re: port-sparc64/51647: deadlock in NFS client with UDP (IPv4) on sparc64

[matthew green <mrg%eterna.com.au@localhost>]

The following reply was made to PR port-sparc64/51647; it has been noted by GNATS.

From: matthew green <mrg%eterna.com.au@localhost>
To: gnats-bugs%NetBSD.org@localhost
Cc: port-sparc64-maintainer%netbsd.org@localhost, gnats-admin%netbsd.org@localhost,
    netbsd-bugs%netbsd.org@localhost, rokuyama%rk.phys.keio.ac.jp@localhost
Subject: re: port-sparc64/51647: deadlock in NFS client with UDP (IPv4) on sparc64
Date: Fri, 25 Nov 2016 07:48:45 +1100

 >  > This problem is completely reproducible. It occurs both with on-board
 >  > (gem) and PCI (re) ethernet adapters.
 
 i've never been able to use the gem driver fully stable on sparc64.
 for non-nfs root it would eventually soft hang and need an
 'ifconfig gem0 down up' to bring it back.  for nfs root, this usually
 meant a soft hang i couldn't recover from (soft hang, meaning that i
 could enter ddb.)  i've lost what trust in the the re(4) hardware i
 had after the 4th or 5th card failed after 3 years of service.
 
 i have successfully use wm(4), hme(4) and, in -current, bge(4) on
 sparc64 and nfs.  oh, and le(4) but that was long ago :)
 
 
 .mrg.