From mboxrd@z Thu Jan  1 00:00:00 1970
From: Justin Schoeman <justin@expertron.co.za>
Date: Thu, 26 May 2005 13:49:52 +0000
Subject: Re: [LARTC] htb: HowTo identify squid cache hits
Message-Id: <4295D400.8080009@expertron.co.za>
List-Id: <lartc.vger.kernel.org>
References: <20050526133242.GA11315@sysop-2.atlascollege.nl>
In-Reply-To: <20050526133242.GA11315@sysop-2.atlascollege.nl>
MIME-Version: 1.0
Content-Type: text/plain; charset="us-ascii"
Content-Transfer-Encoding: 7bit
To: lartc@vger.kernel.org

I haven't tried this myself, but I see l7filter (l7-filter.sf.net) has 
patterns for matching cache hits and misses... This may just work for 
your application?

-justin


Peter Kaagman wrote:
> Hi list...
> 
> I work for a school in the netherlands with a 2mbit Internet uplink and
> about 3800 eager student who want to play games on the Internet using
> one of our 800 workstations.
> 
> Problem was that those game playing students are concentrated in 2 of
> our 6 physical locations... and they consumed the bandwidth which the
> other location would like to use for educational purposes.
> 
> The thing we did first was use squid... with success. The hit ratio on
> data transfer is 25-30%... "free" bandwidth.
> 
> Today I took the plunge and started to use HTB traffic shaping... and
> (to my surprise) I got it going without much troubles.
> 
> The setup I have chosen first divides the load over two classes:
> - one for Internet rate 2mbit and a 2mbit ceil
> - a second for our DMZ rate 98mbit and a 100mbit ceil
> 
> Next I sub-classed the Internet bucket into 6 classes each with a
> 333kbit rate and a 2mbit ceil.
> 
> This has had the effect that my DMZ can be accessed at full speed while
> they fairly share the Internet uplink.
> 
> And the way it looks now it works :D
> Hail to all those people who wrote those fine docs _o_
> 
> This is enough reason to address this list... just to say "Thank you!",
> but there is more.
> 
> At the moment I do not max out my Internet link... reason for this is I
> guess the squid proxy...
> The way it works now is that I have 2 types of filters in effect:
> - The DMZ: all packages with a src ip from my DMZ go to the big 98/100
>   bucket.
> - The Internet: all packages with a dst ip in one of our 6 networks
>   gets placed in one of the 6 333/2000 buckets.
> 
> But there is of course a src of packages I do not catch this way... and
> these are the squid cache hits. Because I filter on destination the cache
> hits get treated the same as cache misses. But cache hits are in effect
> local traffic... they do not originate from the Internet.
> 
> So here (finally) the question..
> Is there a way to identify cache hits from misses?
> 
> I took a look at the advanced filtering chapter of course, but am
> really dazzled by that (and I thought I understood TCP/IP a bit ;)).
> 
> Some further info that would perhaps help is that squid is run as a
> transparant proxy on the router/firewall.
> 
> regards
> 
> Peter Kaagman
_______________________________________________
LARTC mailing list
LARTC@mailman.ds9a.nl
http://mailman.ds9a.nl/cgi-bin/mailman/listinfo/lartc