Kurt Garloff, on 07/16/2009 12:52 AM wrote:
Hi,
On Wed, Jul 08, 2009 at 04:40:08PM +0400, Vladislav Bolkhovitin wrote:
I've also long ago noticed that reading data from block devices is slower
than from files from mounted on those block devices file systems. Can
anybody explain it?
Brainstorming:
- block size (reads on the block dev might be done with smaller size)
As we already found out in this and other threads, smaller "block size",
i.e. each request size, is often means better throughput, sometimes much
better.
- readahead (do we use the same RA algo for block devs)
- page cache might be better optimized than buffer cache?
Just guesses from someone that has not looked into that area of the
kernel for a while, so take it with a grain of salt.
Cheers,
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