On Tue, 14 Aug 2007 08:46:09 +0800 Adrian Chadd <adrian@xxxxxxxxxxxxxxx> wrote: > Would any other ISPs be willing to share their refresh patterns > and achieved request/byte hit rates for forward caching proxies? Are refresh patterns very relevant to hit-rates? When an object becomes stale, squid will verify it on the next access, which mostly results in a TCP_REFRESH_HIT, which is still a hit. You might argue that since it involves a round-trip it's a "second-class" hit as far as latency is concerned, but I can't see how refresh patterns have any significant effect on byte hit-rate. Modern browsers also seem to be much more restrained in how they reload, so I'm also a bit sceptical about reload-into-ims. I would have thought that most of the scope for improvement comes from the cache acls.
