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Heavy LOAD on squid - system time

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Hello.
I am new to this list and new to squid under heavy load...
my problem is that squid spends 70% of CPU time in system.
the number is from top. ( 27.9% user, 66.8% system) and squid is the only thing running.
it has open around 2100 descriptors.
it is handlig around 300req/sec
most of the stuff from memory. (the descriptors to disk are around 10)

A big quietion is how much will help to move to 2.6.x kernel.
and if the answer is 10%, the next question is I NEED MORE :-) how... please. I noticited some info about select/poll but I couldn find info how much it changed in kernel 2.6. I have a litle problem with the kernel2.6 kernel and DELL PERC but that doesn't belog here.
I don't know how to get stats about the select/poll.
I did read the FAQ... etc.etc but you know... I could miss the answer.
I did not optimize -> /proc values, didn't find anything relevant
I.
I.
I.
.
.
.... sorry for the english :-))

system SPEC 2x.
Debian stable. 2.4 kernel.
Squid Cache: Version 2.5.STABLE9
1GB ram
2x15rpm disk  (6gb cache)
Intel(R) Xeon(TM) CPU 3.20GHz 1Mb cache
heartbeat,ntp,bind 2x100mbs

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