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Slow Linux 2.2.x Telnet?
RelliK asks:
"I have a small LAN at home, 4 workstations and a gateway
sharing a cable modem. My workstation is running SuSE
6.1 and the gateway is running Debian 2.1. Both machines
are using the 2.2.9 kernel. The problem is that telnet and
rlogin from my workstation to the gateway is slow to the
point of being absolutely unusable. It takes several seconds
for a character to appear on the sccreen after I type it.
FTP is also jerky: It transfers files fast, but it appears
as though it's constanly "hitting speed bumps", so to speak,
especially when it's about 95% done. I've tried everything
I could think of to fix the problem, but no luck. I'd
*greatly* appreciate it if any of you could help me."
Now this just sounds downright strange. Does anyone have
any ideas as to what's causing this? Click below for more.
Rellik gives more details on his problem:
"I know it is not a network problem. Telnet from other machines to the gateway works fine. It is not a problem with my hardware either. When I telnet from windows it works fine. Also, if I boot the gateway with kernel 2.0.36, it works fine. So it appears as though the two boxes have problems talking to each other when both are running 2.2.x (doesn't seem to matter which since I tried it with 2.2.5 before). Also, if I telnet from my workstation to the outside, bypassing the gateway, it works fine. It also works if I telnet from the gateway to my workstation. And here is the weirdest thing: if I run tcpdump or iptraf while I'm telnet'ing it works fast!! But as soon as I stop them it starts crawling again...
Rellik gives more details on his problem:
"I know it is not a network problem. Telnet from other machines to the gateway works fine. It is not a problem with my hardware either. When I telnet from windows it works fine. Also, if I boot the gateway with kernel 2.0.36, it works fine. So it appears as though the two boxes have problems talking to each other when both are running 2.2.x (doesn't seem to matter which since I tried it with 2.2.5 before). Also, if I telnet from my workstation to the outside, bypassing the gateway, it works fine. It also works if I telnet from the gateway to my workstation. And here is the weirdest thing: if I run tcpdump or iptraf while I'm telnet'ing it works fast!! But as soon as I stop them it starts crawling again...
Detailed specs:
My workstation:
Cyrix 6x86PR-200
64 Mb SDRAM
Asus TX97e motherboard
6 gig hd
ATI 3d Pro Turbo video card
PCI ne2000 compatible network card (RealTek chip)
SuSE 6.1 / kernel 2.2.9
The gateway:
AMD 486dx4-100
32 Mb RAM
1.2 gig HD
Trident 1Mb PCI video card
2x PCI ne2000 compatible network cards (RealTek chip)
network: coax ethernet
Thanks for any help in advance!"
I'm happy with NE2000 clones as they seem to meet my needs. Between the PCI Realtek NE2000 clone on my workstation and the PCMCIA NE2000 clone on my laptop, they ftp about 1MBs between eachother when transferring ISO images. All that between 75 feet of cheap 8 conductor telephone cable too.
The only problem I have had was an ISA NE2000 clone had a problem with my P2B motherboard that is seriously overclocked. It would for some reason not load the address into the card causing the kernel to report the transmitter was busy. It migh have been something to do with the wait states on the bus, but I did not mess with them that much...