[K42-discussion] control flags for ReAIM benchmark

[Andrew Baumann]

Hi all,

I'm trying to determine the "best" set of kernel control flags to use for the 
ReAIM benchmark. The workload is quite configurable, but generally it seems 
to be a fork-intensive benchmark intended to measure system throughput for a 
multiuser workload, doing various kinds of IPC and operations on small files.

I've experimentally determined that control flags 0x01ef seem to return the 
best results. This corresponds to:
#    bit  0 [0x0000000000000001] (RUN_SILENT)			ON
#    bit  1 [0x0000000000000002] (DISABLE_IO_CPU_MIGRATION)	ON
#    bit  2 [0x0000000000000004] (SLOW_THINWIRE_POLLING)	ON 
#    bit  3 [0x0000000000000008] (UID_PROCESSOR_ASSIGNMENT)	ON
#    bit  4 [0x0000000000000010] (DYN_PROCESSOR_ASSIGNMENT)	OFF
#    bit  5 [0x0000000000000020] (PAGING_OFF)			ON
#    bit  6 [0x0000000000000040] (NON_SHARING_FILE_OPT)		ON
#    bit  7 [0x0000000000000080] (USE_MULTI_REP_FCMS)		ON
#    bit  8 [0x0000000000000100] (NO_ALLOC_SANITY_CHECK)	ON
#    bit  9 [0x0000000000000200] (SMALL_FILE_OPT)		OFF
#    bit 10 [0x0000000000000400] (DBG_FLAG)			OFF
#    bit 11 [0x0000000000000800] (SLOW_EXEC)			OFF

... since I'm not familiar with the exact meaning of these flags, I wanted to 
check whether that configuration seems sane. Can anyone explain what the 
SMALL_FILE_OPT and UID/DYN_PROCESSOR_ASSIGNMENT flags do?

Cheers,
Andrew
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