Date: Sun, 13 Jul 2008 12:30:34 -0700 From: "Garrett Cooper" <yanefbsd@gmail.com> To: "Eugene Grosbein" <eugen@kuzbass.ru> Cc: Nate Eldredge <neldredge@math.ucsd.edu>, freebsd-hackers@freebsd.org Subject: Re: SCHED_4BSD bad interactivity on 7.0 vs 6.3 Message-ID: <7d6fde3d0807131230m598cf198ia1deded3afa1ac0c@mail.gmail.com> In-Reply-To: <20080713074730.GA93887@svzserv.kemerovo.su> References: <Pine.GSO.4.64.0807121125300.20326@zeno.ucsd.edu> <4879563B.5090201@FreeBSD.org> <20080713074730.GA93887@svzserv.kemerovo.su>
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On Sun, Jul 13, 2008 at 12:47 AM, Eugene Grosbein <eugen@kuzbass.ru> wrote: > On Sun, Jul 13, 2008 at 03:11:23AM +0200, Kris Kennaway wrote: > >> >It seems like there has been a regression in interactivity from >> >6.3-RELEASE to 7.0-RELEASE when using the SCHED_4BSD scheduler. After >> >upgrading my single-cpu amd64 box, 7.0 has much worse latency. When >> >running a kernel compile, there is a noticeable lag to echo my typing or >> >scroll my browser windows, and playing an mp3 frequently cuts out for a >> >second or two. This did not happen on 6.3-RELEASE. >> >> Are you sure it's not the x.org server bug that was present in the >> version shipped with 7.0? > > No, it's not. I have exactly the same problem with SCHED_4BSD > after upgrade from 6.3-STABLE to 7.0-STABLE. I didn't upgrade > my x.org 6.9.0, only OS (all 6.x compat shims are installed). > There is some sort of regression, certainly. IIRC some folks reported performance degradation using SCHED_4BSD in the past after the SMP fixes, so this isn't a new news story. SCHED_ULE isn't going to be default until 7.1-RELEASE I believe because they might be fanning out a few bugs in -CURRENT (the number of bugs are small from what I've seen) and MFC'ing them to 7-RELEASE. -Garrett
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