November 2003
Intermediate to advanced
212 pages
6h 37m
English
book
S/390 PartnerWorld for Developers, ITSO/EFS Project EFS Systems on a Linux Base: Additional Topics
by Bill Ogden, Michael Ryan
Content preview from S/390 PartnerWorld for Developers, ITSO/EFS Project EFS Systems on a Linux Base: Additional Topics
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Chapter 2. Tuning considerations 23
product. The instruction cache requires an average of 11 bytes for each S/390 instruction byte
cached. A S/390 LA instruction, for example, requires 44 bytes in the cache.
You can monitor the effectiveness of the instruction cache with the d cachestats command:
flexes> d cachestats
Cache hits: 20465153/212253141 96%
Cache misses: 760188/212253141 4% <== monitor this number
...
The number of cache misses in this report is the critical information. If this number is above
about 4 percent, you should increase your cachesize parameter. (But never increase it to the
point where Linux starts paging!) If the number is considerably less than 4 percent, you
might make better use of your server memory by increasing ...
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