Date: Fri, 16 Dec 2011 13:39:01 -0800 From: Doug Barton <dougb@FreeBSD.org> To: Adrian Chadd <adrian@freebsd.org> Cc: Tom Evans <tevans.uk@googlemail.com>, "C. P. Ghost" <cpghost@cordula.ws>, Luigi Rizzo <rizzo@iet.unipi.it>, Jeremy Chadwick <freebsd@jdc.parodius.com>, freebsd-stable@freebsd.org Subject: Re: switching schedulers (Re: SCHED_ULE should not be the default) Message-ID: <4EEBBA75.2090508@FreeBSD.org> In-Reply-To: <CAJ-VmonTZK-Ky8d1yh7yOuFT3kDvtYsO%2BAwQOpZHM-g0JNJScQ@mail.gmail.com> 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> <20111215004205.GA11556@icarus.home.lan> <CAFHbX1KdsvKBPvpxQG-dL1szxk4FB86WxQF-Cw1PWLf=7pQg7w@mail.gmail.com> <CADGWnjU9Sp6DoGCVQ6X_CNwcgQUDW9YviNr6eENAQmptAmX_wQ@mail.gmail.com> <20111216081145.GA76297@onelab2.iet.unipi.it> <4EEB218B.1090209@freebsd.org> <20111216152409.GA79938@onelab2.iet.unipi.it> <CAJ-VmonTZK-Ky8d1yh7yOuFT3kDvtYsO%2BAwQOpZHM-g0JNJScQ@mail.gmail.com>
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On 12/16/2011 12:53, Adrian Chadd wrote: > Hi all, > > Can someone load a kernel module dynamically at boot-time? > > Ie, instead of compiling it in, can 4bsd/ule be loaded as a KLD at > boot-time, so the user can just change by rebooting? > > That may be an acceptable solution for now. That, or a loader.conf tunable (which in the case of making them modules would basically amount to the same thing, right?). I've heard several really smart people with rather convincing explanations of why ULE is not the right choice for default for 2 cores or less. If we could ship one kernel with both schedulers available it should be simple to modify the installer to choose the right one and put the right stuff in loader.conf. Doug -- [^L] Breadth of IT experience, and depth of knowledge in the DNS. Yours for the right price. :) http://SupersetSolutions.com/
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