Date: Wed, 17 Oct 2001 12:15:52 -0600 From: Brett Glass <brett@lariat.org> To: Dag-Erling Smorgrav <des@ofug.org>, chat@FreeBSD.ORG Subject: Re: Breaking news: FreeBSD is "considering implementing a preemptible kernel" Message-ID: <4.3.2.7.2.20011017120858.046a58a0@localhost> In-Reply-To: <xzpwv1vwq2t.fsf@flood.ping.uio.no>
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At 09:40 AM 10/16/2001, Dag-Erling Smorgrav wrote: >Robert Love is writing a patch to make the Linux kernel preemptible, >and has some interesting ideas about FreeBSD: > >http://kerneltrap.com/article.php?sid=328&mode=thread&order=0 Kernel pre-emption is tough to retrofit into a kernel, but not hard to put in if you're writing one from scratch. SVS' "Integrity" (http://www.ghs.com/products/rtos/integrity.html) has had it for quite some time. The RTOS never turns off interrupts, though it does ignore those that come in while a previous interrupt from the same source is being handled. As for SMP: It's probably more efficient to have intelligent I/O and/or asymmetrical multiprocessing (i.e. one or more CPUs devoted exclusively to handling non-intelligent peripherals) than to have multiple general-purpose processors fielding I/O requests. --Brett To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-chat" in the body of the message
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