Re: [squid-users] SNMP counters for bytes in hits/misses

ons 2009-10-28 klockan 08:36 -0400 skrev Brian J. Murrell:
> It would be nice to have SNMP counters that tracked cache hits and
> misses in terms of the number of bytes. This would allow me to see
> effective my proxy was at avoiding network traffic.

There is, kind of.

SavedBandwidth = cacheHttpOutKb - cacheServerInKb

but remember to do the calculation on delta values (i.e. difference over
5 minutes) as both are counters and will wrap around to 0 at some
point...

> That said, I'm unsure how I would account for requests to a web servers
> to test for object freshness, given that that is not a client request
> per se but rather a cache server "management" (or overhead).

The above is pretty neutral on the subject, giving the difference in
bandwidth usage.

the distinction between hit/mis is quite blurred which hits also using
upstream bandwith (cache revalidations), and will be more blurred over
time when we add support for partial responses..

Regards
Henrik
Received on Sat Nov 07 2009 - 20:32:51 MST