Hi,
I have another question regarding LM-factor.
---- qouted from Squid: The Definitive Guide
Responses that fall between the minimum and maximum are subject to Squid's
last-modified factor (LM-factor) algorithm. For such responses, Squid
calculates the response age and the LM-factor and compares it to the percent
value. The response age is simply the amount of time passed since the origin
server generated, or last validated, the response. The resource age is the
difference between the Last-Modified and Date headers. The LM-factor is the
ratio of the response age to the resource age.
Figure 7-2 demonstrates the LM-factor algorithm. Squid caches an object that is
3 hours old (based on the Date and Last-Modified headers). With an LM-factor
value of 50%, the response will be fresh for the next 1.5 hours, after which
the object expires and is considered stale. If a user requests the cached
object during the fresh period, Squid returns an unvalidated cache hit. For a
request that occurs during the stale period, Squid forwards a validation
request to the origin server.
------
"LM-factor value of 50%" Did he mean the percent in refresh_pattern or what?
What I understand is we should compare LM-factor with the percent which is
FRESH if "response age"/"resource age" < percent, else STALE. I don't
understand why the response will be fresh for 1.5h. Can someone explain this to
me?
Sorry for asking stupid question. Thank you.
ST
