Re: [tlug] Network performance

[Martin Ansat <martin_ansat@example.com>]

--- On Tue, 8/31/10, Romeo Theriault <romeo.theriault@example.com> wrote:
> Ansat <martin_ansat@example.com>
> wrote:
> >
> > So far I tried the following:
> >
> > 1.  Tried to tune the TCP window Size and related TCP
> tunings
> > 2.  Tried twiking various setting from different
> sources for switches on my network card. (like increasing
> MTU)
> > 3. Tuned IO performance, thinking that the bottleneck
> could be there. (hdparm, blah, blah)
> > 4. Tried different congestion control options in my
> kernel
> > 5. Ensured that there was no throttling or any
> degradation due to iptables (tried even disabling the whole
> thing)
> > 6. Ensured there where no conflicting services (turned
> down every possible service in order)
> 
> Have tried booting the system off of another distro's live
> cd (Fedora,
> Ubuntu, etc...) to see what kind of download speeds you get
> from
> those. 

Thank you for your reply Romeo
Well, I have not tried that yet because of a different issue. Since many distributions switched to Grub 2, my machine stop beign able to boot these live CDs.
Not a good excuse, I'll get something that can boot and get back to you on this.

>I very highly doubt this is a general linux issue,
> more likely
> an issue with something in your gentoo setup, but the live
> cd could
> help prove this point.

yep, actually I never though it has to do with the Linux networking stack but more with my config.

> Also, what software are you using to download on both OS's?
> what
> protocol are you using? While this likely isn't a

Tried many things 
example:

 wget ftp://gentoo.gg3.net/pub/ISO/6.2-RELEASE-amd64-bootonly.iso
--2010-08-31 13:46:21--  ftp://gentoo.gg3.net/pub/ISO/6.2-RELEASE-amd64-bootonly.iso
           => `6.2-RELEASE-amd64-bootonly.iso'
Resolving gentoo.gg3.net... 122.249.91.102
Connecting to gentoo.gg3.net|122.249.91.102|:21... connected.
Logging in as anonymous ... Logged in!
==> SYST ... done.    ==> PWD ... done.
==> TYPE I ... done.  ==> CWD (1) /pub/ISO ... done.
==> SIZE 6.2-RELEASE-amd64-bootonly.iso ... 27447296
==> PASV ... done.    ==> RETR 6.2-RELEASE-amd64-bootonly.iso ... done.
Length: 27447296 (26M) (unauthoritative)

77% [==============================>     ] 21,222,152  1.67M/s  eta 4s 

And of course used ftp as well in Windows. Note that I have also tried on the LAN with same results. (I am also ensuring there are no sorts of caching affecting the resaults) 
 
> filesystem I/O issue
> you could always try directing your download output to
> /dev/null to

Good idea, 
wget -O /dev/null ftp://gentoo.gg3.net/pub/ISO/6.2-RELEASE-amd64-bootonly.iso46% [========================>  ] 12,642,170  1.69M/s  eta 9s  

Same story.

Thanks.