On Wed, 2011-06-15 at 12:58 +0200, Peter Zijlstra wrote: > On Wed, 2011-06-15 at 12:36 +0200, Peter Zijlstra wrote: > > On Tue, 2011-06-14 at 17:29 -0700, Tim Chen wrote: > > > MOSBENCH test suite. > > > > Argh, I'm trying to get this thing to run, but its all snake poo.. > > > > /me takes up a heavy club and goes snake hunting, should make a pretty > > hat or something. > > Sweet, I've got meself a snake-skin hat! > > The first thing that stood out when running it was: > > 31694 root 20 0 26660 1460 1212 S 17.5 0.0 0:01.97 exim > 7 root -2 19 0 0 0 S 12.7 0.0 0:06.14 rcuc0 > 24 root -2 19 0 0 0 S 11.7 0.0 0:04.15 rcuc3 > 34 root -2 19 0 0 0 S 11.7 0.0 0:04.10 rcuc5 > 39 root -2 19 0 0 0 S 11.7 0.0 0:06.38 rcuc6 > 44 root -2 19 0 0 0 S 11.7 0.0 0:04.53 rcuc7 > 49 root -2 19 0 0 0 S 11.7 0.0 0:04.11 rcuc8 > 79 root -2 19 0 0 0 S 11.7 0.0 0:03.91 rcuc14 > 89 root -2 19 0 0 0 S 11.7 0.0 0:03.90 rcuc16 > 110 root -2 19 0 0 0 S 11.7 0.0 0:03.90 rcuc20 > 120 root -2 19 0 0 0 S 11.7 0.0 0:03.82 rcuc22 > 13 root -2 19 0 0 0 S 10.7 0.0 0:04.37 rcuc1 > 19 root -2 19 0 0 0 S 10.7 0.0 0:04.19 rcuc2 > 29 root -2 19 0 0 0 S 10.7 0.0 0:04.12 rcuc4 > 54 root -2 19 0 0 0 S 10.7 0.0 0:04.11 rcuc9 > 59 root -2 19 0 0 0 S 10.7 0.0 0:04.40 rcuc10 > 64 root -2 19 0 0 0 R 10.7 0.0 0:04.17 rcuc11 > 69 root -2 19 0 0 0 R 10.7 0.0 0:04.23 rcuc12 > 84 root -2 19 0 0 0 S 10.7 0.0 0:03.90 rcuc15 > 95 root -2 19 0 0 0 S 10.7 0.0 0:03.99 rcuc17 > 100 root -2 19 0 0 0 S 10.7 0.0 0:03.88 rcuc18 > 105 root -2 19 0 0 0 S 10.7 0.0 0:04.14 rcuc19 > 125 root -2 19 0 0 0 S 10.7 0.0 0:03.79 rcuc23 > 74 root -2 19 0 0 0 S 9.7 0.0 0:04.33 rcuc13 > 115 root -2 19 0 0 0 R 9.7 0.0 0:03.82 rcuc21 > > Which is an impressive amount of RCU usage.. FWIW, Alex Shi's patch: http://lkml.kernel.org/r/1308029185.15392.147.camel@sli10-conroe Improves the situation to: 3745 root 20 0 26664 1460 1212 S 18.5 0.0 0:01.28 exim 39 root -2 19 0 0 0 S 4.9 0.0 0:02.83 rcuc6 105 root -2 19 0 0 0 S 4.9 0.0 0:02.79 rcuc19 7 root -2 19 0 0 0 S 3.9 0.0 0:02.70 rcuc0 13 root -2 19 0 0 0 S 3.9 0.0 0:02.54 rcuc1 19 root -2 19 0 0 0 S 3.9 0.0 0:02.76 rcuc2 24 root -2 19 0 0 0 S 3.9 0.0 0:02.75 rcuc3 ... And throughput increases like: -tip 260.092 messages/sec/core -tip+sirq-rcu 271.078 messages/sec/core -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxxx For more info on Linux MM, see: http://www.linux-mm.org/ . Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/ Don't email: <a href