bumped to 1024*1024=1MB in /usr/src/sys/sys/param.h and recompiled kernel.
all test performed on filesystem on which right newfs options were used so
FFS were able to use it.
effects:
single process - almost no gain, bonnie++ showed about 5% worse speeds on
linear read and linear write, about 2% better at rewrite, same with seek.
multiple process and heavy disk load - HUGE gain. copying large files does
not slow down so much when doing
find / >/dev/null
in the same time, multiple large file operations performs smooth, much
less seeks etc.
i will keep this setting.
tried to manipulate with vfs.{hi,lo}runningspace - defaults are OK, where
hirunningspace=1MB=MAXPHYS. after enlarging performance was not better,
while delays (average service time) much worse. so defaults are OK.
settings more than 1MB probably doesn't make sense.
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