Messages in this thread | | | Date | Thu, 25 May 2006 14:56:57 +0400 | From | Vasily Tarasov <> | Subject | ioprio feature behaviour |
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Hello. I produced a little test of ioprio feature. Results are basically good enough, but there is something strange on my mind. The test just runs 8 simple readers with priorities 0, 1, .., 7 in best effort class. Readers read from files and count how much Mbytes per second they can read. Results are here: Process # (prio) Measurement 1 (Mbps) Measurement 2 (Mbps) Measurement 3 (Mbps) 0 6,60 7,37 6,19 1 7,87 7,90 7,15 2 5,92 4,75 4,61 3 3,31 3,34 3,4 4 0,95 0,97 1,03 5 1,14 1,23 1,2 6 0,83 0,96 0,83 7 0,41 0,41 0,41 ( The whole results are at http://www.7ka.mipt.ru/~vass/cfq-tests/tests.pdf)
The questions are: 1) Why process 0 with priority 0 has less bandwidth than process 1 with priority 1? 2) The same with processes (priorities) 4, 5? 3) Why there is no _uniform_ dependence between bandwidth and priority? 4) Why sums of bandwidths of processes when priorities are setted and when they are not setted (look in pdf) aren't equal?
Thanks, Vasily. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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