RE: [squid-users] Requests through proxy take 4x+ longer than direct to the internet

Ah brilliant, thank you for passing this link along, it's very helpful!

Question then: Does the proxy server have a similar functionality as the
browser, that of limiting concurrent requests to a given domain (as
described in this article)?

What I want to know really is: Can I have my users bump up the number of
connections to the proxy server, or, by doing so, do I risk the proxy server
flooding a site and getting the proxies IP blocked?

What solutions have been employed in other scenarios, or are proxy servers
just inherently slower than direct connections due to this concurrent
connection issue?

Thanks,
David

-----Original Message-----
From: Amos Jeffries [mailto:squid3_at_treenet.co.nz]
Sent: Friday, March 19, 2010 1:06 AM
To: squid-users_at_squid-cache.org
Subject: Re: [squid-users] Requests through proxy take 4x+ longer than
direct to the internet

David Parks wrote:
> Hi, I set up a dev instance of squid on my windows system.
>
> I've configured 2 browsers (Chrome & Firefox), chrome direct to the
> internet, firefox through the locally running instance of squid.
>
> I expected similar response times from the two browsers, but I
> consistently see firefox (configured to proxy through squid) takes 4x+
longer.
>
> Below are the logs showing response times from a hit on yahoo.com, the
> chrome browser opened the page in ~<2 seconds.
>
> I have used the windows binaries of squid and configured digest
> password authentication, everything else (other than default port) is
> left as default in the config file.
>
> After doing a packet capture I noted the following behavior:
>
> - When going through the proxy: 9 GET requests are made, and 9 HTTP
> responses are received in a reasonable time period (<2sec)
> - After the 9th HTTP response is sent, there is a 4 second delay
> until the next GET request is made
> - Then 6 GET requests are made, and 6 HTTP responses are received
> in a reasonable amount of time.
> - After the 6th GET request in this second group there is a 5
> second delay until the next GET request is made.
> - This pattern repeats its self when the proxy is in use.
> - This pattern does not occur when I am not connected through the
proxy.
>
> Any thoughts on this behavior?
>

This blog article explains the issues involved:

http://www.stevesouders.com/blog/2008/03/20/roundup-on-parallel-connections/

Amos

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