From: ed.rolison@itc.alstom.com
Date: Wed May 04 2005 - 07:11:47 EDT
Hello Sunmanagers. I'm trying to troubleshoot an odd problem.
Quite simply, on a solaris 8 420R, we've been noticing a high 'kernel'
system usage.
Consistently over 50%, on this 2cpu machine. Looking closer with mpstat,
_something_ seems to be occupying
cpu 2 all of the time, with 'system' usage.
eg.
CPU minf mjf xcal intr ithr csw icsw migr smtx srw syscl usr sys wt
idl
1 0 0 75 464 322 511 156 1 22 0 63462 26 74 0
0
2 0 0 49 28350 1016 1262 437 1 412 0 0 0 100 0
0
CPU minf mjf xcal intr ithr csw icsw migr smtx srw syscl usr sys wt
idl
1 34 0 142 507 388 503 150 1 13 0 58425 37 63 0
0
2 0 0 23 28517 1061 847 292 1 277 0 0 0 100 0
0
CPU minf mjf xcal intr ithr csw icsw migr smtx srw syscl usr sys wt
idl
1 0 0 93 421 307 445 123 0 16 0 65695 26 74 0
0
2 0 0 16 30098 1213 510 175 0 167 0 0 0 100 0
0
It's consistent, and sustained. The machine has been rebooted, and as far
as I can tell 'obvious' culprits, such as NFS don't run on this machine.
Using sar to check paging, and iostat to look at disk IO, suggests that
there's basically nothing going on there, either.
bash-2.03# vmstat 5 5
procs memory page disk faults cpu
r b w swap free re mf pi po fr de sr m0 m1 m3 m7 in sy cs us sy
id
12 0 0 3418048 1451992 32 99 37 5 5 0 0 3 0 0 11 18332 22751 2128 10
65 25
0 0 0 3330888 1371776 0 1 0 0 0 0 0 0 0 0 0 22581 475 3622 1 53
46
0 0 0 3330888 1371776 0 0 0 0 0 0 0 0 0 0 0 16506 426 2418 0 53
47
3 0 0 3330888 1371776 0 0 0 0 0 0 0 0 0 0 0 19451 392 2523 1 55
44
0 0 0 3330888 1371776 0 0 0 0 0 0 0 0 0 0 7 23413 458 3724 1 55
44
(although there would appear to be a lot of interrupts for some reason)
Any suggestions as to how to find the source of all this kernel activity
would be greatly appreciated.
Thanks,
Ed Rolison
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