[Samba] nmbd causing very high CPU utilization

Jeremy Allison jra at samba.org
Wed Jun 26 13:18:01 GMT 2002

On Wed, Jun 26, 2002 at 03:51:54PM -0400, Windsor Dave (AdW/MOE2.1) wrote:
> Does anyone have any idea what can cause nmbd to begin gobbling CPU?
> We are running Samba 2.2.4 on HP-UX 10.20, having upgraded from Samba
> 2.0.10 about a month ago.  Our clients are a mixture of NT 4.0 and Win2K.
> Today, we have begun to see widespread client drive disconnections, and
> nmbd is averaging 60%+ CPU usage with peaks up to 100%.  We have heard
> reports of network problems at our site affecting clients that do not 
> connect to my HP/Samba servers, so I'm wondering if the high CPU usage 
> is a reflection of nmbd trying to cope with problems or a
> symptom that they might be causing them instead.  There seems to be nothing
> out of the ordinary in the nmbd log, but my client smbd logs are full of the
> infamous "Connection reset by peer" messages.  I have my site IS group
> investigating this (I'm in an engineering group, but we normally provide
> production IS support ourselves except for site-wide network issues), but
> have not heard from them yet.
> This particular server supports production at my manufacturing site, so
> I cannot easily shut it down.

Can you do the equivalent of an strace or truss onnmbd under HPUX 10.x ?
If so that may tell you what it is doing. Is the unexpected packet
database in unexpected.tdb growing ?


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