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Re: [Debian-NYC] debugging network slowness



On 12/15/2010 04:10 PM, steve beltzer wrote:
> However, I really would like to be able to start using Debian more and I am
> wondering what can be done to get my browser up to speed....  Is it some
> sort of mis-communication between Iceweasel and my internet connection?

i understand being frustrated -- it certainly sounds frustrating to me!

to recap:

 * we've been using http://nytimes.com as the test site

 * during these tests, there has been no detectable shortage of
resources on the local machine (disk I/O well below capacity,
filesystems nowhere near full, lots of free RAM and idle CPU).

 * iceweasel on debian takes minutes to load the Times' front page,
though firefox under Win7 takes around 15 seconds.

 * wget takes far too long to do something as simple as loading an http
redirect. (15 seconds just to fetch the redirect from
http://nytimes.com/ to http://www.nytimes.com/)

 * DNS on its own does not seem to be the problem: directly querying the
local nameservers with dig returns results very quickly (~0.02 to 0.04
seconds), and all three nameservers in resolv.conf are at comparable speeds.

 * TCP connections on their own do not seem to be the problem: using
netcat to connect to the times' site and fetch the same 302 redirect is
also trivially quick (less than a tenth of a second)

 * The behavior depends on which network you are using (the cafe works
fine; home and eyebeam were problematic).

 * You have Atheros ethernet controllers: wired AR8132 (rev c0) and
wireless AR9285 (rev 01)

Is this all correct?  I confess i'm a bit stumped.  I'd be inclined to
try network packet captures next, but i don't really know what i'd be
looking for.

Anyone have any other suggestions?

	--dkg

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