From mboxrd@z Thu Jan 1 00:00:00 1970 Date: Sat, 16 Dec 2000 18:55:02 -0500 From: Daniel Jacobowitz To: linuxppc-dev@lists.linuxppc.org Subject: Re: SMP stall on process creation Message-ID: <20001216185502.A20357@drow.them.org> References: <20001216160004.A18814@drow.them.org> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii In-Reply-To: <20001216160004.A18814@drow.them.org>; from dmj+@andrew.cmu.edu on Sat, Dec 16, 2000 at 04:00:04PM -0500 Sender: owner-linuxppc-dev@lists.linuxppc.org List-Id: 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@debian.org | | dmj+@andrew.cmu.edu | \--------------------------------/ \--------------------------------/ ** Sent via the linuxppc-dev mail list. See http://lists.linuxppc.org/