Messages in this thread | | | Date | Fri, 18 Jul 2003 12:18:33 +0200 | From | Mike Galbraith <> | Subject | Re: [PATCH] O6int for interactivity |
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At 04:34 PM 7/18/2003 +1000, Nick Piggin wrote:
>Mike Galbraith wrote: > >>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 >>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 >>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 >>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 >>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 >>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 > >Looks like gcc is getting less priority after a read completes. >Keep an eye on this please.
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.
-Mike
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