Re: [squid-users] Re: refresh patterns!

On tis, 2007-08-14 at 18:07 +0100, RW wrote:

> Are refresh patterns very relevant to hit-rates?

Yes, refresh_pattern tune how long objects is considered fresh, and also
the tool to override HTTP freshness when needed..

> 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.

the cache acls can only further restrict what is cached, not make
uncacheable content cacheable.

Regards
Henrik