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    SubjectRe: [2.6.10-rc1 and prev] System unuseable while writing to disk
    Nick Piggin wrote:
    > Prakash K. Cheemplavam wrote:
    >
    >> 100 0
    >> 0 0 0 774876 14532 136460 0 0 0 0 1180 436 1
    >> 0 99 0
    >> 1 1 0 571740 14732 333736 0 0 32 42628 1325 633 3
    >> 43 52 2
    >> 2 2 0 217812 15072 676648 0 0 0 45184 1523 1771 14
    >> 78 0 8
    >> 1 2 0 220436 15072 676648 0 0 0 49664 1582 1365 9
    >> 6 0 85
    >> 0 2 0 85460 15984 808012 0 0 164 73984 1487 1143 18
    >> 32 0 49
    >> 0 1 0 85716 15984 808140 0 0 0 29056 1493 1381 4
    >> 6 0 90
    >> 0 1 0 86100 15984 808140 0 0 0 40320 1420 1367 3
    >> 2 0 95
    >> 0 1 0 86100 15984 808140 0 0 0 44416 1386 693 0
    >> 2 0 98
    >> 0 1 0 86100 15984 808140 0 0 0 50304 1518 1413 5
    >> 6 0 89
    >> 0 1 0 86164 15984 808140 0 0 0 28544 1452 827 1
    >> 2 0 97
    >> 0 1 0 86292 15984 808140 0 0 0 35840 1386 809 1
    >> 2 0 97
    >> 0 1 0 86356 15984 808140 0 0 0 37376 1450 1373 3
    >> 3 0 94
    >> procs -----------memory---------- ---swap-- -----io---- --system--
    >> ----cpu----
    >> r b swpd free buff cache si so bi bo in cs us
    >> sy id wa
    >> 1 1 0 86484 15984 808140 0 0 0 42880 1752 2494 7
    >> 6 0 87
    >> 0 1 0 86484 15984 808140 0 0 0 31872 1608 2098 7
    >> 4 0 89
    >> 0 1 0 86484 15984 808140 0 0 0 45952 1530 795 1
    >> 2 0 97
    >> 0 1 0 86484 15984 808140 0 0 0 44288 1515 814 0
    >> 3 0 97
    >> 0 1 0 90580 15984 808140 0 0 0 29052 1471 1365 5
    >> 5 0 90
    >> 1 0 0 90148 16108 809356 0 0 976 2088 1383 1319 22
    >> 11 0 67
    >> 0 0 0 90148 16108 809360 0 0 4 16 1444 833 10
    >> 5 84 1
    >> 0 0 0 90148 16108 809360 0 0 0 0 1256 473 0
    >> 0 100 0
    >> 0 0 0 90148 16108 809360 0 0 0 0 1379 611 3
    >> 1 96 0
    >> 0 0 0 90148 16108 809360 0 0 0 0 1526 2439 16
    >> 5 79 0
    >> 0 0 0 90148 16164 809360 0 0 0 120 1563 1824 16
    >> 4 80 0
    >>
    >>
    >> Beginning and end the system is idle and then I start writing down the
    >> file. During that time thunderbird gets unusable.
    >>
    >
    > It looks like it may be a CPU scheduler issue: Nothing needs to
    > be read, no swap activity, enough free memory.

    I see this behaviour with default scheduler in vanilla and with staircase...


    > However, it also does look like there is a lot of CPU power free,
    > which makes the cpu scheduler less likely... Maybe interrupts are
    > using a lot of CPU time or latency, and that is being hidden from
    > CPU time accounting.
    >
    > I think Ingo did notice quite large latencies in disk interrupts,
    > although whether that would be enough to make thunderbird "unusable",
    > I'm not sure.

    I tried preempt (inkl preempt "big kernel lock" in ck) which doesn't
    avoid above. (I don't rember whether it was better, though.)

    bye,

    Prakash
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