Date: Sat, 17 Dec 2011 13:20:45 -0800 From: Adrian Chadd <adrian@freebsd.org> To: Andriy Gapon <avg@freebsd.org> Cc: George Mitchell <george+freebsd@m5p.com>, freebsd-stable@freebsd.org, Oliver Pinter <oliver.pntr@gmail.com> Subject: Re: SCHED_ULE should not be the default Message-ID: <CAJ-VmokoexQdgcWsW5ufGHCdQ-nzdPcjgYyftA52eSNGcurpfw@mail.gmail.com> In-Reply-To: <4EED05EC.8050103@FreeBSD.org> References: <4EE1EAFE.3070408@m5p.com> <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> <4EECD261.2080208@m5p.com> <4EED05EC.8050103@FreeBSD.org>
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Erm, just as a random question - since device drivers (and GEOM) run as separate threads, has anyone looked into what kind of effects the scheduler has on these? I definitely have measurable throughput/responsiveness differences between ULE and 4BSD (and preempt/non-preempt on 4BSD) on my MIPS boards when they're bridging traffic. I wonder if there's something strange going on with the scheduling and preemption of driver netisrs, taskqueues, the fast interrupt handlers, etc. This may -not- be a userland specific problem.. Adrian
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