Performance Difference based on .... ?

[Thanos Chatziathanassiou <tchatzi@arx.gr>]

Hello list,

I have come to a dead-end...
How come on a freshly mounted file-system, compiling takes considerably 
less time than on subsequent runs ?
I mean, this snip of shell:
---snip---
for i in 1 2 3
do
time ./apachectl configtest
done
---snip---
2:17.23 on the first run, while it takes
3:21.92 on the second and
3:20.78 on the third run.

The network is 1gb ethernet, with jumbo frames 9000 and tests were run 
both on 4096 and 8192 rsize/wsize with more or less similar results.
Client is 2x AthlonMP 1800+, server is 2x AthlonMP 2200+, kernel on both 
is 2.4.26+Trond's linux-2.4.26.NFS.ALL patch,
mount is udp - essentially so, because this is meant to be a high 
availability setup.
The only real limitation is the rate at which the server can feed data 
to the client, since cpu is 31% on the first and 20% on the second and 
third runs.

Any ideas ? Any other info I can give that might help ?

Regards,
Thanos Chatziathanassiou



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