SUMMARY: What happens when shmmax is set above MAXINT on 2.6?
2007-12-25 0:25:00
reminding me of some simple arithmetic.
My question (paraphrased):
My group has an E6500 server running Solaris 2.6 with the shmmax kernel
parameter set to 6 GB. The system boots and is running just fine; however,
sysdef reports that shmmax is set to 2GB. I wanted to know if this would /
could cause problems other than performance degradation, and I also was
curious as to how the OS arrived at 2GB.
Basic answers:
Shouldn't be an issue with the system (and we'll fix it next time we get a
chance). With regards to the 2 GB value, the system apparently chopped off
the high-order bit. 6 GB = 2^32 + 2^31, after shifting the high-order bit
you get 2^31 = 2 GB. I knew I was missing something simple.
Thanks once again!
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Allen Cain MP 5H - C
System Administrator
IS / Application Server Engineering
Tennessee Valley Authority
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