[Bug 422518] [NEW] rt2500pci wifi driver and slow SSH connection
Mark Bennett
mark.bennett17 at btinternet.com
Tue Sep 1 13:08:58 BST 2009
Public bug reported:
IBM Thinkpad T23 with Comtrend PCMCIA wifi adapter. Wifi adapter
purchased from Linux Emporium (Solihull, UK) and certified as Linux
compatible, which so far is correct. Wifi adapter immediately recognised
by Laptop and immediately connects to wifi DHCP router. Package
installation via Synaptic and Update Manager very quick. Likewise web
surfing very quick. The card is reported in lspci as follows:
03:00.0 Network controller: RaLink RT2500 802.11g Cardbus/mini-PCI (rev
01)
iwconfig reports:
wlan0 IEEE 802.11bg ESSID:"BTHomeHub-E2AF"
Mode:Managed Frequency:2.462 GHz Access Point: 00:14:7F:9B:F3:F7
Bit Rate=54 Mb/s Tx-Power=18 dBm
Retry min limit:7 RTS thr:off Fragment thr=2352 B
Power Management:off
Link Quality=73/100 Signal level:-40 dBm
Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0
Tx excessive retries:0 Invalid misc:0 Missed beacon:0
Network Manager>Connection Information reports:
Auto BTHomeHub-E2AF (default)
Interface: 802.11 Wifi (wlan0)
Hardware Address: 00:0F:EA:ED:D3:64
Driver: rt2500pci
Speed: 1Mb/s
Security: WEP
IP Address: 192.168.67
Broadcast Address: 192.168.1.255
Subnet Mask: 255.255.255.0
Default Route: 192.168.1.254
Primary DNS: 192.168.1.254
Problem:- Connection via openssh either as client or server machine is
very slow. Transfer of files lasts for about 10 seconds at 500kb/s but
then rapidly slows to 60kb/s resulting in anticipated file transfer of
1.2GB of data to take 19 hours. Left laptop overnight but in the morning
the transfer across SSH had failed. Tried the laptop connected to 2
different Ubu machines. One running 8.04 and connected to router via
ethernet cable. The other wifi connected running 9.04. The laptop has
the same deceleration issue regardless of which machine it's trying to
SSH with. The other machines in the network (both Ubu) transfer at 4MB/s
across SSH with each other. One has an internal Belkin PCI wifi card
(purchased from same vendor). The other is connected via ethernet cable.
Transfer rates between these two other machines are fast and constant.
The issue appears to be the laptop and I would guess the wifi driver
having a problem with SSH. To test the laptop I've removed the wifi card
and connected an ethernet cable. With this configuration SSH speeds of
constant 3.8MB/s achieved and files successfully transferred. I can only
conclude that the wifi driver is somehow losing packets resulting in the
rapid deceleration and then settling to the very slow 60Kb/s transfer
speed?
To double check the above issue I have done a complete fresh install of
9.04 onto the laptop and installed all the updates via Update Manager.
The SSH transfer issue is repeated.
ProblemType: Bug
Architecture: i386
DistroRelease: Ubuntu 9.04
Package: ssh 1:5.1p1-5ubuntu1
PackageArchitecture: all
ProcEnviron:
LANG=en_GB.UTF-8
SHELL=/bin/bash
SourcePackage: openssh
Uname: Linux 2.6.28-15-generic i686
** Affects: openssh (Ubuntu)
Importance: Undecided
Status: New
** Tags: apport-bug i386
--
rt2500pci wifi driver and slow SSH connection
https://bugs.launchpad.net/bugs/422518
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