Re: [PATCH] O6int for interactivity

Mike Galbraith
2003-07-18T15:36:34Z

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At 12:31 PM 7/18/2003 +0200, Wiktor Wodecki wrote:
>On Fri, Jul 18, 2003 at 12:18:33PM +0200, Mike Galbraith wrote:
> > That _might_ (add salt) be priorities of kernel threads dropping too low.
> >
> > I'm also seeing occasional total stalls under heavy I/O in the order of
> > 10-12 seconds (even the disk stops). I have no idea if that's
> something in
> > mm or the scheduler changes though, as I've yet to do any isolation and/or
> > tinkering. All I know at this point is that I haven't seen it in stock
> yet.
>
>I've seen this too while doing a huge nfs transfer from a 2.6 machine to
>a 2.4 machine (sparc32). Thought it'd be something with the nfs changes
>which were recently, might be the scheduler, tho. Ah, and it is fully
>reproducable.

Telling to not mess with my kernel threads seems to have fixed it here...
no stalls during the whole contest run. New contest numbers attached.

-Mike

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no_load:
Kernel [runs] Time CPU% Loads LCPU% Ratio
2.5.69 1 153 94.8 0.0 0.0 1.00
2.5.70 1 153 94.1 0.0 0.0 1.00
2.6.0-test1 1 153 94.1 0.0 0.0 1.00
2.6.0-test1-mm1 1 152 94.7 0.0 0.0 1.00
2.6.0-test1-mm1X 1 153 94.8 0.0 0.0 1.00
cacherun:
Kernel [runs] Time CPU% Loads LCPU% Ratio
2.5.69 1 146 98.6 0.0 0.0 0.95
2.5.70 1 146 98.6 0.0 0.0 0.95
2.6.0-test1 1 146 98.6 0.0 0.0 0.95
2.6.0-test1-mm1 1 146 98.6 0.0 0.0 0.96
2.6.0-test1-mm1X 1 146 98.6 0.0 0.0 0.95
process_load:
Kernel [runs] Time CPU% Loads LCPU% Ratio
2.5.69 1 331 43.8 90.0 55.3 2.16
2.5.70 1 199 72.4 27.0 25.5 1.30
2.6.0-test1 1 264 54.5 61.0 44.3 1.73
2.6.0-test1-mm1 1 323 44.9 88.0 54.2 2.12
2.6.0-test1-mm1X 1 268 54.1 62.0 44.8 1.75
ctar_load:
Kernel [runs] Time CPU% Loads LCPU% Ratio
2.5.69 1 190 77.9 0.0 0.0 1.24
2.5.70 1 186 80.1 0.0 0.0 1.22
2.6.0-test1 1 213 70.4 0.0 0.0 1.39
2.6.0-test1-mm1 1 207 72.5 0.0 0.0 1.36
2.6.0-test1-mm1X 1 213 70.4 0.0 0.0 1.39
xtar_load:
Kernel [runs] Time CPU% Loads LCPU% Ratio
2.5.69 1 196 75.0 0.0 3.1 1.28
2.5.70 1 195 75.9 0.0 3.1 1.27
2.6.0-test1 1 193 76.7 1.0 4.1 1.26
2.6.0-test1-mm1 1 195 75.9 1.0 4.1 1.28
2.6.0-test1-mm1X 1 191 77.5 1.0 4.2 1.25
io_load:
Kernel [runs] Time CPU% Loads LCPU% Ratio
2.5.69 1 437 34.6 69.1 15.1 2.86
2.5.70 1 401 37.7 72.3 17.4 2.62
2.6.0-test1 1 243 61.3 48.1 17.3 1.59
2.6.0-test1-mm1 1 336 44.9 64.5 17.3 2.21
2.6.0-test1-mm1X 1 317 47.3 63.5 17.7 2.07
io_other:
Kernel [runs] Time CPU% Loads LCPU% Ratio
2.5.69 1 387 38.8 69.3 17.3 2.53
2.5.70 1 422 36.0 75.3 17.1 2.76
2.6.0-test1 1 258 57.8 55.8 19.0 1.69
2.6.0-test1-mm1 1 330 45.5 63.2 17.2 2.17
2.6.0-test1-mm1X 1 302 49.7 59.1 17.2 1.97
read_load:
Kernel [runs] Time CPU% Loads LCPU% Ratio
2.5.69 1 221 67.0 9.4 3.6 1.44
2.5.70 1 220 67.3 9.4 3.6 1.44
2.6.0-test1 1 200 74.0 9.7 4.0 1.31
2.6.0-test1-mm1 1 190 78.4 9.2 4.2 1.25
2.6.0-test1-mm1X 1 187 79.7 8.4 3.7 1.22
list_load:
Kernel [runs] Time CPU% Loads LCPU% Ratio
2.5.69 1 203 71.4 99.0 20.2 1.33
2.5.70 1 205 70.7 104.0 20.5 1.34
2.6.0-test1 1 199 72.4 102.0 21.6 1.30
2.6.0-test1-mm1 1 193 75.1 91.0 19.7 1.27
2.6.0-test1-mm1X 1 194 74.7 91.0 19.6 1.27
mem_load:
Kernel [runs] Time CPU% Loads LCPU% Ratio
2.5.69 1 256 57.8 34.0 1.2 1.67
2.5.70 1 252 58.7 33.0 1.2 1.65
2.6.0-test1 1 309 48.2 75.0 2.3 2.02
2.6.0-test1-mm1 1 277 53.8 38.0 1.4 1.82
2.6.0-test1-mm1X 1 225 65.8 38.0 1.8 1.47
dbench_load:
Kernel [runs] Time CPU% Loads LCPU% Ratio
2.5.69 1 517 28.8 5.0 35.6 3.38
2.5.70 1 424 35.1 3.0 26.7 2.77
2.6.0-test1 1 347 42.7 4.0 39.5 2.27
2.6.0-test1-mm1 1 377 39.8 4.0 36.9 2.48
2.6.0-test1-mm1X 1 510 29.4 5.0 34.3 3.33
ab_load:
Kernel [runs] Time CPU% Loads LCPU% Ratio
2.5.69 1 300 48.3 46.0 21.7 1.96
2.5.70 1 300 48.0 46.0 22.0 1.96
2.6.0-test1 1 281 51.6 50.0 25.6 1.84
2.6.0-test1-mm1 1 229 63.3 30.0 18.3 1.51
2.6.0-test1-mm1X 1 225 64.4 27.0 18.2 1.47
irman2_load:
Kernel [runs] Time CPU% Loads LCPU% Ratio
2.6.0-test1 1 999 14.5 31.0 0.0 6.53
2.6.0-test1-mm1 1 210 69.0 6.0 0.0 1.38
2.6.0-test1-mm1X 1 210 69.0 6.0 0.0 1.37