[squid-users] Slow speedtest results

[Alex Rousskov]

On 11/16/2017 12:18 PM, Evan Pierce wrote:

> Any idea why when using www.speedtest.net on my squid proxy ( squid
> 3.5.27 on Centos 6.9) gives consistently false/bad speeds while doing a
> speed test. The actual speed when downloading a file from a actual web
> server like say the microsoft website is consistently good (30Mb/s fiber
> - download speed 3.4MB/s) but a speed test done at the same time sits at
> around 3 to 4Mb/s. I have tried turning caching off and various other
> "tuning" settings on squid but nothing has fundamentally altered the
> speed. Running command line speedtest gives a correct speedtest from the
> squid host. Test machine was machine running firefox and chrome with the
> proxy statically configured and wasn't under any load. A similarly
> configured squid on smaller hardware and the same service provider runs
> consistently gives an accurate speedtest (same centos and squid
> versions). Any one have any ideas?

I trust you have checked cache.log, system log, and network interface
statistics for warnings, errors, and red flags unique to the non-working
use case.

Make sure that browser-proxy path is about the same in all tests you
compare. The problem might be related to browser-Squid communication.

Since you have a "working" case (on "smaller hardware"), I would try the
following using identical Squid versions:

1. Use the default Squid configuration with Squid memory caching
disabled on both boxes. Is one setup still a lot "slower" than the other?

2. Compare access.logs and mgr:info output of the two tests (one test
performed after a clean Squid start). Any unexpected differences?

3. If you have not already, test a Squid configuration identical to that
"working" case (you can rename directories/hostnames if really needed,
of course, but do not change anything you do not have to change). Is one
setup still a lot "slower" than the other?

4. Comparing cache.logs of virtually identically configured Squids with
debug_options set to ALL,3 or higher may expose the critical difference.
Debugging will slow Squid down a lot, of course, but perhaps you will
see that one of the Squids is doing something that the other one does
not do.


HTH,

Alex.