Date: Thu, 15 Dec 2011 15:58:44 +0200 From: Daniel Kalchev <daniel@digsys.bg> To: Jeremy Chadwick <freebsd@jdc.parodius.com> Cc: Adrian Chadd <adrian@freebsd.org>, "Samuel J. Greear" <sjg@evilcode.net>, Current FreeBSD <freebsd-current@freebsd.org>, FreeBSD Stable Mailing List <freebsd-stable@freebsd.org>, freebsd-performance@freebsd.org, "O. Hartmann" <ohartman@zedat.fu-berlin.de> Subject: Re: Benchmark (Phoronix): FreeBSD 9.0-RC2 vs. Oracle Linux 6.1 Server Message-ID: <0C72D682-CF5E-42D6-91F3-FEF1AB02F5D6@digsys.bg> In-Reply-To: <20111215134853.GA24753@icarus.home.lan> References: <CAJ-FndDniGH8QoT=kUxOQ%2BzdVhWF0Z0NKLU0PGS-Gt=BK6noWw@mail.gmail.com> <4EE2AE64.9060802@m5p.com> <4EE88343.2050302@m5p.com> <CAFHbX1%2B5PttyZuNnYot8emTn_AWkABdJCvnpo5rcRxVXj0ypJA@mail.gmail.com> <4EE933C6.4020209@zedat.fu-berlin.de> <CAPjTQNEJDE17TLH-mDrG_-_Qa9R5N3mSeXSYYWtqz_DFidzYQw@mail.gmail.com> <20111215024249.GA13557@icarus.home.lan> <4EE9A2A0.80607@zedat.fu-berlin.de> <CAJ-VmomWnAvsVPcK0mfFECvFw_FKcja1m3NE9ue=TOkF%2Bx14Xg@mail.gmail.com> <CANY-Wm8jbtr3tiwdGQMDx8SVZKEBspGwTV7Q0wziYWsV%2Bf3BSQ@mail.gmail.com> <20111215134853.GA24753@icarus.home.lan>
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On Dec 15, 2011, at 3:48 PM, Jeremy Chadwick wrote: [=85] > That said: thrown out, data ignored, done. >=20 > Now what? Where are we? We're right back where we were a day or two > ago; meaning no closer to solving the dilemma reported by users and > SCHED_ULE. Heck, we're not even sure if there is an issue, other than > some folks confirming that SCHED_4BSD performs better for them (that's > what started this whole thread), and there are at least a couple which > have stated this. But, are any of these benchmarks really engaging the 4BSD/ULE scheduler = differences? Most such benchmarks are run on a system with no other load = whatsoever and in no way represent real world experience. What is more, I believe in such benchmarks "the system feels sluggish" = is not measured at all. Even if it is measured, if in such case the = benchmark finishes "better" - that is, faster, or say, makes the system = freeze for the user for the duration of the test -- it will be = considered "win", because the benchmark suite ran faster on that = particular system -- whereas a system which ran the benchmark fast, = provided good interactive response etc would be considered "loser". I think it is not good idea to hijack this thread, but instead focusing = on the other SCHED_ULE bashing thread to define an reasonable benchmark = or a set of benchmarks rather -- so that many would run it and provide = feedback. Daniel=
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