Hello On Wed, Dec 29, 2010 at 11:09 PM, Gerard Blacklock <[email protected]>wrote:
> Sluggers, > > > In a nutshell, I found that on the debian lenny machine I could get at best > the equiv. to ADSL 1500 speeds, this was confirmed using ozspeedtest.comand > downloading a iso file from > mirror.aarnet.edu.au. Now, how do I know this is slow? I tried the same > modem on a laptop with windows and clocked out the speed test at the > 30mb/sec (cable extreme speeds). This lead me to do a few more tests, I got > hold of the latest version of knoppix 6.2.1 (which is damn awesome btw, the > last version I used was 5.01) and tried this on the same laptop and modem > setup, I got the same result as the windows result, full 30 mb/sec speeds. I > then downloaded the live version of debian and tried that, this time the > speed was a terrible ~1500kb/sec, basically the same as my current > installation on the gateway/proxy/firewall. > > So, after some research, I did find some information regarding the > disabling of IPV6 on debian that may help internet speeds however this was > mostly a few years old and I felt this was like crippling the future just to > get things to work now (i did try it though but made no difference in my > case) and plus I knew knoppix worked fine and gave me great speeds. I > definitely do not have that intricate knowledge of debian and knoppix to > really know what the cause of this is so I am wondering whether anyone else > has experienced this with debian or has any clues on how I can resolve it? > > I can get into more specifics about my setup and provide more information > as required. I am pretty sure I have isolated the issue down to debian, > however am open to other possible causes. > The IPv6 issues where mainly with firefox, and the symptoms were different to yours, mainly a page would take ages before it started to load, then it would load fast. Some issues that can cause problems are MTU and duplex mismatch. I don't think it's one of those, but they are easy to test. Run ifconfig and look at the traffic stats on eth0 (or whatever your network interface is), see if there are any errors or collisions. run ifconfig eth0 mtu 1000 and then try a download. ifconfig eth0 mtu 1500 to reset (if it was 1500 to begin with) It could be some weird tcp setting, have a look at /etc/sysctl.conf to see if kernel parameters are being set. If you're up for it, have a look at /proc/sys/net/ipv4 and compare between knoppix and debian to see if there are any differences. There's lots of files though, you can cat them to see the settings. Lastly, run tcpdump -nvvvi eth0 -s0 -c100 >/tmp/tcpdump.out then do a download, maybe use a pastebin to upload the data and link to it in a follow up post rather than pasting it into a message to the list. -- SLUG - Sydney Linux User's Group Mailing List - http://slug.org.au/ Subscription info and FAQs: http://slug.org.au/faq/mailinglists.html
