Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > comp.arch > #4294

Re: big-little

From Anne & Lynn Wheeler <lynn@garlic.com>
Newsgroups comp.arch
Subject Re: big-little
Date 2011-10-20 21:13 -0400
Organization Wheeler&Wheeler
Message-ID <m3pqhrf8pe.fsf@garlic.com> (permalink)
References <j7pu4q$ndv$1@USTR-NEWS.TR.UNISYS.COM> <b9d6n8-t49.ln1@ntp6.tmsw.no> <e30e404d-781f-4f60-87c1-df344dbc0a56@c25g2000yqn.googlegroups.com>

Show all headers | View raw

"Paul A. Clayton" <paaronclayton@gmail.com> writes:
> As noted, using a simple core to handle interrupts could have
> significant advantages: a simple core could probably wake-up
> faster and with less energy use and would be more efficient for
> code with less predictable branches and relatively frequent
> reads and writes to I/O devices.  Multithreading could enhance
> the efficiency for such tasks even more.

big mainframes found that taking asynchronous interrupts (and task
switching) played havoc with cache hit ratios. also as disks were
becoming more and more of bottleneck ... large complex operating systems
had long pathlengths between asynchronous interrupts and latency before
redriving device with next queued i/o ... was becoming significant
factor in improving thruput.

811 architecture (for nov78) that showed up in the early 80s with 3081
... provided for queued i/o redrive ... handled by dedicated hardware
w/o requiring operating system (removing device redrive latency). in the
late 70s, i did software rewrite of interrupt handler and device
handling to come very close to redrive latency of dedicated hardware
... but that didn't alleviate the cache hit problem related to
asynchronous interrupts.

earlier in the mid-70s ... related to cache hit ratio and multiprocessor
support ... i created mechanism that under high interrupts rate would
switch to blocking asynchronous interrupts and peridically polling.  the
delays somewhat reduced i/o thruput ... but slightly delaying interrupts
and then batch polling of all delayed/pending interrupts actually
improved overall thruput ... because of the cache hit ratio of "batch"
processing of the pending interrupts.

-- 
virtualization experience starting Jan1968, online at home since Mar1970

Back to comp.arch | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread

Thread

big-little timcaffrey@aol.com (Tim McCaffrey) - 2011-10-20 19:51 +0000
  Re: big-little Terje Mathisen <"terje.mathisen at tmsw.no"> - 2011-10-20 22:35 +0200
    Re: big-little Mark Thorson <nospam@sonic.net> - 2011-10-20 14:18 -0800
      Re: big-little nmm1@cam.ac.uk - 2011-10-21 07:54 +0100
        Re: big-little David Kanter <dkanter@gmail.com> - 2011-11-09 01:06 -0800
          Re: big-little nmm1@cam.ac.uk - 2011-11-09 11:07 +0000
      Re: big-little Terje Mathisen <"terje.mathisen at tmsw.no"> - 2011-10-21 09:25 +0200
      Re: big-little EricP <ThatWouldBeTelling@thevillage.com> - 2011-10-21 11:07 -0400
        Re: big-little timcaffrey@aol.com (Tim McCaffrey) - 2011-10-21 16:28 +0000
          Re: big-little nmm1@cam.ac.uk - 2011-10-21 17:07 +0100
          Re: big-little EricP <ThatWouldBeTelling@thevillage.com> - 2011-10-21 13:25 -0400
            Re: big-little timcaffrey@aol.com (Tim McCaffrey) - 2011-10-21 19:45 +0000
              Re: big-little EricP <ThatWouldBeTelling@thevillage.com> - 2011-10-22 14:44 -0400
          Re: big-little ChrisQ <meru@devnull.com> - 2011-10-22 16:57 +0000
            Re: big-little nmm1@cam.ac.uk - 2011-10-22 17:40 +0100
              Re: big-little ChrisQ <meru@devnull.com> - 2011-10-23 14:39 +0000
                Re: big-little nmm1@cam.ac.uk - 2011-10-23 16:11 +0100
                Re: big-little ChrisQ <meru@devnull.com> - 2011-10-23 17:44 +0000
                Re: big-little nmm1@cam.ac.uk - 2011-10-23 18:46 +0100
                Re: big-little Thomas Womack <twomack@chiark.greenend.org.uk> - 2011-10-23 19:30 +0100
                Re: big-little nmm1@cam.ac.uk - 2011-10-23 19:59 +0100
                Re: big-little BGB <cr88192@hotmail.com> - 2011-10-23 13:21 -0700
                Re: big-little Terje Mathisen <"terje.mathisen at tmsw.no"> - 2011-10-23 20:38 +0200
                Re: big-little nmm1@cam.ac.uk - 2011-10-23 22:38 +0100
                Re: big-little BGB <cr88192@hotmail.com> - 2011-10-23 17:56 -0700
                Re: big-little nmm1@cam.ac.uk - 2011-10-24 07:58 +0100
                Re: big-little BGB <cr88192@hotmail.com> - 2011-10-24 16:34 -0700
                Re: big-little nmm1@cam.ac.uk - 2011-10-25 08:09 +0100
                Re: big-little Terje Mathisen <"terje.mathisen at tmsw.no"> - 2011-10-25 14:52 +0200
                Re: big-little nmm1@cam.ac.uk - 2011-10-25 17:28 +0100
                Re: big-little BGB <cr88192@hotmail.com> - 2011-10-25 13:06 -0700
                Re: big-little BGB <cr88192@hotmail.com> - 2011-10-25 15:22 -0700
                Re: big-little "Andy \"Krazy\" Glew" <andy@SPAM.comp-arch.net> - 2011-10-25 19:47 -0700
                Re: big-little nmm1@cam.ac.uk - 2011-10-26 08:09 +0100
                Re: big-little Terje Mathisen <"terje.mathisen at tmsw.no"> - 2011-10-26 12:06 +0200
                Re: big-little nmm1@cam.ac.uk - 2011-10-26 10:47 +0100
                Re: big-little Terje Mathisen <"terje.mathisen at tmsw.no"> - 2011-10-26 11:58 +0200
                Re: big-little nmm1@cam.ac.uk - 2011-10-26 10:44 +0100
                Re: big-little Michael S <already5chosen@yahoo.com> - 2011-10-26 03:45 -0700
                Re: big-little nmm1@cam.ac.uk - 2011-10-26 11:45 +0100
                Re: big-little Michael S <already5chosen@yahoo.com> - 2011-10-26 09:15 -0700
                Re: big-little "Andy \"Krazy\" Glew" <andy@SPAM.comp-arch.net> - 2011-10-26 12:51 -0700
                Re: big-little Andrew Reilly <areilly---@bigpond.net.au> - 2011-10-26 11:45 +0000
                Re: big-little nmm1@cam.ac.uk - 2011-10-26 15:42 +0100
                Re: big-little Michael S <already5chosen@yahoo.com> - 2011-10-26 09:07 -0700
                Re: big-little "Andy \"Krazy\" Glew" <andy@SPAM.comp-arch.net> - 2011-10-26 12:53 -0700
                Re: big-little nmm1@cam.ac.uk - 2011-10-26 21:05 +0100
                Re: big-little Michael S <already5chosen@yahoo.com> - 2011-10-26 13:20 -0700
                Re: big-little "Andy \"Krazy\" Glew" <andy@SPAM.comp-arch.net> - 2011-10-26 17:55 -0700
                Re: big-little nmm1@cam.ac.uk - 2011-10-27 09:10 +0100
                Re: big-little Michael S <already5chosen@yahoo.com> - 2011-10-27 01:34 -0700
                Re: big-little nmm1@cam.ac.uk - 2011-10-27 10:29 +0100
                Re: big-little Michael S <already5chosen@yahoo.com> - 2011-10-27 04:28 -0700
                Re: big-little EricP <ThatWouldBeTelling@thevillage.com> - 2011-10-27 12:22 -0400
                Re: big-little timcaffrey@aol.com (Tim McCaffrey) - 2011-10-27 18:08 +0000
                Re: big-little Michael S <already5chosen@yahoo.com> - 2011-10-27 11:50 -0700
                Re: big-little Jean-Marc Bourguet <jm@bourguet.org> - 2011-10-27 14:10 +0200
                Re: big-little nmm1@cam.ac.uk - 2011-10-27 17:58 +0100
                Re: big-little Michael S <already5chosen@yahoo.com> - 2011-10-26 13:15 -0700
                Re: big-little Michael S <already5chosen@yahoo.com> - 2011-10-27 04:10 -0700
                Re: big-little MitchAlsup <MitchAlsup@aol.com> - 2011-10-27 14:04 -0700
                Re: big-little nmm1@cam.ac.uk - 2011-10-27 23:07 +0100
                Re: big-little Michael S <already5chosen@yahoo.com> - 2011-10-27 15:58 -0700
                Re: big-little Rick Jones <rick.jones2@hp.com> - 2011-10-27 22:57 +0000
                Re: big-little Michael S <already5chosen@yahoo.com> - 2011-10-27 16:39 -0700
                Re: big-little Rick Jones <rick.jones2@hp.com> - 2011-10-28 00:16 +0000
                Re: big-little nmm1@cam.ac.uk - 2011-10-28 09:52 +0100
                Re: big-little Michael S <already5chosen@yahoo.com> - 2011-10-28 07:01 -0700
                Re: big-little Rick Jones <rick.jones2@hp.com> - 2011-10-28 16:45 +0000
                Re: big-little Michael S <already5chosen@yahoo.com> - 2011-10-29 13:13 -0700
                Re: big-little Michael S <already5chosen@yahoo.com> - 2011-10-30 03:36 -0700
                Re: big-little Michael S <already5chosen@yahoo.com> - 2011-10-30 03:55 -0700
                Re: big-little MitchAlsup <MitchAlsup@aol.com> - 2011-10-28 11:15 -0700
                Re: big-little nmm1@cam.ac.uk - 2011-10-28 20:01 +0100
                Re: big-little timcaffrey@aol.com (Tim McCaffrey) - 2011-10-29 17:46 +0000
                Re: big-little Michael S <already5chosen@yahoo.com> - 2011-10-29 11:30 -0700
                Re: big-little nmm1@cam.ac.uk - 2011-10-29 20:02 +0100
                Re: big-little MitchAlsup <MitchAlsup@aol.com> - 2011-10-29 13:09 -0700
                Re: big-little "Paul A. Clayton" <paaronclayton@gmail.com> - 2011-10-29 17:42 -0700
                Re: big-little nmm1@cam.ac.uk - 2011-10-30 08:16 +0000
                Re: big-little MitchAlsup <MitchAlsup@aol.com> - 2011-11-04 10:06 -0700
                Re: big-little "Paul A. Clayton" <paaronclayton@gmail.com> - 2011-11-04 15:19 -0700
                Re: big-little nmm1@cam.ac.uk - 2011-11-05 09:13 +0000
                Re: big-little "Andy \"Krazy\" Glew" <andy@SPAM.comp-arch.net> - 2011-11-05 09:03 -0700
                Re: big-little Michael S <already5chosen@yahoo.com> - 2011-10-26 13:38 -0700
                Re: big-little Robert Wessel <robertwessel2@yahoo.com> - 2011-10-26 18:44 -0500
                Re: big-little Michael S <already5chosen@yahoo.com> - 2011-10-26 17:05 -0700
                Re: big-little Robert Wessel <robertwessel2@yahoo.com> - 2011-10-26 21:03 -0500
                Re: big-little EricP <ThatWouldBeTelling@thevillage.com> - 2011-10-26 14:37 -0400
                Re: big-little EricP <ThatWouldBeTelling@thevillage.com> - 2011-10-26 15:38 -0400
                Re: big-little EricP <ThatWouldBeTelling@thevillage.com> - 2011-10-26 16:06 -0400
                Re: big-little BGB <cr88192@hotmail.com> - 2011-10-27 00:15 -0700
                Re: big-little Morten Reistad <first@last.name> - 2011-11-03 17:30 +0100
                Re: big-little "Andy \"Krazy\" Glew" <andy@SPAM.comp-arch.net> - 2011-11-03 20:45 -0700
                Re: big-little Thomas Womack <twomack@chiark.greenend.org.uk> - 2011-11-04 11:13 +0000
                Re: big-little MitchAlsup <MitchAlsup@aol.com> - 2011-11-04 10:12 -0700
                Re: big-little BGB <cr88192@hotmail.com> - 2011-11-04 09:26 -0700
                Re: big-little EricP <ThatWouldBeTelling@thevillage.com> - 2011-11-05 11:32 -0400
                Re: big-little EricP <ThatWouldBeTelling@thevillage.com> - 2011-11-05 11:55 -0400
                Re: big-little BGB <cr88192@hotmail.com> - 2011-11-05 09:58 -0700
                Re: big-little Terje Mathisen <"terje.mathisen at tmsw.no"> - 2011-11-05 18:39 +0100
                Re: big-little BGB <cr88192@hotmail.com> - 2011-11-05 15:00 -0700
                Re: big-little wclodius@lost-alamos.pet (William Clodius) - 2011-11-05 18:43 -0600
                Re: big-little BGB <cr88192@hotmail.com> - 2011-11-05 19:46 -0700
                Re: big-little ChrisQ <meru@devnull.com> - 2011-11-11 12:31 +0000
                Re: big-little BGB <cr88192@hotmail.com> - 2011-11-11 12:39 -0700
                Re: big-little Chris Gray <cg@GraySage.com> - 2011-11-11 13:28 -0700
                Re: big-little BGB <cr88192@hotmail.com> - 2011-11-11 18:03 -0700
                Re: big-little Terje Mathisen <"terje.mathisen at tmsw.no"> - 2011-11-12 18:25 +0100
                Re: big-little BGB <cr88192@hotmail.com> - 2011-11-12 12:02 -0700
                cost of prolog/epilog (was: big-little) Kalle Olavi Niemitalo <kon@iki.fi> - 2011-11-12 22:57 +0200
                Re: cost of prolog/epilog Terje Mathisen <"terje.mathisen at tmsw.no"> - 2011-11-12 22:47 +0100
                Re: cost of prolog/epilog anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2011-11-14 09:45 +0000
                Re: cost of prolog/epilog Terje Mathisen <"terje.mathisen at tmsw.no"> - 2011-11-14 12:28 +0100
                Re: cost of prolog/epilog anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2011-11-15 16:48 +0000
                Re: cost of prolog/epilog Stefan Monnier <monnier@iro.umontreal.ca> - 2011-11-15 21:35 -0500
                Re: cost of prolog/epilog Bakul Shah <usenet@bitblocks.com> - 2011-11-16 02:41 -0800
                Re: cost of prolog/epilog nmm1@cam.ac.uk - 2011-11-16 18:14 +0000
                Re: cost of prolog/epilog BGB <cr88192@hotmail.com> - 2011-11-16 16:50 -0700
                Re: cost of prolog/epilog BGB <cr88192@hotmail.com> - 2011-11-14 17:00 -0700
                Re: cost of prolog/epilog torbenm@diku.dk (Torben Ægidius Mogensen) - 2011-11-15 10:26 +0100
                Re: cost of prolog/epilog BGB <cr88192@hotmail.com> - 2011-11-15 09:41 -0700
                Re: cost of prolog/epilog anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2011-11-15 16:40 +0000
                Re: cost of prolog/epilog Terje Mathisen <"terje.mathisen at tmsw.no"> - 2011-11-15 12:44 +0100
                Re: cost of prolog/epilog BGB <cr88192@hotmail.com> - 2011-11-15 09:01 -0700
                Re: cost of prolog/epilog Chris Gray <cg@GraySage.com> - 2011-11-15 15:18 -0700
                Re: cost of prolog/epilog BGB <cr88192@hotmail.com> - 2011-11-15 21:56 -0700
                Re: cost of prolog/epilog Terje Mathisen <"terje.mathisen at tmsw.no"> - 2011-11-16 09:21 +0100
                Re: cost of prolog/epilog anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2011-11-16 09:30 +0000
                Re: cost of prolog/epilog John Levine <johnl@iecc.com> - 2011-11-16 10:05 +0000
                Re: cost of prolog/epilog Terje Mathisen <"terje.mathisen at tmsw.no"> - 2011-11-16 11:08 +0100
                Re: cost of prolog/epilog Chris Gray <cg@GraySage.com> - 2011-11-16 16:29 -0700
                Re: cost of prolog/epilog BGB <cr88192@hotmail.com> - 2011-11-16 11:22 -0700
                Re: cost of prolog/epilog anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2011-11-17 13:27 +0000
                Re: cost of prolog/epilog BGB <cr88192@hotmail.com> - 2011-11-17 10:30 -0700
                Re: cost of prolog/epilog torbenm@diku.dk (Torben Ægidius Mogensen) - 2011-11-17 11:21 +0100
                Re: cost of prolog/epilog Terje Mathisen <"terje.mathisen at tmsw.no"> - 2011-11-17 11:56 +0100
                Re: cost of prolog/epilog timcaffrey@aol.com (Tim McCaffrey) - 2011-11-17 20:27 +0000
                Re: cost of prolog/epilog torbenm@diku.dk (Torben Ægidius Mogensen) - 2011-11-18 10:57 +0100
                Re: cost of prolog/epilog BGB <cr88192@hotmail.com> - 2011-11-17 10:42 -0700
                Re: cost of prolog/epilog (was: big-little) "Paul A. Clayton" <paaronclayton@gmail.com> - 2011-11-12 14:05 -0800
                Re: cost of prolog/epilog (was: big-little) Bernd Paysan <bernd.paysan@gmx.de> - 2011-11-18 02:39 +0100
                Re: cost of prolog/epilog torbenm@diku.dk (Torben Ægidius Mogensen) - 2011-11-18 10:59 +0100
                Re: cost of prolog/epilog Bernd Paysan <bernd.paysan@gmx.de> - 2011-11-18 22:06 +0100
                Re: cost of prolog/epilog (was: big-little) mac <acolvin@efunct.com> - 2011-11-20 23:01 +0000
                Re: cost of prolog/epilog Chris Gray <cg@GraySage.com> - 2011-11-13 13:35 -0700
                Re: big-little wclodius@lost-alamos.pet (William Clodius) - 2011-11-11 22:13 -0700
                Re: big-little BGB <cr88192@hotmail.com> - 2011-11-11 23:43 -0700
                Re: big-little Chris Gray <cg@GraySage.com> - 2011-11-12 14:08 -0700
                Re: big-little BGB <cr88192@hotmail.com> - 2011-11-12 19:10 -0700
                Re: big-little Chris Gray <cg@GraySage.com> - 2011-11-13 13:40 -0700
                Re: big-little Bakul Shah <usenet@bitblocks.com> - 2011-11-13 14:49 -0800
                Re: big-little BGB <cr88192@hotmail.com> - 2011-11-13 18:51 -0700
                Re: big-little Terje Mathisen <"terje.mathisen at tmsw.no"> - 2011-10-24 10:12 +0200
                Re: big-little Stefan Monnier <monnier@iro.umontreal.ca> - 2011-10-24 12:11 -0400
                Re: big-little "Paul A. Clayton" <paaronclayton@gmail.com> - 2011-10-24 10:28 -0700
                Re: big-little nospam@ab-katrinedal.dk (Niels Jørgen Kruse) - 2011-10-24 19:38 +0200
                Re: big-little Terje Mathisen <"terje.mathisen at tmsw.no"> - 2011-10-24 21:02 +0200
                Re: big-little "Paul A. Clayton" <paaronclayton@gmail.com> - 2011-10-23 12:02 -0700
        Re: big-little Morten Reistad <first@last.name> - 2011-11-03 00:51 +0100
    Re: big-little "Paul A. Clayton" <paaronclayton@gmail.com> - 2011-10-20 16:59 -0700
      Re: big-little Anne & Lynn Wheeler <lynn@garlic.com> - 2011-10-20 21:13 -0400
      Re: big-little nmm1@cam.ac.uk - 2011-10-21 08:01 +0100
        Re: big-little "Paul A. Clayton" <paaronclayton@gmail.com> - 2011-10-21 05:39 -0700
        Re: big-little torbenm@diku.dk (Torben Ægidius Mogensen) - 2011-10-24 10:18 +0200
      Re: big-little Pedro Pereira <ppereira@grupopie.com> - 2011-10-21 10:40 +0100
        Re: big-little Paul Gotch <paulg@at-cantab-dot.net> - 2011-10-21 12:42 +0100
    Re: big-little nik Simpson <nik_s@knology.net> - 2011-10-21 11:00 -0500
  Re: big-little Rick Jones <rick.jones2@hp.com> - 2011-10-20 21:13 +0000
    Re: big-little timcaffrey@aol.com (Tim McCaffrey) - 2011-10-20 21:43 +0000
    Re: big-little Terje Mathisen <"terje.mathisen at tmsw.no"> - 2011-10-21 09:23 +0200
      Re: big-little Terje Mathisen <"terje.mathisen at tmsw.no"> - 2011-10-21 14:35 +0200
        Re: big-little Rick Jones <rick.jones2@hp.com> - 2011-10-21 17:15 +0000
      Re: big-little BGB <cr88192@hotmail.com> - 2011-10-21 16:41 -0700
  Re: big-little jacko <jackokring@gmail.com> - 2011-10-26 14:12 -0700

csiph-web