I can concur on this. I also called IBM TSM on zOS support, back a while 
ago, about performance issues.

He told me the default "maxquick" value is 4% of allocated/available 
REGION.  For us, we bumped it to 20M.  He also said there is a usermod 
that will "zap" TSM to make it default to 10% (or something like that) !




Stefan Holzwarth <stefan.holzwarth AT ADAC DOT DE> 
Sent by: "ADSM: Dist Stor Manager" <ADSM-L AT VM.MARIST DOT EDU>
04/27/2004 03:09 AM
Please respond to
"ADSM: Dist Stor Manager" <ADSM-L AT VM.MARIST DOT EDU>


To
ADSM-L AT VM.MARIST DOT EDU
cc

Subject
Internal Memory Managment TSM @MVS






Hi,

3 month ago i read about PMR92547, that describes performance-problems
coming from a too small internal memorypool
Since we had speedproblems we doubled that pool size and after 3 month i
believe it was a good step forward.

With show memu you can have a look at the current settings (should be done
after some uptime)

    MAX initial storage  1073741824  (1024.0 MB)
    Freeheld bytes 45106900  (43.0 MB)                  <- this is needed 
by
the TSM Server
    MaxQuickFree bytes 52682955  (50.2 MB)        <- this should be always
greater than freeheld
    51 Page buffers of 25724 : 194 buffers of 3215.
    26 Large buffers of 1607 : 153 XLarge buffers of 200.
   186666 buffers free: 257114 hiAlloc buffers: 70448 current buffers.
   144822 units of 56 bytes hiAlloc: 58024 units of 56 bytes hiCur.
  0000001 blocks, total 0002672, lgst 0002672 avg 0002672  by ¨0Cf?+
Ñ+80000E08.
  0000001 blocks, total 0000136, lgst 0000136 avg 0000136  by ¨0Cf?+
Ñ+80000080.
  0000001 blocks, total 0006652, lgst 0006652 avg 0006652  by ¨0Cf?+
Ñ+80000078.
  0000007 blocks, total 0001232, lgst 0000176 avg 0000176  by ¨0Cf?+
Ñ+80000062.
  0000669 blocks, total 0065147, lgst 0000285 avg 0000097  by ¨0Cf?+
Ñ+800009DE.


with "Show Memu SET MAXQUICK  52682955" set the     MaxQuickFree to about
50M


All at your own risk!

Kind regards,
Stefan Holzwarth

----------------------------------------------------------------------------
--
Stefan Holzwarth
ADAC e.V. (Informationsverarbeitung - Systemtechnik - Basisdienste)
Am Westpark 8, 81373 München, Tel.: (089) 7676-5212, Fax: (089) 76768924
mailto:stefan.holzwarth AT adac DOT de