Tuning Squid

methanigai · 06-12-2009, 08:51 AM

Hi ,

I am facing some performance issues in squid .

i.e. I have Debian etch with squid,squidguard,shorewall.
Internet is working in normal speed if clients are approx 50 .
If clients are approx 70 -100 it is getting very slow.

I googled for tuning and done the following things,
redirect_children 10
cache_dir ufs /var/spool/squid 1000 16 256
cache_mem 48 MB
pipeline_prefetch on
fqdncache_size 2048
maximum_object_size 8192 KB

Can you please suggest me how can i improve much ?

FYI : We have Leased line .so we are getting constant bandwidth.
We are running the server in desktop HP Compaq with 4GB RAM, Core2Duo

Thanks,
MThanigairajan

pliqui · 06-12-2009, 10:21 AM

What other services you are running on the server, because you could increase the cache_mem and the maximum_object_size_in_memory to increase the TPC_MEM_HIT if you can spare the ram.

Quote:

GDSF gives priority to smaller objects that have a better chance of getting hit. LFUDA is more like LRU, but employs a dynamic aging mechanism that is said to be more efficient than recent usage. Generally, GDSF produces a higher hit rate, while LFUDA reduces WAN bandwidth use.

Also you can try the cache_replacement_policy heap GDFS instead of the default LFUDA

Check This page and this section

Code:

Ok, that's all for squid configuration.  Now there's one last thing to do to complete the picture.  You need to edit your squid startup script to include the following two lines:

ulimit -HSn 8192 echo 1024 32768 > /proc/sys/net/ipv4/ip_local_port_range

This will raise the file descriptor limit for the squid process, and will open up a ton of IP ports for use by squid.  It won't need quite this many, but better safe than sorry.

That could help. Cheers