[Beowulf] InfiniBand VL15 error

Gilad Shainer Shainer at mellanox.com
Tue Dec 2 11:01:49 PST 2008

I can try to help you here, and would need to understand your setup and
on which port the drop is occurring on.  Bad cable causing this seems
very unlikely.


-----Original Message-----
From: beowulf-bounces at beowulf.org [mailto:beowulf-bounces at beowulf.org]
On Behalf Of Prentice Bisbal
Sent: Tuesday, December 02, 2008 7:24 AM
To: Beowulf Mailing List
Subject: [Beowulf] InfiniBand VL15 error

I'm getting this error when I run ibchecknet on my cluster:

#warn: counter VL15Dropped = 476        (threshold 100) lid 1 port 1
Error check on lid 1 (aurora HCA-1) port 1:  FAILED

I've googled around this morning, but haven't found anything helpful.
Most of the hits turn up code with the phrase "VL15Dropped", but nothing
explaining what this error means, what causes it, or how to fix it.

After clearing the counters with 'perfquery -r', the VL15Dropped count
starts increasing from zero almost immediately.

Any ideas what this error represents or how to fix? Could it be a bad

Beowulf mailing list, Beowulf at beowulf.org To change your subscription
(digest mode or unsubscribe) visit

More information about the Beowulf mailing list