As mentioned before, IO could give such strange results. I suggest
launching
dstat with logging to a file, and analyzing the file afterwards.
Thanks, much appreciated!
This has yielded some interesting data, which I'll attempt to include
a few seconds before and after one of these events occurred.
system interrupts per second: Note the ~200x jump to almost 200,000
interrupts per second.
2907
6714
1371
194218
2456
2907
network received: Note the network received ramps up over 5 seconds,
peaks at ~50x background, and ramps back down in about 3 seconds. The
peak is from the same sample as the 200x sample above.
108784
389794
1070850
4843956
352226
353102
96392
Everything else looks sane -- there's enough ram, nothing's being
swapped out, etc. This is on a private-network server that has a load
balancer in front of it, so if it's network related, it wouldn't be
misdirected random bits.
Has anyone seen this sort of behavior before? What was the cause? What
should I do to figure out how to keep the load averages from flipping
out of control?
(This isn't something as lame as a counter rolling over somewhere
internal to the kernel, is it? Wouldn't think so, but thought to ask.
Running 2.6.18-8.1.8.el5. We could reboot to run 2.6.18-8.1.15 if
that'd be a potential fix.)
Thanks for any insight!
best,
Jeff
total cpu usage dsk/total net/total system
usr sys read writ recv send int csw
10.5 3.25 0 409600 108784 72286 2907 20376
3.99 2.993 0 319488 389794 661170 6714 23941
0.25 0.25 0 720896 1070850 1189720 1371 16648
9.167 90.442 12288 1122304 4843956 399998 194218 55433
56.931 16.832 0 1273856 352226 334506 2456 12844
46.25 20 0 454656 353102 384496 2907 20631
24.25 1.25 0 3260416 96392 72316 1342 17307
23.25 2.25 0 610304 91086 71194 1458 17584
10.973 1.496 0 0 84192 46276 1349 18135
0 0 0 94208 71892 33304 1220 16979
0.25 0.25 0 126976 71184 47576 1268 16973
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