From: David Edelsohn <dje@watson.ibm.com>
To: Gabriel Paubert <paubert@iram.es>
Cc: Takashi Oe <toe@unlserve.unl.edu>,
Benjamin Herrenschmidt <bh40@calva.net>,
Martin Costabel <costabel@wanadoo.fr>,
linuxppc-dev@lists.linuxppc.org, Iain Sandoe <iain@sandoe.co.uk>
Subject: Re: rtc again...
Date: Fri, 04 Aug 2000 11:25:06 -0400 [thread overview]
Message-ID: <200008041525.LAA30014@mal-ach.watson.ibm.com> (raw)
In-Reply-To: Message from Gabriel Paubert <paubert@iram.es> of "Fri, 04 Aug 2000 10:55:36 +0200." <Pine.HPX.4.10.10008041038130.9070-100000@gra-ux1.iram.es>
>>>>> Gabriel Paubert writes:
Gabriel> What I need to know from people with an SMP machine:
Gabriel> - are the timebases synchronized ? Or is there a way to synchronize them ?
On RS/6000 CHRP (RS/6000 Platform Architecture), RTAS provides
freeze-time-base and thaw-time-base calls which signal all of the
processors inan SMP complex to stop and start the TB. I do not know of
any functionality within the PowerPC architecture which would allow
processors to coordinate their TBs without some external intervention.
Normally AIX boot freezes the TB, zeroes the TB on each processor,
and then starts the timebase synchronized. Because the functionality is
part of RTAS, this can be done at any time. I do not know what PreP SMP
systems do and I know that Apple discourages use of RTAS because it is not
intended to work.
David
** Sent via the linuxppc-dev mail list. See http://lists.linuxppc.org/
next prev parent reply other threads:[~2000-08-04 15:25 UTC|newest]
Thread overview: 64+ messages / expand[flat|nested] mbox.gz Atom feed top
2000-08-02 22:48 rtc again Iain Sandoe
2000-08-03 9:00 ` Martin Costabel
2000-08-03 9:30 ` Benjamin Herrenschmidt
2000-08-03 10:54 ` Gabriel Paubert
2000-08-03 11:14 ` Benjamin Herrenschmidt
2000-08-03 11:25 ` Gabriel Paubert
2000-08-03 11:45 ` Gabriel Paubert
2000-08-03 13:25 ` Benjamin Herrenschmidt
2000-08-03 23:33 ` Takashi Oe
2000-08-04 8:55 ` Gabriel Paubert
2000-08-04 15:25 ` David Edelsohn [this message]
2000-08-04 15:50 ` Benjamin Herrenschmidt
2000-08-07 12:33 ` Gabriel Paubert
2000-08-07 11:51 ` Gabriel Paubert
2000-08-07 13:18 ` Benjamin Herrenschmidt
2000-08-07 15:14 ` David Edelsohn
2000-08-07 21:16 ` Gabriel Paubert
2000-08-08 1:39 ` Paul Mackerras
2000-08-11 11:04 ` Gabriel Paubert
2000-08-12 6:29 ` Paul Mackerras
2000-08-12 12:02 ` Ethan Benson
2000-08-12 12:51 ` Gabriel Paubert
2000-08-12 18:46 ` Gabriel Paubert
2000-09-17 16:47 ` dual G4 time issues Troy Benjegerdes
2000-08-14 12:59 ` rtc again Gabriel Paubert
[not found] ` <Pine.LNX.3.96LJ1.1b7.1000803182949.650C-100000@ofey.earthl ink.net>
2000-08-03 23:58 ` Franz Sirl
2000-08-04 0:33 ` Takashi Oe
2000-08-04 12:54 ` Benjamin Herrenschmidt
2000-08-04 13:40 ` Takashi Oe
2000-08-04 13:20 ` Geert Uytterhoeven
2000-08-08 11:20 ` Gabriel Paubert
2000-08-03 10:31 ` Franz Sirl
-- strict thread matches above, loose matches on Subject: below --
2000-08-03 9:41 Iain Sandoe
2000-08-03 9:56 Iain Sandoe
2000-08-03 10:13 ` Benjamin Herrenschmidt
2000-08-03 11:58 ` Martin Costabel
2000-08-03 11:24 Iain Sandoe
[not found] <20000804205524.383@192.168.1.10>
2000-08-05 1:10 ` Takashi Oe
2000-08-05 11:25 ` Benjamin Herrenschmidt
2000-08-05 14:44 ` Takashi Oe
2000-08-08 11:35 Iain Sandoe
2000-08-08 13:14 ` Geert Uytterhoeven
2000-08-08 14:31 Iain Sandoe
2000-08-08 17:08 ` Michael Schmitz
2000-08-08 17:41 ` Benjamin Herrenschmidt
2000-08-08 22:44 ` Gabriel Paubert
2000-08-09 8:44 ` Benjamin Herrenschmidt
2000-08-09 11:32 ` Martin Costabel
2000-08-09 13:50 ` Gabriel Paubert
2000-08-09 15:25 ` Benjamin Herrenschmidt
2000-08-09 16:54 ` Takashi Oe
2000-08-09 17:04 ` Benjamin Herrenschmidt
2000-08-09 23:12 ` Takashi Oe
2000-08-09 23:48 ` Benjamin Herrenschmidt
2000-08-09 22:13 ` Gabriel Paubert
2000-08-09 22:48 ` Benjamin Herrenschmidt
2000-08-10 3:08 ` Gabriel Paubert
2000-08-10 0:00 ` William Blew
2000-08-09 14:26 ` Takashi Oe
2000-08-09 0:55 ` Takashi Oe
2000-08-09 8:48 ` Benjamin Herrenschmidt
2000-08-09 16:37 ` Takashi Oe
2000-08-09 22:46 ` Gabriel Paubert
2000-08-09 14:24 ` Geert Uytterhoeven
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=200008041525.LAA30014@mal-ach.watson.ibm.com \
--to=dje@watson.ibm.com \
--cc=bh40@calva.net \
--cc=costabel@wanadoo.fr \
--cc=iain@sandoe.co.uk \
--cc=linuxppc-dev@lists.linuxppc.org \
--cc=paubert@iram.es \
--cc=toe@unlserve.unl.edu \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).