From: Charles Forsyth <charles.forsyth@gmail.com>
To: Fans of the OS Plan 9 from Bell Labs <9fans@9fans.net>
Subject: Re: [9fans] syscall 53
Date: Mon, 19 May 2014 22:30:35 +0100 [thread overview]
Message-ID: <CAOw7k5j8SSo7sGbsp_1=eEeTQspUPuFt6Dgikz-v1_HU01LzJg@mail.gmail.com> (raw)
In-Reply-To: <CAP6exY+-2zG_6P+sM0SCF-sS7KT=T8qQo6o8C-dUBn_DPorZXg@mail.gmail.com>
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On 19 May 2014 21:54, ron minnich <rminnich@gmail.com> wrote:
> jitter-free time
Jitter says something about (in)consistency of time periods or intervals.
It will be a function of scheduling decisions, not the overhead of a single
call.
In Nix, on an AP core, sure, because there isn't any scheduling. When there
is scheduling of any sort,
it's the scheduling that results in the jitter, not either of these two
time implementations, surely.
You could clearly say "faster", but I'm not convinced about "jitter-free".
For instance, you can still be pre-empted for variable
time between the invocation of "nsec", its arrival in the kernel, and on
return from the kernel before and after return from "nsec".
Preventing that is a scheduling matter, with both implementations.
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next prev parent reply other threads:[~2014-05-19 21:30 UTC|newest]
Thread overview: 117+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-05-17 19:11 goo
2014-05-17 21:17 ` Jeff Sickel
2014-05-17 22:21 ` Jeff Sickel
2014-05-17 22:45 ` Skip Tavakkolian
2014-05-18 4:34 ` lucio
2014-05-18 8:29 ` David du Colombier
2014-05-18 15:28 ` Jeff Sickel
2014-05-18 15:32 ` Skip Tavakkolian
2014-05-18 15:34 ` Skip Tavakkolian
2014-05-18 15:38 ` Jeff Sickel
2014-05-18 16:03 ` Skip Tavakkolian
2014-05-18 22:55 ` Skip Tavakkolian
2014-05-19 1:54 ` erik quanstrom
2014-05-19 2:27 ` Jeff Sickel
2014-05-19 4:18 ` lucio
2014-05-19 12:50 ` erik quanstrom
2014-05-19 14:01 ` lucio
2014-05-19 16:24 ` erik quanstrom
2014-05-19 16:54 ` erik quanstrom
2014-05-19 17:16 ` lucio
2014-05-19 17:22 ` erik quanstrom
2014-05-19 17:13 ` lucio
2014-05-19 17:25 ` erik quanstrom
2014-05-19 19:50 ` Bakul Shah
2014-05-19 19:59 ` erik quanstrom
2014-05-19 20:54 ` ron minnich
2014-05-19 21:30 ` Charles Forsyth [this message]
2014-05-19 21:41 ` ron minnich
2014-05-19 23:02 ` Kurt H Maier
2014-05-19 23:06 ` andrey mirtchovski
2014-05-19 23:12 ` Kurt H Maier
2014-05-19 23:17 ` andrey mirtchovski
2014-05-20 0:09 ` Jeff Sickel
2014-05-19 21:34 ` Anthony Sorace
2014-05-20 14:04 ` erik quanstrom
2014-05-20 16:41 ` ron minnich
2014-05-20 17:14 ` erik quanstrom
2014-05-20 18:32 ` Kurt H Maier
2014-05-20 19:49 ` ron minnich
2014-05-20 19:54 ` erik quanstrom
2014-05-20 20:06 ` Kurt H Maier
2014-05-21 10:23 ` hiro
2014-05-20 20:33 ` Jeff Sickel
2014-05-21 1:37 ` Skip Tavakkolian
2014-05-21 15:40 ` lucio
2014-05-21 16:25 ` erik quanstrom
2014-05-21 16:56 ` Skip Tavakkolian
2014-05-21 20:05 ` Steffen Nurpmeso
2014-05-22 0:13 ` Bakul Shah
2014-05-22 3:25 ` [9fans] CMS/MMS (VCS/SCM/DSCM) [was: syscall 53] Jeff Sickel
2014-05-22 5:03 ` lucio
2014-05-22 5:07 ` lucio
2014-05-22 13:29 ` erik quanstrom
2014-05-22 13:50 ` lucio
2014-05-22 5:11 ` Bakul Shah
2014-05-22 5:26 ` lucio
2014-05-22 12:57 ` erik quanstrom
2014-05-22 13:43 ` lucio
2014-05-22 13:57 ` erik quanstrom
2014-05-22 5:28 ` lucio
2014-05-22 5:36 ` lucio
2014-05-22 6:00 ` Bakul Shah
2014-05-22 6:18 ` lucio
2014-05-22 12:45 ` erik quanstrom
2014-05-22 20:05 ` Bakul Shah
2014-05-22 20:11 ` erik quanstrom
2014-05-23 20:07 ` Steve Simon
2014-05-22 9:52 ` Aram Hăvărneanu
2014-05-22 10:29 ` lucio
2014-05-22 10:46 ` Aram Hăvărneanu
2014-05-22 13:03 ` erik quanstrom
2014-05-22 5:23 ` Skip Tavakkolian
2014-05-22 5:47 ` lucio
2014-05-22 12:49 ` erik quanstrom
2014-05-22 7:49 ` Alex Jordan
2014-05-22 12:49 ` Riddler
2014-05-22 3:43 ` [9fans] syscall 53 Kurt H Maier
2014-05-22 5:12 ` lucio
2014-05-22 16:15 ` Kurt H Maier
2014-05-22 5:36 ` Bakul Shah
2014-05-22 10:50 ` Aram Hăvărneanu
2014-05-21 17:01 ` lucio
2014-05-21 17:41 ` erik quanstrom
2014-05-21 19:08 ` lucio
2014-05-21 20:36 ` erik quanstrom
2014-05-22 4:46 ` lucio
2014-05-22 13:18 ` erik quanstrom
2014-05-22 13:39 ` lucio
2014-05-22 14:22 ` Riddler
2014-05-22 4:54 ` lucio
2014-05-22 13:07 ` erik quanstrom
2014-05-21 1:21 ` Skip Tavakkolian
2014-05-21 15:36 ` lucio
2014-05-21 15:57 ` erik quanstrom
2014-05-21 17:03 ` lucio
2014-05-21 16:50 ` Kurt H Maier
2014-05-21 18:02 ` hiro
2014-05-20 17:05 ` Bakul Shah
2014-05-20 17:28 ` erik quanstrom
2014-05-19 17:26 ` Charles Forsyth
2014-05-19 17:29 ` erik quanstrom
2014-05-19 19:15 ` Aram Hăvărneanu
2014-05-19 19:44 ` Charles Forsyth
2014-05-19 20:51 ` erik quanstrom
2014-05-20 3:52 ` cinap_lenrek
2014-05-19 4:15 ` lucio
2014-05-18 0:34 ` erik quanstrom
-- strict thread matches above, loose matches on Subject: below --
2014-05-21 18:26 sl
2014-05-21 18:31 ` erik quanstrom
2014-05-18 7:35 goo
2014-05-17 16:54 goo
2014-05-17 13:53 goo
2014-05-17 14:56 ` erik quanstrom
2014-05-17 10:23 goo
2014-05-17 12:11 ` erik quanstrom
2014-05-17 12:23 ` David du Colombier
2014-05-17 12:12 ` erik quanstrom
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