While i can use the full speed of our connection (100MBit) between my two Gentoo
machines it falls down to 0.1% of the speed if i try to connect to a Debian or
Mandrake system. Debian and Mandrake are able to speak with each other at normal
This problem occured in smbfs & ssh connections. I checked it as well with netperf:
Recv Send Send
Socket Socket Message Elapsed
Size Size Size Time Throughput
bytes bytes bytes secs. 10^6bits/sec
87380 16384 16384 11.27 0.06
And to the other gentoo machine:
87380 16384 16384 10.01 93.94
I'd be glad to help out finding the solution to this bug, but it is quite
strange. Even shutting down the firewall did not help.
Steps to Reproduce:
1.scp a file to another machine
2.try to copy files over smbfs mounted filesystem
Have you try to change physical things like:
changing tp-cabel, port in switch and nic?
Just personal experience where you get some traffic through, but not bursts.
Are these machines on the same subnet? Same switch/hub? Are they all using
good quality Cat5 cables?
Any of these factors could be affecting your network throughput, not just the
operating systems. For example, if your Gentoo boxes are on a different switch
than the Debian and Mandrake ones, there could very well be some slowdown
related to poor/old wiring. Also, if some are behind a NAT, slowdown will occur
You should also check to be sure you don't have any odd policies set up on one
or the other set of machines (some sorta proxy/firewall may be causing trouble).
are you doing any tweaking of TCP parameters?
in some cases the parameters can cause very bad performance when they are
communicating with other machines that can't match the params.
I tried changing physical things: no result
The machines are on the same switch.
We checked the TCP parameters. This was a Gentoo installation without any
modifications. The weird thing is that Debian and Mandrake cause the problems,
if it was only one of them i'd say its their fault. This way it seems like if
something goes wrong with the Gentoo machine i have. And the problem occurs on
both of my Gentoo machines (one amd64, one x86)
Closing NEEDINFO, until/if there's enough information to reproduce the problem.