Date: Tue, 12 Sep 2000 13:33:56 +0200 From: Poul-Henning Kamp <phk@critter.freebsd.dk> To: Alfred Perlstein <bright@wintelcom.net> Cc: arch@FreeBSD.ORG Subject: Re: what to do with softinterrupts? Message-ID: <73658.968758436@critter> In-Reply-To: Your message of "Tue, 12 Sep 2000 04:26:54 PDT." <20000912042654.L12231@fw.wintelcom.net>
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In message <20000912042654.L12231@fw.wintelcom.net>, Alfred Perlstein writes: >Poul-Henning Kamp thought that investigating atomic ops and >keeping most of the current scheme of things would also work. Well, that's not *quite* what I meant. First we should exploit atomic ops all the places we can. Atomics are cheaper than anything we can ever do with threads. What we do next is the good question. I think something like the lazy-switch we (intend to) do for hw-interrupts sounds promising: foo_input() runs as far as it can without blocking, when it needs to block, it does so in a another thread and continues input processing for other packets. We could either have one thread per PCB socket standby for this use, but that's probably a waste of threads, or we can snatch them from a pool of threads cached for that purpose. I seriously don't think we can decide which way to go until we have basically tried all the candidates in practice. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 phk@FreeBSD.ORG | TCP/IP since RFC 956 FreeBSD coreteam member | BSD since 4.3-tahoe Never attribute to malice what can adequately be explained by incompetence. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-arch" in the body of the message
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