[squid-users] High loads on linux box running squid - tuning

Hi all,

Im running squid on HP Proliant DL360 (3.06Ghz Xeon / 1Gb ram / 2x 15K disks in raid1)

We have around 2000-2500 concurrent clients at daytimes

We recently upgraded the squid box from 866Mhz PIII / 1Gb of ram. It had 100% cpu loads all the time and it was...slow :)

After i upgraded the box to the 3Ghz Xeon its still performing pretty much the same (Loads from 0.80 to 2.00). Now i am running Squid 2.5.STABLE3-6.3E2 (from RHEL 3 Update 4). I am by no means a squid expert (go figure:) but here are the parameters i have changed from defaults (after googling for awile).

cache_mem 128 MB
cache_swap_low 80
cache_swap_high 100
maximum_object_size 1024 KB
cache_dir aufs /var/spool/squid 4000 16 256 (i know i do not have alot of cacheing space, but this is a temp proxy solution)
cache_store_log none
request_body_max_size 12 MB
half_closed_clients off

The system is running 2.4.21-27 in non hyperthreading mode. (1 cpu)

Is there anything i can do to quickly lower the load? How many users can one put on a box like this? I have been google-ing alot and have seen talk about 2500-5000 on one box, not unlike this one. Is this wrong?

Kær kveðja / Best regards,
Finnur Ö. Guðmundsson
System Engineer - System Operations
fog@t.is

TM Software - Skyggnir
Holtasmári 1, IS- 201 Kópavogur, Iceland
tel: + 354 545 3000-fax + 354 545 3001
www.t.is

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Received on Thu Feb 17 2005 - 01:36:35 MST