Bruce Evans wrote:
None was attached.
(meaning the c prog yes?) I notice that it is stripped out from the web
archive... so here's a link:
http://homepages.paradise.net.nz/markir/download/freebsd/readtest.c
Machines
========
- ufs2 32k blocksize, 4K fragments
^^^^^^^^^^^^^^^^^^
Try using an unpessimized block size. Block sizes larger than BKVASIZE
(default 16K) fragment the buffer cache virtual memory.
Right - I should have said, I saw a comment to that effect in
src/sys/sys/param.h, and so I tested with 8K, 16K too, interestingly on
my system 32K seemed to be faster, even for the bigger files (of course
- hard to know if it was really significant...).
However, I
couldn't see much difference between block sizes of 16, 32 and 64K for
a small (32MB) md-malloced file system with a simple test program.
All versions got nearly 1/4 of bandwidth of main memory (800MB/S +-10%
an an AthlonXP with ~PC3200 memory).
Cheers
Mark
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