Vijay Adik vadik@us - IBM
Vijay Adik vadik@us - IBM
Vijay Adik vadik@us - IBM
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14<br />
<strong>IBM</strong> Advanced Technical Support - Americas<br />
VMM Tuning<br />
Definitions:<br />
� LRUD= VMM page stealing process (LRU Daemon) – 1 per Memory Pool<br />
� numperm, numclient = used fs buffer cache pages, seen in ‘vmstat –v’<br />
� minperm = target minimum number of pages for fs buffer cache<br />
� maxperm, maxclient = target maximum number of pages for fs buffer cache<br />
Parameters:<br />
� MINPERM% = target min % real memory for fs buffer cache<br />
� MAXPERM%, MAXCLIENT% = target max % real memory for fs buffer cache<br />
� MINFREE = target minimum number of free memory pages<br />
� MAXFREE = target maximum number of free memory pages<br />
When does LRUD start?<br />
� When total free pages (in a given memory pool) < MINFREE<br />
� When (maxclient pages - numclient) < MINFREE<br />
When does LRUD stop?<br />
� When total free pages > MAXFREE<br />
� When (maxclient pages – numclient) > MAXFREE<br />
© 2009 <strong>IBM</strong> Corporation<br />
April 17, 2009
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