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<== Date ==> <== Thread ==>

Subject: Waiting for mbufs on RTEMS
From: Matt Rippa via Tech-talk <tech-talk@aps.anl.gov>
To: Talk EPICS Tech <tech-talk@aps.anl.gov>
Date: Mon, 3 Dec 2018 12:01:11 -1000
Hi all,

Our telescope control system is on an MVME2700, EPICS 3.14.12.7 and RTEMS 4.10.2. We've seen a few events in the last several months of starved mbuf's.  There are two main failure paths:

1) If we burden the IOC by calling debug utilities with higher interest levels like dbcar "" 10, or casr 2, we can see CA Client screens go white. Sometimes the system will recover by itself over time.

2) Without iocsh or human interactions, the system can start screaming about mbufs before halting without a stack trace.

We nfsmount a single directory in the startup script. These RPCIO messages below are related to the nfs server on RTEMS I believe.

Should we be resizing the default mbuf capacity? If so, how can we best do this?

Thanks,
-Matt   

Nov 30 16:28:40 : RPCIO: server '10.2.2.57' not responding - still trying
Nov 30 16:28:43 : NFS (proc 1) - RPC: Timed out
Nov 30 16:28:47 : Still waiting for mbuf cluster.
Nov 30 16:28:47 : Still waiting for mbuf cluster.
Nov 30 16:28:47 : Still waiting for mbuf cluster.
Nov 30 16:28:47 : Still waiting for mbuf cluster.
Nov 30 16:28:47 : Still waiting for mbuf cluster.
Nov 30 16:28:47 : Still waiting for mbuf cluster.
Nov 30 16:28:47 : Still waiting for mbuf cluster.
Nov 30 16:28:47 : RPCIO: server '10.2.2.57' not responding - still trying
Nov 30 16:28:47 : Still waiting for mbuf cluster.
Nov 30 16:28:48 : Still waiting for mbuf cluster.
Nov 30 16:28:48 : Still waiting for mbuf cluster.
Nov 30 16:28:48 : Still waiting for mbuf cluster.
Nov 30 16:28:51 : NFS (proc 1) - RPC: Timed out
Nov 30 16:28:54 : RPCIO: server '10.2.2.57' not responding - still trying
--


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