Date: Thu, 24 Jan 2008 02:58:56 +0100 From: Kris Kennaway <kris@FreeBSD.org> To: Kris Kennaway <kris@FreeBSD.org> Cc: "freebsd-performance@freebsd.org" <freebsd-performance@freebsd.org>, Erik Cederstrand <erik@cederstrand.dk> Subject: Re: Performance Tracker project update Message-ID: <4797F0E0.8050201@FreeBSD.org> In-Reply-To: <47979153.8090100@FreeBSD.org> References: <4796C717.9000507@cederstrand.dk> <47972895.4050005@FreeBSD.org> <479745DA.8010003@cederstrand.dk> <47979153.8090100@FreeBSD.org>
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Kris Kennaway wrote:
>>> P.S. If I understand correctly, the float test shows a regression?
>>> 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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