Re: Strange vmstat output. 2.6.10 Scheduler?
From: Catalin(ux aka Dino) BOIE
Date: Tue Feb 01 2005 - 05:56:18 EST
The vmstat you showed had bi and bo at the same time, so it's not so
surprising if bi often suffers if it is seeking all over the map to
write out the big chunk submitted.
I understand.
How does it look with write cache enabled?
Seems that almost the same:
0 1 12416 6068 6908 816292 0 0 1744 156 1276 1327 16 2 0 82
0 1 12416 6028 6908 816324 0 0 0 0 1270 1237 8 2 0 90
0 1 12416 5988 6908 816324 0 0 0 0 1255 454 2 2 0 96
0 2 12416 5956 6952 816324 0 0 0 80 1277 348 2 1 0 97
0 2 12416 5944 6952 816324 0 0 0 0 1257 322 2 2 0 96
0 2 12416 5960 6952 816324 0 0 0 0 1256 380 2 2 0 96
procs -----------memory---------- ---swap-- -----io---- --system--
----cpu----
r b swpd free buff cache si so bi bo in cs us sy id wa
1 2 12416 5960 6952 816324 0 0 0 0 1262 337 2 1 0 97
0 1 12416 4936 6952 817676 0 0 3400 180 1293 5466 31 6 0 63
0 1 12416 5276 6896 817180 0 0 5600 8288 1329 1622 15 4 0 81
0 1 12416 5212 6896 817228 0 0 0 0 1245 1237 7 2 0 91
0 1 12416 5148 6896 817252 0 0 0 0 1250 1313 7 3 0 90
0 1 12416 5152 6896 817284 0 0 0 0 1264 1243 7 2 0 91
0 2 12416 5152 6944 817284 0 0 0 104 1257 377 1 4 0 95
0 2 12416 5160 6944 817284 0 0 0 44 1250 407 2 1 0 97
0 2 12416 5160 6944 817284 0 0 0 0 1265 287 2 0 0 98
0 2 12416 5928 6940 816508 0 0 344 336 1272 384 2 3 0 95
0 1 12416 5608 6892 817088 0 0 4440 140 1246 5390 24 7 0 69
0 1 12416 5584 6848 817140 0 0 7436 612 1268 1707 16 3 0 81
0 1 12416 5960 6848 816480 0 0 5900 8156 1300 1428 9 5 0 86
0 1 12416 5632 6844 816824 0 0 1528 196 1271 1402 15 3 0 82
Not surprising, there's not much the io scheduler can do for you here.
--
Jens Axboe
---
Catalin(ux aka Dino) BOIE
catab at deuroconsult.ro
http://kernel.umbrella.ro/
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