Date: Sun, 08 Oct 2006 21:05:06 +0200 From: "O. Hartmann" <ohartman@mail.uni-mainz.de> To: Ceri Davies <ceri@submonkey.net>, freebsd-bugs@FreeBSD.org Subject: Re: kern/85820: 1.5 times slower performance with SCHED_ULE than SCHED_4BSD Message-ID: <45294BE2.2010007@mail.uni-mainz.de> In-Reply-To: <20061008175901.GW21333@submonkey.net> References: <200610081720.k98HKkQx058984@freefall.freebsd.org> <45293AAD.9090205@mail.uni-mainz.de> <20061008175901.GW21333@submonkey.net>
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Ceri Davies wrote: > On Sun, Oct 08, 2006 at 07:51:41PM +0200, O. Hartmann wrote: > >> Ceri Davies wrote: >> >>> Synopsis: 1.5 times slower performance with SCHED_ULE than SCHED_4BSD >>> >>> State-Changed-From-To: open->closed >>> State-Changed-By: ceri >>> State-Changed-When: Sun Oct 8 17:19:36 UTC 2006 >>> State-Changed-Why: >>> ULE is no longer the default scheduler, and no longer has a maintainer. >>> This is an interesting test case though. >>> >>> >>> Responsible-Changed-From-To: freebsd-amd64->freebsd-bugs >>> Responsible-Changed-By: ceri >>> Responsible-Changed-When: Sun Oct 8 17:19:36 UTC 2006 >>> Responsible-Changed-Why: >>> Scheduler problem. >>> >>> http://www.freebsd.org/cgi/query-pr.cgi?pr=85820 >>> _______________________________________________ >>> freebsd-amd64@freebsd.org mailing list >>> http://lists.freebsd.org/mailman/listinfo/freebsd-amd64 >>> To unsubscribe, send any mail to "freebsd-amd64-unsubscribe@freebsd.org" >>> >>> >> Very interesting to read. And this is now the end of the newly >> introduced allround weapon for more scalability? >> > > There is some one working on SCHED_ULE, but they are not a committer and > they suggested that this PR could be closed. It contains an interesting > test case but no real problem as such, only that one scheduler is slower > that the other for certain loads. That is always going to be true. > > Ceri > Sorry for my smug comment. Today I was searching the web for scaleability benchmarks on the different flavors of BSD and Linux and I read very much about the great benefits of ULE, and it is really interesting to read about ULE what has been written in 2004 and January 2005. Well, today I exchanged SCHED_ULE in my kernel config back to SCHED_4BSD on my UP FreeBSD 6.2-PRE/AMD64 box and on normal desktop usage I experience a significant performance impact (Firefox/Thunderbird react both much smoother). Tomorrow I will change the same on my lab's i386 box (also UP) and see, whether some calculations also will run faster. Well, I'm not the benchmark crack anyhow and as I knew SCHED_ULE was the defualt for 6.1 and it was said that even UP systems also benefit from the improvements. At this point, I see that there is a great need in work to be done. Regards, Oliver
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