On Mon, Nov 30, 2009 at 10:19:37AM +0100, Thomas Backman wrote: > > I'm just wondering what's wrong with FreeBSD 8.0/amd64 when I read the > > Benchmarks on Phoronix.org's website. Especially FreeBSD's threaded I/O > > shows in contrast to all claims that have been to be improoved the opposite. > Corrected link: > http://www.phoronix.com/scan.php?page=article&item=freebsd8_benchmarks&num=1 > > And yeah, quite honestly: disk scheduling in FreeBSD appears to suck... The > only reason I'm not switching from Linux. :( > > Regards, > Thomas > > (PS. See my thread about horrible console latency during disk IO in the > archives, very related. DS.)_______________________________________________
Given this is a discussion predominantly with disk I/O and/or filesystem "stuff", possibly the discussion should be on -fs instead? I do see the reasoning behind discussing it on -stable though. I haven't looked at the Phoronix Test Suite[1], which is what's being used for testing "threaded I/O". I don't understand what "threaded I/O" means in this context; I'm assuming it means making a separate LWP for each I/O transaction, e.g. multiple LWPs for I/O (within a single program). Some technical details of the implementation/test methodology would need to be provided for someone to assist in tracking down the problem. However, I will take the time to point out one key piece of info: The Phoronix Test Suite appears to be written entirely in PHP[2]. I've looked at the source and it does appear to be PHP-based (with reliance on numerous third-party C-based libraries, of course; this is normal). Given that, I'm not sure I can really take the results of some of those tests seriously. I'm not dissuading the evidence, I'm just saying, it's more of a "PHP benchmark on <OS>" than it is an OS benchmark. [1]: http://www.phoronix-test-suite.com/ [2]: http://www.phoronix-test-suite.com/?k=downloads -- | Jeremy Chadwick [email protected] | | Parodius Networking http://www.parodius.com/ | | UNIX Systems Administrator Mountain View, CA, USA | | Making life hard for others since 1977. PGP: 4BD6C0CB | _______________________________________________ [email protected] mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-stable To unsubscribe, send any mail to "[email protected]"
