Date: Fri, 9 May 2014 12:33:58 -0700 From: Adrian Chadd <adrian@freebsd.org> To: John Baldwin <jhb@freebsd.org> Cc: Alexander Motin <mav@freebsd.org>, freebsd-current <freebsd-current@freebsd.org>, "freebsd-arch@freebsd.org" <freebsd-arch@freebsd.org> Subject: Re: [rfc] bind per-cpu timeout threads to each CPU Message-ID: <CAJ-VmokL40MGY2=sKAtvgMBKHt6ZRY9ZfnZ1Mj5y1qAa4ANC=A@mail.gmail.com> In-Reply-To: <201405091349.14381.jhb@freebsd.org> References: <530508B7.7060102@FreeBSD.org> <CAJ-VmonUiSeCxnbYcjtWZ8uxa0c2ys5Za_GMLQenwu8zmEuFpQ@mail.gmail.com> <CAJ-VmonmrB7Z-PKH7P1DOJjSvFD_nRHqaiFJUuwvHoTUtiEVoQ@mail.gmail.com> <201405091349.14381.jhb@freebsd.org>
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On 9 May 2014 10:49, John Baldwin <jhb@freebsd.org> wrote: > On Thursday, May 08, 2014 11:43:39 pm Adrian Chadd wrote: >> Hi, >> >> I'd like to revisit this now. >> >> I'd like to commit this stuff as-is and then take some time to revisit >> the catch-all softclock from cpu0 swi. It's more complicated than it >> needs to be as it just assumes timeout_cpu == cpuid of cpu 0. So >> there's no easy way to slide in a new catch-all softclock. >> >> Once that's done I'd like to then experiment with turning on the pcpu >> tcp timer stuff and gluing that into the RSS CPU ID / netisr ID stuff. >> >> Thanks, > > To be clear, are you going to commit the change to bind all but CPU 0 > to their CPU but let the "default" swi float for now? I think that is > fine to commit, but I wouldn't want to bind the "default" swi for now. I'd like to do it in the other order and bind everything, so things like the per-CPU TCP timer thing can be flipped on for RSS and actually be useful. I'm looking into what it'd take to create a separate default swi as well as a cpu-0 swi but as I said, it's pretty hairy there. How about i instead do the comprimise: * i'll pin all other swi's * default swi isn't pinned by default, but one can flip on a sysctl at boot time to pin it How's that sound? -a
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