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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.
>>

So I did some further tests with my new hd. I put my home dir onto it
using different file systems and this was the result:

- reiserfs: craps out, as explained
- ext2: much better but tb gets unusable for short periods of time, as well
- xfs: I couldn't get tb unuseable here. It gets much slower, but still
usable

So it seems at partially (if not entirely?) be related to the
filesystem. Could it be other parts of the kernel which are not doing
its job properly ans just exhibiting some fs's weakness?

Prakash
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