vsftpd quirkiness

[James Wilkinson]

Roy W. Erickson wrote:
> Today I upgraded my FC2 (now at kernel 2.6.7-1.494.2.2smp). I then went
> to test out the vsftpd server (default versions delived by Fedora
> installations and upgrades) I have running on it and I had a few
> problems that did not seem to be present when I installed the machine
> new + upgrade 1 month ago (kernel 2.2.6-1.494.2.2).
> 
> The first post-upgrade transfer of 53 MB file size, from an XP client
> (smartftp) to the server, ran at 'normal' speeds (4700KB/s). The next
> transfer, also in the same direction, slowed to a crawl of about
> 22KB/sec. Nothing transfered at any speed after that!
> 
> I rebooted the server, made sure i turned off iptables, and tried again.
> Same thing but even the first attempt was slow. I noticed I could get
> stuff off the server (opposite direction) at the normal rates. 
> 
> Booted to kernel 2.6.7-1.494.2.2 (non smp) and the same thing.
> 
> Booted to kernel 2.6.6-1.494.2.2 (smp?) and things seemed back to
> normal.

You could be seeing the effects of TCP scaling.

http://lwn.net/Articles/92727/

James.

-- 
E-mail address: james | "It has taken 24 years to get the Reichstag wrapped.
@westexe.demon.co.uk  | Chancellor Kohl said it would only be wrapped over
                      | his dead body, so sensing an opportunity the
                      | Bundestag outvoted him."  -- The Guardian