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From: KHF@JHUIGF.BITNET.UUCP
Newsgroups: comp.os.vms
Subject: System buffer unavailable from DECNET
Message-ID: <8710052221.AA23415@ucbvax.Berkeley.EDU>
Date: Mon, 5-Oct-87 15:08:00 EDT
Article-I.D.: ucbvax.8710052221.AA23415
Posted: Mon Oct  5 15:08:00 1987
Date-Received: Sat, 10-Oct-87 13:36:05 EDT
Sender: daemon@ucbvax.BERKELEY.EDU
Distribution: world
Organization: The ARPA Internet
Lines: 34

Hi gang:

   We're having a DECnet problem that has finally driven me around the bend.
We've got a pair of uVAX II's running uVMS 4.5/DECnet 4.5 (full routing).
One has 5 MB, the other 9 MB.  On each machine, we are receiving what I
consider to be an unusual number of SYSTEM BUFFER UNAVAILABLE counts from
NCP SHOW LINE QNA-0 COUNTER --- 50 or more events PER HOUR!!! The NCP manual
explains the message as:

        "This counter indicates the total number of times no system buffer was
available for an incoming frame.  This can be any buffer between the hardware
and the user buffers (those supplied on receive requests)."

        Pretty useful message, eh?  Swapping DEQNA boards, changing the number
of receive buffers (SET LINE QNA-0 RECEIVE BUFFERS) from 6 to 12 each had no
effect.  MONITOR POOL indicates that we are not running out of LRP's (or SRP's
and IRP's for that matter).

        What's going on here?  Any ideas?  I should also add that these
machines are on an Ethernet cable with a large number of systems running TCP/IP
and XNS.  Could that enter into it?  Any help at all would be GREATLY
appreciated.
-------------------------------------------------------------------------------
Ken Fasman

        U.S. Mail: Bard Laboratories of Neurophysiology
                   Johns Hopkins School of Medicine
                   725 N. Wolfe St.
                   Baltimore MD  21205
        Telephone: (301) 955-8330
        BITNET:    KHF@JHUIGF

"My opinions, especially the wrong ones, are strictly my own."
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