Ken Fowler ([log in to unmask]) wrote:
: We have an interesting problem, and are looking for a solution ..
 
: Users at a customer site are connecting to an HP 987 (MPE/iX 5.0), via
: DTC and network connections (using Minisoft).  The problem is that
: block-mode applications pause for 2-10 seconds at random intervals when
: repainting the screens.  This happens at all PC's accessing the system
: through the network, and on block mode applications only.
 
: It does not happen to the same  users when accessing the system from a
: terminal connected to the DTC.
 
: HP has logged in several times and have told us:
:         - all relavent patches are properly installed
:         - no hardware problems on LAN
:         - no swapping or CPU limitations (it happens on weekends, also)
:         - no NS timing issues
:         - no errors in any of the log files
:         - No network errors or  utilization problems
 
- Are you sure HP has made sure that:
 
  1) subsystem 3 (network transport) has all logging enabled to disc?
  2) switched the nmlg-file with update option to have logging config
     changes effective (:SWITCHNMLOG UPDATE)
  3) re-produce the problem
  4) switch NMLG-file again
  5) have a look into NMLG-file that was active while pbm was re-produced
     looking for TCP retransmissions?
 
  I'd be damned if there weren't any.  If there truely aren't and the HP3000
  LINKTRACE shows that all packets were sent and no retransmissions occur,
  then the problem is not on the HP3k.
 
  If there are re-transmissions and the events timing in linktrace
  correlates with screen painting timing, that means network or PC
  side problems.
 
  If there are no retransmissions, but the original sends are delayed
  and timing matches with the PC screen painting, there's something
  wrong with the hp3k software or hardware...   (traces, traces, traces !!!!).
 
...whatever this is worth,
Cheers,
:-) Eero - HP CSY Networking lab.