Date: Mon, 30 Nov 2009 01:43:15 -0800 From: Jeremy Chadwick <freebsd@jdc.parodius.com> To: freebsd-stable@freebsd.org Subject: Re: Phoronix Benchmarks: Waht's wrong with FreeBSD 8.0? Message-ID: <20091130094315.GA94119@icarus.home.lan> In-Reply-To: <0D3A9408-84A8-4C74-A318-F580B41FC1A6@exscape.org> References: <4B13869D.1080907@zedat.fu-berlin.de> <0D3A9408-84A8-4C74-A318-F580B41FC1A6@exscape.org>
next in thread | previous in thread | raw e-mail | index | archive | help
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 jdc@parodius.com | | Parodius Networking http://www.parodius.com/ | | UNIX Systems Administrator Mountain View, CA, USA | | Making life hard for others since 1977. PGP: 4BD6C0CB |
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?20091130094315.GA94119>