On Fri, 2006-03-17 at 18:15 +0100, Mike Galbraith wrote: > Problem solved. I now know why the starvation logic doesn't work. > Wakeups. In the face of 10+ copies of httpd constantly waking up, it > seems it just takes ages to get around to switching arrays. > > With the (urp) patch below, I now get... > > [root]:# time netstat|grep :81|wc -l > 1648 > > real 0m27.735s > user 0m0.158s > sys 0m0.111s > [root]:# time netstat|grep :81|wc -l > 1817 > > real 0m13.550s > user 0m0.121s > sys 0m0.186s > [root]:# time netstat|grep :81|wc -l > 1641 > > real 0m17.022s > user 0m0.132s > sys 0m0.143s > [root]:# For those interested in these kind of things, here are the numbers for 2.6.16-rc6-mm2 with my [tarball] throttle patches applied... [root]:# time netstat|grep :81|wc -l 1681 real 0m1.525s user 0m0.141s sys 0m0.136s [root]:# time netstat|grep :81|wc -l 1491 real 0m0.356s user 0m0.130s sys 0m0.114s [root]:# time netstat|grep :81|wc -l 1527 real 0m0.343s user 0m0.129s sys 0m0.114s [root]:# time netstat|grep :81|wc -l 1568 real 0m0.512s user 0m0.112s sys 0m0.138s ...while running with the same apache loadavg of over 10, and tunables set to server mode (0,0). <plug> Even a desktop running with these settings is so interactive that I could play a game of Maelstrom (asteroids like thing) while doing a make -j30 in slow nfs mount and barely feel it. In a local filesystem, I could't feel it at all, so I added a thud 3, irman2 and a bonnie -s 2047 for good measure. Try that with stock :) </plug>
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