Date: Thu, 04 Jan 2007 12:53:59 -0500 From: Bob McIsaac <bobmc@bobmc.net> To: questions@freebsd.org Subject: Re: network tuning and performance troubleshooting Message-ID: <459D3F37.80002@bobmc.net>
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Josh Carroll wrote:
Problem: Browser status 'looking up address' for 10 seconds for any
web page clicked. Slashdot takes almost a minute to load. But FTP
performance is good and running a shoutcast stream is no problem.
Sending mail via my ISP is slow.
How about a large transfer over http with fetch or wget? Does it
perform as well as an ftp connection? It could be a DNS problem.
Try a
dig of slashdot.org and see what the query time is:
dig A slashdot.org | grep 'Query time'
Run that a few times and see how fast it's resolving. It should be
on
the order of a 100ms or less, at least after the first query.
Josh
$ dig A slashdot.org | grep 'Query time'
;; Query time: 95 msec
$ dig A slashdot.org | grep 'Query time'
;; Query time: 15 msec
$ dig A slashdot.org | grep 'Query time'
;; Query time: 7 msec
$ dig A slashdot.org | grep 'Query time'
;; Query time: 11 msec
$ fetch -v [1]http://www.freebsd.org/ports/growth/status.png
looking up [2]www.freebsd.org
connecting to [3]www.freebsd.org:80
requesting [4]http://www.freebsd.org/ports/growth/status.png
local size / mtime: 4725 / 1163039436
remote size / mtime: 4725 / 1163039436
status.png 100% of 4725 B 53
kBps
$ fetch -v [5]http://www.kde.org/screenshots/images/3.5/01-welcome.png
looking up [6]www.kde.org
connecting to [7]www.kde.org:80
requesting [8]http://www.kde.org/screenshots/images/3.5/01-welcome.png
remote size / mtime: 185546 / 1145367871
01-welcome.png 100% of 181 kB 177
kBps
$
The numbers above seem sensible for 'dig' but fetch is not reporting
the looking/connecting time which is seconds more than the
download time.
On google.maps the screen is divided into a grid and it takes a few
seconds
to fill in each one. I always thought it was a single image.
References
1. http://www.freebsd.org/ports/growth/status.png
2. http://www.freebsd.org/
3. http://www.freebsd.org/
4. http://www.freebsd.org/ports/growth/status.png
5. http://www.kde.org/screenshots/images/3.5/01-welcome.png
6. http://www.kde.org/
7. http://www.kde.org/
8. http://www.kde.org/screenshots/images/3.5/01-welcome.png
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