[AG-TECH] Linux networking problems

[Markus Buchhorn]

At 09:56 AM 25/07/2001 -0500, Linda Winkler wrote:
>check that full duplex was negotiated correctly
>between host and switch
>lw

No - better than that - force it, on both ends. I have yet to see 100% 
successful negotiation on any switch, both for link speed (go figure) as 
well as duplexity. Usually close, but never quite 100%. At the very least 
lock the switch port to it. I wouldn't even trust some switches to report 
it correctly to the UI, or accept what the client NIC tells it to do.

Bitter experience.

Cheers,
         Markus

>At 09:19 AM 7/25/2001, Kay Gunn wrote:
>
>>I have noticed some weird behaviour/poor network performance on my Linux
>>audio and video capture stations.  They are running the AG 1.0 linux 6.2
>>OS downloaded from ftp://ftp.mcs.anl.gov/pub/AG/redhat-2001-0614-0732.iso.
>>In one machine I have an Intel PCI EtherExpress Pro 100 network card, in
>>the other a PCI 3c905c Tornado.  They are both set to run full duplex
>>100MB and are hooked up to the same switch as a Redhat linux 7.1 ftp
>>server.  When ftping files btw the grid nodes and my ftp server, I get a
>>transfer rate of less than 3MB/second on each machine.  Doing the same
>>transfer btw the ftp server and 2 different machines on the same switch
>>running Redhat 7.1 with the same PCI 3c905c Tornado cards set to 100MB
>>full duplex, I get a transfer rate of 11MB/sec. I've run these tests
>>multiple times and always get the same results.
>>
>>Basically I'm getting much better thruput with 7.1.  Anyone have any ideas
>>as to how to fix this with the AG release?
>>
>>------
>>Kay Gunn

Markus Buchhorn, Faculty of Engineering and IT,          | Ph: +61 2 61258810
email: markus.buchhorn at anu.edu.au, mail: CSIT Bldg #108  |Fax: +61 2 61259805
Australian National University, Canberra 0200, Australia |Mobile: 0417 281429