RE: [squid-users] Response time warnings...

> -----Original Message-----
> From: Henrik Nordstrom [mailto:hno@squid-cache.org]
> A lot of variation in response time is normal. The response time of a
> request depends on very many factors
>
> * The size of the request and reply. Large amounts of data takes
> significantly longer time to transmit than small amounts of data.
>
> * The "distance" of the requested information. If the requested
> information is on a slow or congested link then the response time
> will be a lot higher than if the requested information is on fast
> nearby connection.
>
> * Cache hit/miss. Cache hits is (or should at least)
> obviously faster
> than misses.
>
> And the average response time of Squid depends a lot on how much
> traffic your Squid has and whant kind of requests it is seeing.
>
> On a highly loaded Squid the response time generally averages out
> well, but on a Squid with not very many users the average response
> time is easily influenced by one or two very large or slow requests
> due to their size or connectivity of the requested information.
>
> Regards
> Henrik

----
Here is some data over the past hour or two -- it is odd because
there are so many duplicates and the averages seem to be so bad.
Notice at 10:42, the "Median" (isn't that the point at which
half are above and half are below?) jumps up to almost 3 minutes.
For seconds 43-51, I'm expected to believe all responses during the
previous minute ended at 178.492 seconds?  For 9 seconds any responses
that terminated terminated at near 3 minutes wait time?
I wish I could say these response times were abnormal, but they 
aren't.  This is why I was wanting to get in and break down the
details of what composed the final response time -- like how often
am I getting a 30ms response time fetched out of cache.  Is my
cache doing me any good or just slowing me down, overall.  I know
occasionally, I'll download a multi-meg file and the 2nd time
it runs through at nearly 200K/s out of the cache, but those
times are rare and far between.  
What's the point of getting out broadband when the response times
are measured in seconds for each item on the page?  I have a
SDSL-1.1, BTW, so max download speed is around 130KB/s, roughly.
I visit the same sites multiple times throughout the day, but it
seems so many have a do-not-cache bit set, or are at constant
addresses like "kdfjklsj.asp?ikjfioiu:ksdlfj;lkjfj" (or whatever), 
often varying with each 'session' (using addresses instead of
cookies to maintain state.
But it seem when things slow to a crawl, they *really* slow to a
crawl.  Pinging ISP shows normal response times.  Weirdness.
-linda