RE: 3c905-errors

> -----Original Message-----
> From: [email protected] [mailto:[email protected]] 
> On Behalf Of Steven Timm
> Sent: Monday, October 06, 2003 10:15 PM
> To: [email protected]
> Subject: [vortex] 3c905-errors
> 
...
> These errors are associated with increases in the count of 
> transmit carrier errors in /proc/net/dev.  They do, for about 
> a minute, lead to loss of network connectivity with the node. 
> The node usually recovers afterwards and the connections 
> proceed on as normal. However, transfers which timed out 
> during this time are not necessarily restarted and it does 
> cause trouble.  The link light of the NIC goes out during 
> this time.  We have seen this problem happen on all of 240 
> different nodes in a cluster, and have hooked up test nodes 
> to a variety of different network switches.  The problem 
> happens with all of them.  Interestingly enough, the switch 
> does not record any errors in its error counters during these 
> episodes. We have investigated the physical layer thoroughly 
> and not found any problems up until now.  Is there any idea 
> what may be causing this problem..in particular is there any 
> record that Tyan may have misconfigured this NIC when they 
> put it on their board?
...
A stupid question - some intelligent switches support "broadcast storm"
control. It usually disables temporary switch ports with extremely high
packet rate going into the switch. Do you have such functionality in the
switches you use?

Anastas Giokov


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