Re: [PATCH] speed up SATA

From: Andrea Arcangeli
Date: Mon Mar 29 2004 - 08:12:08 EST

On Sun, Mar 28, 2004 at 08:29:12PM -0800, Wim Coekaerts wrote:
> > In 2.4 reaching 512k DMA units that helped a lot, but going past 512k
> > didn't help in my measurements. 1M maybe these days is needed (as Jens
> > suggested) but >1M still sounds overkill and I completely agree with
> > Jens about that.
> at least 1Mb... more than 1mb (I doubt 32mb is really necessarily
> useful) is nice for flushing contiguous journal data to disk. between
> 1-8mb in one io.
> at least 1mb is good when you have to process massive amounts of data,
> just read huge chunks of files, we tend to do 1mb. anyway,
> as you said, at some point it's a bit overkill . I thinkg 1-8mb makes
> sense.

1M certainly it's reasonable, though for 8M I've my doubt you can
measure a throughput improvement, can you?
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