Messages in this thread | | | From | Con Kolivas <> | Subject | Re: 2.6.8-rc2-mm2 | Date | Thu, 05 Aug 2004 12:53:00 +1000 |
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Ingo Molnar writes:
> > * Con Kolivas <kernel@kolivas.org> wrote: > >> Ingo Molnar writes: >> >> Thanks for replying. >> >> >* Nick Piggin <nickpiggin@yahoo.com.au> wrote: >> > >> >>Also, basic interactivity in X is bad with the interactive sysctl set >> >>to 0 (is X supposed to be at nice 0?), however fairness is bad when >> >>interactive is 1. I'm not sure if this is an acceptable tradeoff - are >> >>you planning to fix it? >> > >> >it also has clear interactivity problems when just running lots of CPU >> >hogs even with the default interactive=1 compute=0 setting. >> >> Can you define them please? I haven't had any reported to me. > > sure: take a process that uses 85% of CPU time (and sleeps 15% of the > time) if running on an idle system. Start just two of these hogs at > normal priority. 2.6.8-rc2-mm2 becomes almost instantly unusable even > over a text console: a single 'top' refresh takes ages, 'ls' displays > one line per second or so. Start more of these and the system > effectively locks up.
It's only if I physically try and create such a test application that I can reproduce it. I haven't found any real world load that does that - but of course that doesn't mean I should discount it. However, interactive mode off doesn't exhibit it and it should be easy enough to fix for interactive mode on. Thanks for pointing it out.
Cheers, Con
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