Actually, I spoke too soon. We developed a quick stress test that
causes the problem immediately:
11:18am up 3 days, 1:36, 3 users, load average: 8.72, 7.18, 3.96
91 processes: 85 sleeping, 6 running, 0 zombie, 0 stopped
CPU states: 0.1% user, 93.4% system, 0.0% nice, 6.4% idle
Mem: 3343688K av, 3340784K used, 2904K free, 0K shrd, 308K buff
Swap: 1004052K av, 567404K used, 436648K free 2994288K cached
PID USER PRI NI SIZE RSS SHARE STAT LIB %CPU %MEM TIME COMMAND
12102 oracle 13 0 16320 15M 14868 R 5584 67.2 0.4 18:58 oracle
12365 oracle 18 5 39352 38M 37796 R N 30M 66.7 1.1 4:14 oracle
12353 oracle 18 5 39956 38M 38408 R N 31M 66.5 1.1 9:14 oracle
12191 root 13 0 892 852 672 R 0 66.4 0.0 6:09 top
12366 oracle 9 0 892 892 672 S 0 60.0 0.0 3:20 top
9 root 9 0 0 0 0 SW 0 49.0 0.0 9:27 kswapd
11 root 9 0 0 0 0 SW 0 38.3 0.0 3:58 kupdated
105 root 9 0 0 0 0 SW 0 28.8 0.0 4:56 kjournald
470 root 9 0 844 828 472 S 0 28.1 0.0 1:46 gamdrvd
12351 oracle 13 5 39956 38M 38408 S N 31M 25.6 1.1 3:08 oracle
669 oracle 9 0 4780 4780 4384 S 492 24.4 0.1 1:42 oracle
1 root 14 0 476 424 408 R 0 21.6 0.0 1:19 init
2 root 14 0 0 0 0 RW 0 20.8 0.0 1:29 keventd
615 oracle 9 0 8984 8984 8460 S 4380 16.3 0.2 2:41 oracle
388 root 9 0 732 728 592 S 0 11.5 0.0 0:17 syslogd
kswapd bounces up and down from 99%.
Keys for me are the full system time, the fact that the %CPUs seem to
add up to more than 6xCPUs (6-way Xeon), and that processes that aren't
really active show up as "active".
ASAP, I'll try -pre6 and then -aa1 to compare behavior.
The Oracle stress query looks like:
select /*+ parallel(mt,5) cache(mt) */ count(*) from mtable_units ;
Thanks much,
-- Ken.On Mon, Nov 19, 2001 at 12:31:25PM -0600, Ken Brownfield wrote: | Linus, so far 2.4.15-pre4 with your patch does not reproduce the kswapd | issue with Oracle, but I do need to perform more deterministic tests | before I can fully sign off on that. | | BTW, didn't your patch go into -pre5? Or is there an additional mod in | -pre6 that we should try? | -- | Ken. | brownfld@irridia.com | | On Mon, Nov 19, 2001 at 10:07:58AM -0800, Linus Torvalds wrote: | | | | On Mon, 19 Nov 2001, Sebastian Dröge wrote: | | > Hi, | | > I couldn't answer ealier because I had some problems with my ISP | | > the heavy swapping problem while burning a cd is solved in pre6aa1 | | > but if you want i can do some statistics tommorow | | | | Well, pre6aa1 performs really badly exactly because it by default doesn't | | swap enough even on _normal_ loads because Andrea is playing with some | | tuning (and see the bad results of that tuning in the VM testing by | | rwhron@earthlink.net). | | | | So the pre6aa1 numbers are kind of suspect - lack of swapping may not be | | due to fixing the problem, but due to bad tuning. | | | | Does plain pre6 solve it? Plain pre6 has a fix where a locked shared | | memory area would previously cause unnecessary swapping, and maybe the CD | | burning buffer is using shmlock.. | | | | Linus | | | | - | | To unsubscribe from this list: send the line "unsubscribe linux-kernel" in | | the body of a message to majordomo@vger.kernel.org | | More majordomo info at http://vger.kernel.org/majordomo-info.html | | Please read the FAQ at http://www.tux.org/lkml/ | - | To unsubscribe from this list: send the line "unsubscribe linux-kernel" in | the body of a message to majordomo@vger.kernel.org | More majordomo info at http://vger.kernel.org/majordomo-info.html | Please read the FAQ at http://www.tux.org/lkml/ - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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