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Message-ID: <alpine.DEB.2.00.0909251501310.13144@sebohet.brgvxre.pu> Date: Fri, 25 Sep 2009 16:46:34 +0200 (CEST) From: Tobias Oetiker <tobi@...iker.ch> To: Corrado Zoccolo <czoccolo@...il.com> cc: Shan Wei <shanwei@...fujitsu.com>, Jens Axboe <jens.axboe@...cle.com>, Jeff Moyer <jmoyer@...hat.com>, linux-kernel@...r.kernel.org Subject: Re: [Fwd: [RFC] cfq: adapt slice to number of processes doing I/O (v2.1)] Hi Corrado, > > Have you tested buffered write, multi-threads? > Yes. One interesting test was done by Tobias Oetiker > (http://oss.oetiker.ch/optools/wiki/fsopbench) on his Areca HW Raid6 > with ext3. He put target_latency to 200ms, and used a lower > slice_idle, to match his faster disks. I have since updated my benchmark program: http://oss.oetiker.ch/optools/wiki/FsOpBench it provides an even better competition model. It now works on a 20GB artificial file tree with a home directory like file distribution. Results are quite striking ... (not necessarily encouraging). results are quite amazing ... I am still collecting ... but maybe some of you want to try this too ... cheers tobi -- Tobi Oetiker, OETIKER+PARTNER AG, Aarweg 15 CH-4600 Olten, Switzerland http://it.oetiker.ch tobi@...iker.ch ++41 62 775 9902 / sb: -9900 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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