Kris Kennaway wrote:
>>> P.S. If I understand correctly, the float test shows a regression?

quoted text
>>> The metric is calculations/second, so higher = better?

>>

>> The documentation on Unixbench is scarce, but I would think so.

>

> Interesting.  Some candidate changes from 2007-10-02:

>

>   Modified files:

>     contrib/gcc          opts.c

>   Log:

>   Do not imply -ftree-vrp with -O2 and above.  One must implicitly specify

>   '-ftree-vrp' if one wants it.

>   Some bad code generation has been tracked to -ftree-vrp.  jdk1{5,6} are

>   notable examples.

OK, so it was this one.  The other interesting events seem to be:
2007-10-20: drop in super-smack performance and context switch

benchmarks.  This is due to the switch from SCHED_4BSD to SCHED_ULE

(super-smack is largely a context switch benchmark due to retarded

design).  There are uncommitted patches that reduce ULE context switch

overhead though, so it will be interesting to see how they affect this.
2007-12-30: file read/pipe read/pipe ping-pong/syscall overhead

performance increases.  This is due to Jeff's lockless struct file

changes (syscall overhead is only affected because unixbench uses the

dup2() syscall which is not in fact just a measure of syscall overhead

but now has reduced non-syscall cost).
Kris

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