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SubjectRe: 2.5.57 IO slowdown with CONFIG_PREEMPT enabled
On Wed, 15 Jan 2003, Andrew Morton wrote:
> OK, thanks.  The below patch reverts the spinlocking change,
> if you could please test that with CONFIG_PREEMPT=y

Reverting that brings the speed back up
2.5.57, preempt on, 8gig RAM
r b swpd free buff cache si so bi bo in cs us sy
id wa
5 1 3624 7832 177824 7413824 0 1 16 8195 156 153 0 48
46 5
8 0 3624 7124 179336 7413612 0 0 0 110510 1317 2014 0 83
10 7
9 1 3624 8112 182552 7409316 0 1 0 109681 1309 1369 0 90
4 6
8 1 3624 8176 185824 7405948 0 0 0 112612 1302 2202 0 75
17 8
10 1 3632 7328 189300 7402564 0 1 0 112160 1352 1764 0 81
12 6

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