Messages in this thread | | | Date | Thu, 7 Apr 2005 23:25:38 -0700 | From | Tony Lindgren <> | Subject | Re: [PATCH] Dynamic Tick version 050406-1 |
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* Frank Sorenson <frank@tuxrocks.com> [050407 15:21]: > Frank Sorenson wrote: > > Tony Lindgren wrote: > > > >>Thanks for trying it out. What kind of hardware do you have? Does it > >>have HPET? It looks like no suitable timer for dyn-tick is found... > >>Maybe the following patch helps? > >> > >>Tony > > > > > > Does 'different crash' qualify as "helping"? :) > > Update: > The patch does seem to fix the crash. This "different crash" I > mentioned appears to be related to the netconsole I was using (serial > console produces stairstepping text, netconsole seems to duplicate > lines--go figure). Without netconsole, dynamic tick appears to be > working, so I'm not sure whether this is a netconsole bug or a dynamic > tick bug.
This might be because time does not run correctly, see below.
> While dynamic tick no longer panics, with dynamic tick, my system slows > to whatever is slower than a crawl. It now takes 6 minutes 50 seconds > to boot all the way up, compared to 1 minute 35 seconds with my 2.6.12 > kernel without the dynamic tick patch. I'm not sure where this slowdown > is occurring yet.
I think I have an idea on what's going on; Your system does not wake to APIC interrupt, and the system timer updates time only on other interrupts. I'm experiencing the same on a loaner ThinkPad T30.
I'll try to do another patch today. Meanwhile it now should work without lapic in cmdline.
Tony
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