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SubjectRe: [patch] delayed disk block allocation
From
It's not on a big box, but I have a side by side of
2.5.6-pre2 and 2.5.6-pre2 with patches from
http://www.zipworld.com.au/~akpm/linux/patches/2.5/2.5.6-pre2/

2.5.6-pre2-akpm compiled with MPIO_DEBUG = 0 and ext2
filesystem mounted with delalloc.

tiobench and dbench were on ext2.
bonnie++ and most other tests were on reiserfs.

2.5.6-pre2-akpm throughput on ext2 is much improved.

http://home.earthlink.net/~rwhron/kernel/akpm.html

One odd number in lmbench is page fault latency. Lmbench also
showed high page fault latency in 2.4.18-pre9 with make_request,
read-latency2, and low-latency. 2.4.19-pre1aa1 with read_latency2
(2.4.19pre1aa1rl) did not show a bump in page fault latency.

--
Randy Hron

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