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SubjectRe: [PATCH] 2.4 read ahead never reads the last page in a file
Hi Chuck,

I've run 2.4.23 both vanilla and patched, and I confirm a win on NFS reads.
I tested from 1 to 6 parallel reads consisting of md5sum of kernel includes :
time find include -type f | xargs md5sum >/dev/null &
Results below :

processes 2.4.23 2.4.23-patched
1 11.5 11.45
2 12.82 12.68
3 14.7 14.4
4 17.8 17.3
5 21.5 21.0
6 25.7 25.0 => server is saturated 100% sys
7 29.3 29.0 => server is saturated 100% sys

Fileset contain 7346 files totalizing 29952 kB.
So there's a gain of nearly 3% in the best case (6 processes). Not bad.
I suspect that I could also gain slightly more by patching the server too.

Cheers,
Willy

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