | Fri, 10 Sep 2010 15:22:57 +0200 | From | Artur Skawina <> | Subject | Re: [BISECTED] 2.6.35.*: horrible (exponential? >linear) slowdown to unusability (HPET) |
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On 09/10/10 11:41, Jiri Slaby wrote: > AFAIU, clocksource=jiffies shouldn't fix this issue. If that's the case > we have another 2.6.32->2.6.33 regression (and I will report it > separately). People report the system is unusable (sleepers are not > woken), unless clocksource=jiffies, clocksource=tsc or nolapic_timer is > used or a key pressed (i.e. some HW interrupt): > https://bugzilla.novell.com/show_bug.cgi?id=579932 > (there is also a report with 2.6.35.3 vanilla)
I saw this first in v2.6.35-rc4. The symptom is that suddenly everything stops and the only way to make things progress is to generate some events. Apps that are waiting for a timeout aren't woken up unless you press a key etc. After a few minutes (and lots of key presses ;) ) the machine usually recovers, leaving no trace in logs. It's a nasty bug to debug as there's no way to trigger it, at least here, and it usually does not want to happen when you most want it to; took me ~week to strike a bios upgrade from the suspect list, another one to exclude intel_idle and so on. Never got around to check 30a564be9d955, which was on the list too, unfortunately. I'll bet it /is/ the cause, but won't be able to confirm this for quite a while...
artur
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