Experimental Physics and
Industrial Control System

"Jeff Hill" <[email protected]> · Tue, 17 May 2011 09:57:31 -0600

> Cexp>CAS: TCP_NODELAY option set failed
>

If this happens only rarely, in isolated situations, then maybe an
explanation is that the network kernel is somehow temporarily starved for
resources, or otherwise if the situation persists then perhaps the network
kernel was somehow comprised. In a vxWorks system lacking mmu protection
there could be a number of scenarios. I nevertheless had a quick look at the
code and I don?t see any obvious causes of trouble.

Jeff
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> -----Original Message-----
> From: [email protected] [mailto:[email protected]]
> On Behalf Of Michael Davidsaver
> Sent: Tuesday, May 17, 2011 8:55 AM
> To: [email protected]
> Cc: Chabot, Daron
> Subject: TCP_NODELAY option set failed
> 
> Cexp>
> Cexp>CAS: TCP_NODELAY option set failed
> 
> I happened to notice this error in the log of one of our IOCs.  I've not
> seen it before.  It only happened once, but seemed suitable strange to
> be worth reporting.
> 
> EPICS 3.14.11
> RTEMS 4.9.3 on a mvme3100
> 
> Also deviocstats and the new mrfioc2 timing driver.  The IOC was
> functioning correctly when I checked it.
> 
> It looks like this error comes from create_tcp_client() in
> caservertask.c when setsockopt() for the NODELAY socket option fails for
> a newly connected CA client.  Since I only see one message I assume the
> client was able to connect successfully on a retry.
> 
> Has anyone else seen this error?
> 
> 
> Thanks,
> Michael

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System