Subject: Re: Strange network performance problem with -current and 1.6_BETA1
To: Manuel Bouyer <bouyer@antioche.eu.org>
From: Markus W Kilbinger <kilbi@rad.rwth-aachen.de>
List: current-users
Date: 06/10/2002 22:20:32
>>>>> "Manuel" == Manuel Bouyer <bouyer@antioche.eu.org> writes:

    Manuel> On Mon, Jun 10, 2002 at 02:57:32AM +0200, Markus W Kilbinger wrote:
    >> [...]
    >> - If 'who' is a -current or 1.6_BETA1 machine (no matter what
    >> hardware, I see it with i386, alpha, sparc, macppc) ftp upload to
    >> the internet becomes incredibly slow (starting with about 80 kb/sec,
    >> falling down to about 10 kb/sec).

    Manuel> Did you look at differences in sysctl settings ?

Very good guess! The causing difference is:

  < net.inet.tcp.cwm = 0
  ---
  > net.inet.tcp.cwm = 1

It's '0' in 1.5_RC2 and '1' in 1.6*. What does this kernel
variable/flag mean? I didn't change anything in my config relating
this... So it's a new default in 1.6*?

Thanks for the right question! :-)

Markus.