Thank you Amos for your valuable input on this. A copy of the runtime
information during peak times can be found here:
http://116.193.170.11/squid/squid_2008-11-17-213652-General-Information.html
I'm also attaching the following graphs:
1. Cache Hit Rate
(http://116.193.170.11/squid/squid-2008-11-17-2140-CacheHitRate.png)
2. Client Request Rate
(http://116.193.170.11/squid/squid-2008-11-17-2140-ClientRequestRate.png)
3. CPU IOWait
(http://116.193.170.11/squid/squid-2008-11-17-2140-cpuIOWait.png)
4. Service Timers
(http://116.193.170.11/squid/squid-2008-11-17-2140-ServiceTimers.png)
I'm also attaching a copy of my cache configuration.
http://116.193.170.11/squid/squid_2008-11-17-213652-config.html
Looking at it, can you suggest me if I can get any better performance than
it is? I think the IOWait is way too high, and I am using regular commodity
SATA HDDs.
Any input would be greatly appreciated.
Regards
HASSAN
----- Original Message -----
From: "Amos Jeffries" <squid3@xxxxxxxxxxxxx>
To: "Nyamul Hassan" <mnhassan@xxxxxxx>
Cc: "Squid Users" <squid-users@xxxxxxxxxxxxxxx>
Sent: Monday, November 17, 2008 07:01
Subject: Re: Large ACLs and TCP_OUTGOING_ADDRESS
Hi,
I run squid in an ISP scenario. We have got two identically configured
squid caches being load balanced among 4,000 users over a 50 Mbps link.
The
system runs quite well, although not without the occassional hiccups.
But,
there is a complain from users about not being able to access some
websites
because of same external IP. For this, we configured the squid.conf to
have
ACLs for different user blocks of /24 and have them mapped through
different
external IPs on each of these boxes.
However, not all /24 blocks have the same number of users, and I also
have
lots of real IPs still lying unused. I thought about creating different
ACLs for every 5 or 8 users, and then map them to different external IPs.
But, having them distributed in 8 IPs in each group would mean at least
500
separate ACLs and their corresponding TCP_OUTGOING_ADDRESS directives.
My question is, will this affect the performance of squid? Can squid
handle
this?
Depends on the ACL type. Squid should be able to handle many easily. of
the ACl you need; src is the fastest, next best is dstdomain, then dst. So
for a marginal boost when combining on one line, put then in that order.
Just look for shortcuts as you go.
My servers are each running on Core 2 Duo 2.33 GHz, 8 GB of RAM, 5 HDDs
(1x80GB IDE for OS, 4x160GB SATA for cache), total 256GB Cache Store
(64GB
on each HDD). One of the server's stats are (taken at a very low user
count
time):
Thank you. We are trying to collect rough capacity info for Squid whenever
the opportunity comes up. Are you able to provide such stats around peak
load for our wiki?
The info we collect can be seen at
http://wiki.squid-cache.org/KnowledgeBase/Benchmarks
Amos
