Alan Cox wrote:
On Llu, 2005-06-13 at 15:06, Nick Piggin wrote:
Make sure you have pre-empt disabled and the antcipatory I/O scheduler
disabled.
I don't think that those could explain it.
Try it and see. The anticipatory I/O scheduler does horrible things to
my IDE streaming performance numbers and to swap performance. It tries
to merge I/O by delaying it which is deeply ungood when it comes to IDE
streaming even if its good for general I/O.
Now I've tested it with preempt disabled and nothing has changed. When
fiddling around with hdparm, I got about 16MB/s max. with 2.6.12-rc5.
With 2.4.31, I got about 21MB/s when just the DMA was enabled
(read-ahead and multcount set to 0 - changing them does not make almost
any difference).
--
Ondrej Zary
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