On Sunday 04 March 2007, Willy Tarreau wrote: >On Mon, Mar 05, 2007 at 08:49:29AM +1100, Con Kolivas wrote: >(...) > >> > That's just what it did, but when you "nice make -j4", things >> > (gears) start to stutter. Is that due to the staircase? >> >> gears isn't an interactive task. Apart from using it as a background >> load to check for starvation because it loads up the cpu fully (which >> a gpu intensive but otherwise simple app like this should _not_ do) >> graphics card drivers and interrupts and so on, I wouldn't put much >> credence on gears as anything else. However I suspect that gears will >> still get a fair share of the cpu on RSDL which almost never happens >> on any other scheduler. > >Con, > >I've now given it a try with HZ=250 on my dual-athlon. It works > beautifully. I also quickly checked that playing mp3 doesn't skip > during make -j4, and that gears runs fairly smoothly, since those are > the references people often use. > >But with real work, it's excellent too. When I saturate my CPUs by > injecting HTTP traffic on haproxy, the load is stable and the command > line perfectly responsive, while in the past the load would oscillate > and the command line sometimes stopped to respond for a few seconds. > >I've also launched my scheddos program (you may remember, the one we did > a few experiments with). I could not cause any freeze at all. Plain > 2.6.20 had already improved a lot in this area, but above 4 > processes/CPU, occasional short freezes did still occur. This time, > even at 100 processes, the system was rather slow (of course!) but just > as expected, and nothing more. > >I also tried the good old "dd if=/dev/zero bs=1|...|dd bs=1 > of=/dev/null" and it did not cause any trouble. > >I will boot 2.6 slightly more often to test the code under various > conditions, and I will recommend it to a few people I know who tend to > switch back to 2.4 after one day full of 2.6 jerkiness. > >Overall, you have done a great job ! > >I hope that more people will give it a try, first to help find possible >remaining bugs, and to pronounce in favour of its inclusion in mainline. > >Cheers, >Willy > +1 for mainline, this is a HUGE improvement in usability. End of discussion AFAIK. >- >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/
-- Cheers, Gene "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) - 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/