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List:       squid-users
Subject:    Re: [squid-users] Squid + MySQL ?
From:       Chris Robertson <crobertson () gci ! net>
Date:       2009-07-31 23:42:41
Message-ID: 4A738171.6020706 () gci ! net
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Marcello Romani wrote:
> Il Friday 31 July 2009 17:29:51 Maxime Gaudreault ha scritto:
>   
>> After all logs entries are in the database I need to calculate how much
>> bandwidth has been saved by squid. What HTTP Code tells me that the
>> object came from the cache ? Everything with HIT in it ? TCP_HIT,
>> TCP_MEM_HIT, TCP_NEGATIVE_HIT ?
>>     
>
> Don't know about NEGATIVE_HIT, but I would add TCP_DENIED to the list.
>   

While it is served from the cache, there is no way to calculate 
bandwidth savings associated with a TCP_DENIED*.  By the same metric,  
TCP_NEGATIVE_HIT is served from the cache and has a size associated with 
it and seems like a valid bandwidth savings metric to me.

> Just my 2 (euro)cents.
>   

Ditto.  Except US currency.

> Marcello
>   

Chris

* Ostensibly one could determine the size of the denied object to 
determine the immediate/minimal bandwidth savings, but that would ignore 
the possibility of the denied object referencing CSS, JavaScript, 
images, etc. that a browser might further have requested.  Further, the 
object size would have to be determined out-of-band and (if an accurate 
Content-Length header was not provided) might require downloading the 
object which would negate the savings.  *shrug*

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