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SubjectRe: System unresponsitive when copying HD/HD
Alan Cox wrote:
> But try 2.4.1 before worrying too much. That fixed a lot of the block
> performance problems I was seeing (2.4.1 ruins the VM performance under paging
> loads but the I/O speed is fixed ;))

---
Seems to have gotten a bit worse. Vmstat output after 'vmware' had completed
write -- but system unresponsive and writing out a 155M file...
1 0 0 0 113960 47528 277152 0 0 0 0 397 861 1 24 75
1 0 0 0 114060 47560 277152 0 0 4 350 432 1435 4 17 79
0 0 1 0 127380 47560 266196 0 0 0 516 216 435 7 3 90
1 0 1 0 127380 47560 266196 0 0 0 240 203 173 0 1 99
0 0 1 0 127380 47560 266196 0 0 0 434 275 180 0 2 98
1 0 1 0 127376 47560 266196 0 0 0 218 204 173 0 2 98
0 0 1 0 127376 47560 266196 0 0 0 288 203 174 0 0 100
0 0 1 0 127376 47560 266196 0 0 0 337 230 176 0 1 99
0 0 1 0 127376 47560 266196 0 0 0 267 241 177 0 1 99
0 0 1 0 127376 47560 266196 0 0 0 210 204 173 0 1 99
0 0 1 0 127376 47560 266196 0 0 0 204 203 173 0 1 99
0 0 1 0 127376 47560 266196 0 0 0 216 212 250 0 1 99
0 0 1 0 127376 47560 266196 0 0 0 208 205 172 0 2 98
0 0 1 0 127372 47560 266196 0 0 0 225 203 160 0 2 98
0 0 1 0 127372 47560 266196 0 0 0 316 214 212 0 1 99
1 0 1 0 127144 47560 266196 0 0 0 281 218 304 1 2 96
0 0 0 0 127144 47560 266196 0 0 0 1 161 240 1 0 99
0 0 0 0 127144 47560 266196 0 0 0 0 101 232 0 1 99
---
What is the meaning of having a process in the 'w' column? On other
systems, I was used to that meaning an executable had been *swapped* out completely
(as opposed to no pages mapped in) and that it meant your system vm was 'thrashing'.
But that obviously isn't the case here.
Those columns are output from a 'vmstat 5'. Meaning it took about 70 seconds
to write out 158M. Or about 2.2M/s. That's probably not bad. It still locks
up the system for over a minute though -- which is really undesirable performance
for interactive use. I'm guessing the vmstat output numbers are showing 4K? 8K?
blocks? 8K would about make sense for the 2.2M average.

--
Linda A Walsh | Trust Technology, Core Linux, SGI
law@sgi.com | Voice: (650) 933-5338
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