Date: Thu, 4 Feb 2010 15:20:45 +0100 From: Luigi Rizzo <rizzo@iet.unipi.it> To: Bruce Simpson <bms@incunabulum.net> Cc: freebsd-stable@freebsd.org Subject: Re: ionice in FreeBSD? Message-ID: <20100204142045.GA86101@onelab2.iet.unipi.it> In-Reply-To: <4B6ACC38.2030708@incunabulum.net> References: <4B685EBA.4020501@minibofh.org> <4B695A1A.1000505@incunabulum.net> <4B696360.3070209@minibofh.org> <4B6ACC38.2030708@incunabulum.net>
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On Thu, Feb 04, 2010 at 01:31:36PM +0000, Bruce Simpson wrote: > On 02/03/10 11:52, Jordi Espasa Clofent wrote: > > > >>So I guess my question is, 'why do you need I/O scheduling, and what > >>aspect of system performance are you trying to solve with it' ? ... > There have been previous research forks of FreeBSD to implement I/O > scheduling; Eclipse/BSD from Bell Labs was one of them. It might be a > good Google Summer of Code project for an interested computer science > student. there is actually some good and current code at http://info.iet.unipi.it/~luigi/FreeBSD/ http://info.iet.unipi.it/~luigi/FreeBSD/geom_sched-20090307.tgz hopefully should still be working on RELENG_7 as long as you refrain from removing the scheduler from a live mounted fs. I used it on RELENG_7, with minor changes should work on R8/HEAD, and I hope to come up with updated versions by the end of the month when i am done with the dummynet rewrite. cheers luigi
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