Date: Sun, 18 Dec 2011 23:42:21 -0700 From: Warner Losh <imp@bsdimp.com> To: Adrian Chadd <adrian@FreeBSD.org> Cc: Oleksandr Tymoshenko <gonzo@FreeBSD.org>, "freebsd-embedded@freebsd.org" <freebsd-embedded@FreeBSD.org> Subject: Re: Updated switch/glue patch? Message-ID: <2CBD8651-E132-49DC-A082-37A8F5C626EA@bsdimp.com> In-Reply-To: <CAJ-VmokgiQCEG4et3X=3o_MuCMkO9MqkKqa-fjdpEqQNucn=Lw@mail.gmail.com> References: <CAJ-Vmon8%2BOXQ4g752zZEB-O0BR0sFWO0QUvw--xp2jsBDkx6tQ@mail.gmail.com> <0F6CC18F-6973-42A2-AC03-F01BF59458AE@lassitu.de> <CAJ-Vmo=Y8pp4iFnw%2B1hcPae6QXFboz=a7puwgC1kVSZ3JwMgPQ@mail.gmail.com> <1100F70E-9DA9-4163-AC9A-423ECE5AA9A3@lassitu.de> <CAJ-VmonrnJ7cC6u2LsL9AGusz_%2BkSwY62Rr1__sg5U_NynJ1SQ@mail.gmail.com> <CAJ-Vmo=WSN1oLM=B2HqSHrWyOaOD9BSwwu8=1Wys0CLRJ_N-TA@mail.gmail.com> <C637C171-A1A2-4296-84FA-6DE97137DC42@lassitu.de> <CAJ-Vmon2boy7OCh_4O0MeCi0yCdZu0OYb5dxHCEK=-%2B46zBGtg@mail.gmail.com> <CAJ-Vmoku5eLEYi5_DXVxK=0=4Ewn2aGepv3YUw4ApuVh_7y2%2Bw@mail.gmail.com> <CAJ-VmonvpnaS1rAO%2BsDRh1E5WfsrZTYE297Kc96prhfKjrM89Q@mail.gmail.com> <CAJ-VmokQxQs2DUKL=ONyxnnS7Q28ytmwZJ_thqvc4SvMkmS=cQ@mail.gmail.com> <18CABB46-9B9A-41CB-8742-6723C5FF4D67@lassitu.de> <C0BF20FD-E30F-4E9C-A0FE-500BE4807B99@bsdimp.com> <CAJ-VmokgiQCEG4et3X=3o_MuCMkO9MqkKqa-fjdpEqQNucn=Lw@mail.gmail.com>
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On Dec 18, 2011, at 9:20 PM, Adrian Chadd wrote: > On 18 December 2011 16:29, Warner Losh <imp@bsdimp.com> wrote: >=20 >> What is it without WITNESS? The performance numbers with WITNESS are = generally uninteresting for a deployed system. >=20 > It's still ridiculously CPU intensive. :( It turns out trying to do > those locks three times one each GPIO IO line fiddle is a bit over the > top. That's the real problem. WITNESS is a known pigdog on low-end systems, = so measurements with it tend to skew the results a tad too much. On the = other hand, it did magnify the problem to the point it was fixed :) The insane locking should be fixed. Warner
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