Gentoo Websites Logo
Go to: Gentoo Home Documentation Forums Lists Bugs Planet Store Wiki Get Gentoo!
Bug 99676 - network connection (ssh & smbfs checked) very slow to non gentoo machines
Summary: network connection (ssh & smbfs checked) very slow to non gentoo machines
Alias: None
Product: Gentoo Linux
Classification: Unclassified
Component: [OLD] Unspecified (show other bugs)
Hardware: All Linux
: High normal (vote)
Assignee: Gentoo Linux bug wranglers
Depends on:
Reported: 2005-07-20 06:56 UTC by Kai Schlüter
Modified: 2005-08-29 07:59 UTC (History)
2 users (show)

See Also:
Package list:
Runtime testing required: ---


Note You need to log in before you can comment on or make changes to this bug.
Description Kai Schlüter 2005-07-20 06:56:09 UTC
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.

Reproducible: Always
Steps to Reproduce:
1.scp a file to another machine
2.try to copy files over smbfs mounted filesystem
Comment 1 Stian Skjelstad 2005-07-24 08:08:23 UTC
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.
Comment 2 Mike Kelly 2005-07-24 11:08:13 UTC
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
as well.

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).
Comment 3 Robin Johnson archtester Gentoo Infrastructure gentoo-dev Security 2005-07-27 00:40:40 UTC
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.
Comment 4 Kai Schlüter 2005-07-27 00:55:25 UTC
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)
Comment 5 Jakub Moc (RETIRED) gentoo-dev 2005-08-29 07:59:42 UTC
Closing NEEDINFO, until/if there's enough information to reproduce the problem.