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List: linuxppc-dev
Subject: SMP stall on process creation
From: dmj+ () andrew ! cmu ! edu (Daniel Jacobowitz)
Date: 2000-12-16 23:55:02
Message-ID: 20001216185502.A20357 () drow ! them ! org
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On Sat, Dec 16, 2000 at 04:00:04PM -0500, Daniel Jacobowitz wrote:
>
> I've been using a dual G4/500 with the linuxppc_2_5 tree for a couple weeks
> now, and having all sorts of strange problems. While trying to debug one
> (console corruption on select, and sometimes on boot), I discovered
> something very interesting.
Which was VGA console stuff, by the way. I'm trying to get a second
opinion from linux-fbdev before touching the code though.
> I ran, in zsh, this command:
> % time (for i in {1..100}; do /bin/echo -n; done)
>
> on several machines. On an old 604e/200:
> 0.52s user 1.25s system 100% cpu 1.759 total
>
> On a dual-450 celeron system:
> 0.15s user 0.18s system 62% cpu 0.530 system
>
> But on the G4:
> 0.07s user 6.24s system 100% cpu 6.302 total
And with test13:
0.16s user 0.53s system 101% cpu 0.681 total
Much better. Whatever it was seems to have wandered away again. Note
that we're still a solid thirty percent slower than x86 at this - I'll
try to work out why some other time.
Dan
/--------------------------------\ /--------------------------------\
| Daniel Jacobowitz |__| SCS Class of 2002 |
| Debian GNU/Linux Developer __ Carnegie Mellon University |
| dan at debian.org | | dmj+ at andrew.cmu.edu |
\--------------------------------/ \--------------------------------/
** Sent via the linuxppc-dev mail list. See http://lists.linuxppc.org/
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