Date: Sat, 25 Oct 2003 01:01:08 +0200 From: "Devon H. O'Dell" <dodell@sitetronics.com> To: Felix von Leitner <felix-benchmark@fefe.de>, freebsd-performance@freebsd.org Subject: Re: Please help me tune FreeBSD for bulk.fefe.de/scalability/ Message-ID: <3F99AF34.2050805@sitetronics.com> In-Reply-To: <20031024142345.GA9997@codeblau.de> References: <20031024142345.GA9997@codeblau.de>
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Felix von Leitner wrote: >Hi! > >Several people have asked me to re-run my benchmarks after the kernels >have been properly tuned. > Hey Felix, To be totally fair, I'd like to point out the messages from freebsd-hackers that were sent earlier today: On Fri, 24 Oct 2003, Michel TALON wrote: >> What is more interesting is to look at the actual benchmark results in >> http://bulk.fefe.de/scalability/ >> in particular the section about mmap benchmarks, the only one where >> OpenBSD shines. However as soon as touching pages is benchmarked >> OpenBSD fails very much. > > look closer. openbsd's "touch page" times are identical to what you'd expect a disk access to be. the pages aren't cached, they're read from disk. so compared to systems that don't read from disk, it looks pretty bad. a 5 line patch to fix the benchmark so that the file actually is cached on openbsd results in performance much in line with freebsd/linux. The above is a reply by Ted Unangst; perhaps you'd like to look into this. --Devon
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