SPECweb96 Tuning Disclosure: For IBM 390
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MAXFILEPROC
    Specifies the maximum number of files that a single process can have
    concurrently active or allocated. MAXFILEPROC is the same as the
    OPEN_MAX variable in the POSIX standard.

    Value Range: a decimal value from 3 to 65535.  Default is 64.


MAXPROCSYS
    Specifies the maximum number of OpenEdition processes that the system
    allows.

    Value Range: a decimal value from 5 to 32767. Default is 200.


MAXPROCUSER
    Specifies the maximum number of processes that a single OpenEdition
    user ID can have concurrently active, regardless of how the processes
    were created.  MAXPROCUSER is the same as the CHILD_MAX variable in
    the POSIX standard.

    Value Range: a decimal value from 3 to 32767.  Default is 25.


MAXTHREADTASKS
    Specifies the maximum number of MVS tasks that a single process c= an
    have concurrently active for pthread_created threads.

    Value Range: nnnnn is a decimal value from 0 to 32768.  Default is 50.


MAXASSIZE
    Specifies the RLIMIT_AS resource values that a process receives when
    it is identified as a process. RLIMIT_AS indicates the address space
    region size.  

    Value Range: a decimal value from 10485760 (10 megabytes) to
		2147483647 (2 gigabytes).  Default is 41943040 (40 megabytes)


MAXMMAPAREA
    Specifies the maximum amount of data space storage space (in pages)
    that can be allocated for memory mappings of HFS files. Storage is not
    allocated until the memory mapping is active.

    Value Range: a decimal value from 1 to 16777216.  Default is 4096.


MAXTHREADS
    Specifies the maximum number of pthread_created threads, including
    running, queued, and exited but undetached, that a single process can
    have concurrently active. Specifying a value of 0 prevents
    applications from using pthread_create.

    Value Range: a decimal value from 0 to 100000.  Default is
    200.


MAXUIDS
     Specifies the maximum number of OpenEdition user IDs (UIDs) that can
     operate concurrently.

     Value Range: a decimal value from 1 to 32767.  Default is 200.


MAXSOCKETS
    Is the maximum number of sockets supported by this file system.  You
    can specify a value from 0 to 64498. This is an optional parameter.
    The maximum value that this field can have is defined by each domain.
    If a value larger than the maximum is specified, an informational
    message is issued and the value used is the maximum. If this parameter
    is omitted, a default value of 100 is used.


FIXED MAX(maxfixK|M)
ECSA MAX(maxecsaK|M)
    These lines in the CSM parmlib member define the maximum amount of
    storage to be dedicated to fixed and ECSA buffers in CSM.   CSM is the
    storage management component of the S/390 TCP/IP implementation.

    maxfix A decimal integer specifying the maximum bytes of fixed storage
    to be dedicated for use by CSM. The range is from 1024K to 2048M. The
    default is 100M.

    maxecsa A decimal integer specifying the maximum bytes of ECSA storage
    to be dedicated for use by CSM. The range is from 1024K to 2048M. The
    default is 10M.


MAXREADS
    specifies how many read buffers are available to read data over a high
    performance data transfer (HPDT) MPC connection.

    range: 4-8.  Default is 4.


MAXBFRU
    Specifies the number of 4K buffer pages VTAM uses to receive data when
    activating a multipath channel. The same MAXBFRU value is used for
    each of the READ subchannels. The resulting buffer size is
    number_of_pages multiplied by 4K. The total buffer space used is 4K
    multiplied by number_of_pages multiplied by the number of READ
    subchannels.

    range:          1-16

    MAXBFRU defaults to 1 when HPR=NO, XID=NO, CONNTYPE=LEN, or the VTAM
    node is not HPR capable.  MAXBFRU defaults to 5 when HPR=YES, XID=YES,
    CONNTYPE=APPN, or the VTAM node is HPR capable.


SOMAXCONN
    The maximum number of pending connection requests queued for any
    listening socket. 
    
    Value Range: 1-Unlimited.  The default is 10.


TCPSENDBFRSIZE
    TCP send buffer size between 256 and 256K. The default is 16384 (16K).
    This value will be used as the default send buffer size for those
    applications which do not explicitly set the buffer size via
    SETSOCKOPT().


TCPRCVBUFRSIZE
    TCP receive buffer size between 256 and TCPMAXRCVBUFRSIZE. The default
    is 16384 (16K). This value will be used as the default receive buffer
    size for those applications which do not explicitly set the buffer
    size via SETSOCKOPT().


EnableFRCA      
    Enables the integrated cache support

    Values: on or off, default off


FRCAMaxFileSize
    The maximum size of the file that will be cached by the integrated cache

    Values: 1-Max file size (>2G).  Default is 1M.

FRCACacheEntries
    The maximum number of files that can be cached by the integrated cache

    Values: 1-Unlimited.  Default is 100.