Re: [Ltsp-discuss] driving crazy on the networkspeed!

[Bill A. <waa...@re...>]

ibert wrote:
> Hi!
> 
> I´ve very big problems with some old HP Vetra XU90. I connect them via 3c905C 
> NICs.
> 
> The problem I have is that those clients aren´t able to manage 100 Mbit 
> Traffic correctly. First problem occured was the NFS pivot mount Problem 
> which I solved by editing the UDP packet Size. But as it seems, and seems to 
> be clear, this just cured one, and only one, symptom.
> 
> The next problem I had, after screwing on the UDP packet size, is that the 
> communication between Xserver and the clients. It´s that bad that the 
> machines aren´t usable (very very simple IceWM Desktop), because there are a 
> lot of delays in Input and Output on the terminal.
> 
> Another findig I have done, is that the machines work well, If I connect them 
> via 10Mbit network (Hub). So I´m looking now for a way to set the speed of 
> the NIC in the Client back to 10Mbps. Has anybody an idea on this?
> Is there an option which I can ad on the linuxrc, when insmoding the 3com 
> driver?
> 
> After searching around, I didn´t find any possibility to screw on the 
> packetsize (if there is something like that) for the Xserver-client 
> connection. Has anybody an idea on this?
> 
> I would be very happy on every hint, because I´m playing arround now for a 
> long time, and I don´t want to get frustrated (if I´m not already so...).
> 
> thanks
> Robert

Hi Robert... I am sorry to just jump in here because I have not seen
your previous posts... But, is there any chance you have a duxplex issue
bewteen the NIC and the 100Mbps switch?

Can you make 100% certain that:

1. Both NIC and switch ports are set to auto-negotiate and that they 
actually are negotiating the same speed & duplex settings?

or

2. Manually the nic to 100Mbps full duplex and the switch ports to 
100Mbps full duplex.

I have seen mismatched duplex issues cause more networking problems than
you can imagine. One of the classic symptoms is that things seem to work 
fine when taffic levels are low and everything falls to pieces at higher 
traffic levels.

I have also seen times where certain NICs would not properly 
auto-negotiate with certain switches etc...

I'd check there first.

Bill Arlofski
waa...@re...