On Sat, Mar 10, 2007 at 09:18:05AM +1100, Con Kolivas wrote: > On Saturday 10 March 2007 08:57, Con Kolivas wrote: > > On Saturday 10 March 2007 08:39, Matt Mackall wrote: > > > On Sat, Mar 10, 2007 at 08:19:18AM +1100, Con Kolivas wrote: > > > > On Saturday 10 March 2007 08:07, Con Kolivas wrote: > > > > > On Saturday 10 March 2007 07:46, Matt Mackall wrote: > > > > > > My suspicion is the problem lies in giving too much quanta to > > > > > > newly-started processes. > > > > > > > > > > Ah that's some nice detective work there. Mainline does some rather > > > > > complex accounting on sched_fork including (possibly) a whole timer > > > > > tick which rsdl does not do. make forks off continuously so what you > > > > > say may well be correct. I'll see if I can try to revert to the > > > > > mainline behaviour in sched_fork (which was obviously there for a > > > > > reason). > > > > > > > > Wow! Thanks Matt. You've found a real bug too. This seems to fix the > > > > qemu misbehaviour and bitmap errors so far too! Now can you please try > > > > this to see if it fixes your problem? > > > > > > Sorry, it's about the same. I now suspect an accounting glitch involving > > > pipe wake-ups. > > > > > > 5x memload: good > > > 5x execload: good > > > 5x forkload: good > > > 5 parallel makes: mostly good > > > make -j 5: bad > > > > > > So what's different between makes in parallel and make -j 5? Make's > > > job server uses pipe I/O to control how many jobs are running. > > > > Hmm it must be those deep pipes again then. I removed any quirks testing > > for those from mainline as I suspected it would be ok. Guess I"m wrong. > > I shouldn't blame this straight up though if NO_HZ makes it better. Something > else is going wrong... wtf though?
Just so we're clear, dynticks has only 'fixed' the single non-parallel make load so far. -- Mathematics is the supreme nostalgia of our time. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/