Conference noted::pwv50ift

4314.0. "UCX performance killer for pathworks" by DUNKLE::MCDERMOTT (OpenVMS: "To affinity and beyond!") Mon Jun 02 1997 12:17

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Note 57.0             UCX performance killer for pathworks            No replies
UTRTSC::BAKKER "Running arround in circles"          74 lines  28-MAY-1997 15:04
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    Hi,            
    
    We have seen a real performance killer.
    When a customer uses UCX as transport for pathworks and reports a very
    slow network please read on:
    
    When you look at the server you don't see any server activity.
    So there is no reason why this system is slow. Issue the following
    command:
    
    $ UCX
    UCX> SHOW COMMUNICATION
    Communication Parameters
    
    Local host:      utruin                 Domain:   uto.dec.com
    
    Cluster timer:             5
                                     Maximum     Current        Peak
    Interfaces                            20           3           3
    Device_sockets                       300          51          53
    Routes                             65535         477         481
    Services                             200          20          20
    Proxies                               60
    
    Type:        FDDI       Free     Maximum   Max Bytes     Minimum MinBytes
    Large buffers             20          70      331520          10   47360
    Small buffers            150        1000      256000          50   12800
    IRPs                      20         200
    Non UCX buffers           10
    
    Remote Terminal
      Large buffers:          10
      UCBs:                    4
      Virtual term:     disabled
    
    This screen tells yo the maximum buffer sizes in this case for large buffer
    70 and for small buffers this is 1000.
    
    Now issue the following command:
    
    UCX> SHOW COMMUNICATION /MEMORY
    
                                       MBUF Summary
                        Small_static Large_static Small_dynamic Large_dynamic
     Total buffers           50            10            600          0
     Free                     0             9             37          0
     Busy
     Data                     0             1              0          0
     Header                   0             0             30          0
     Socket                   8             0             45          0
     Prot. control            7             0             40          0
     Route                   29             0            448          0
     Socket name              0             0              0          0
     Socket options           0             0              0          0
     Fragment reassembly      0             0              0          0
     IP address               3             0              0          0
     Size of cluster      13056         47616          26368          0
    
               Free       Current          Peak          Waits       Drops
     Small Buffers            613           615              0          0
     Large Buffers              1             9              0          0
     IRPs         1            40            41              0          0
    
                        Small clusters  Large clusters    Non UCX buffers
     Free                            0             0              0
    
    Now watch the peak values: If they are equal to the maximum values from
    the command before you are in trouble. You have to increase the values!
    
    You can do that on the fly. Don't forget to modify the permanent
    values!
    
    regards,
    	Paul Bakker