Date: Sat, 7 Nov 2015 22:51:14 +1100 (EST) From: Bruce Evans <brde@optusnet.com.au> To: Hans Petter Selasky <hps@selasky.org> Cc: Bruce Evans <brde@optusnet.com.au>, Rasool Al-Saadi <ralsaadi@swin.edu.au>, Luigi Rizzo <rizzo@iet.unipi.it>, "freebsd-net@freebsd.org" <freebsd-net@freebsd.org> Subject: Re: Timing issue with Dummynet on high kernel timer interrupt Message-ID: <20151107223816.D1837@besplex.bde.org> In-Reply-To: <563DD6B2.8010607@selasky.org> References: <6545444AE21C2749939E637E56594CEA3C0DCCC4@gsp-ex02.ds.swin.edu.au> <5638B7B5.3030802@selasky.org> <6545444AE21C2749939E637E56594CEA3C0DE7FF@gsp-ex02.ds.swin.edu.au> <563B2703.5080402@selasky.org> <6545444AE21C2749939E637E56594CEA3C0E0BD9@gsp-ex02.ds.swin.edu.au> <563C6864.2090907@selasky.org> <CA%2BhQ2%2Bhm2z0MkB-8w5xJM7%2Biz13r_ZjwmpZBnb30_D_48gaf-w@mail.gmail.com> <563C786C.1050305@selasky.org> <CA%2BhQ2%2Bj0WiGgzV119M1ZQiXP5Z7fq7deVxDPkOhvTc7hpTETKw@mail.gmail.com> <563CC186.9000807@selasky.org> <6545444AE21C2749939E637E56594CEA3C0E1B79@gsp-ex02.ds.swin.edu.au> <20151107162915.A893@besplex.bde.org> <563DD6B2.8010607@selasky.org>
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On Sat, 7 Nov 2015, Hans Petter Selasky wrote: > On 11/07/15 07:19, Bruce Evans wrote: >> I don't know if CTLFLAG_RWTUN with SYSCTL_PROC() actually works for all >> types, but it is used with CTLFLAG_STRING for kern.corefile. This is >> another bogus undocumented tunable. It is better documented as a sysctl >> than most since it is old so it is documented in sysctl(8). It is not >> documented as a tunable there of course. It is also not documented as >> a tunable in core(5). > > SYSCTL_PROC() works with RWTUN from /boot/loader.conf, as long as the > procedure callback handles early calls during boot. Hmm, that would be messy if it wants to do hardware stuff like sysctl_kern_eventtimer_periodic() does. Timercounters only have 1 MI tunable (sysctl_kern_timecounter_adjprecision). It has a (cold) check to avoid doing too much. Bruce
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