[ILUG] Squid vs Browser cache

[Subba Rao]

On  0, Fergal Daly <fergal at esatclear.ie> wrote:
> 
> Squid could be checking the last modified time of the page to make sure
> there isn't a more recent one before serving the cached copy. If you look
> in the squid logs, every entry gives a size, if the size is around 4-5
> hundred bytes then it means that it just checked the change time but didn't
> download the page.
> 

One other thing I wanted to point out was about accessing cache. Please look
at the following messages to the same site from 2 different machines.


 From Linux:

950968381.349   1293 127.0.0.1 TCP_MISS/200 4390 GET http://www.squid-cache.org/ root DIRECT/www.squid-cache.org text/html
950968383.566   1939 127.0.0.1 TCP_MISS/200 2125 GET http://www.squid-cache.org/Icons/squidnow.gif root DIRECT/www.squid-cache.org image/gif
950968383.706   2036 127.0.0.1 TCP_MISS/200 856 GET http://www.squid-cache.org/Icons/cache_now.gif root DIRECT/www.squid-cache.org image/gif
950968384.345   2842 127.0.0.1 TCP_MISS/200 10902 GET http://www.squid-cache.org/Squidlogo2.gif root DIRECT/www.squid-cache.org image/gif


 From NT:

950968451.495      2 127.0.0.1 TCP_MEM_HIT/200 4398 GET http://www.squid-cache.org/ root NONE/- text/html


What the TCP_MISS and TCP_MEM_HIT flags? For the NT machine, the page is instantly
delivered, but for Linux Squid fetches the page. Both the machines are pointing to
the same port on the Linux box.

Subba Rao
subb3 at attglobal.net
http://pws.prserv.net/truemax/

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