Date: Thu, 22 Feb 2001 07:53:59 -0800 From: Julian Elischer <julian@elischer.org> To: Robin Cutshaw <robin@XFree86.Org> Cc: Peter Wemm <peter@netplex.com.au>, freebsd-hackers@FreeBSD.ORG Subject: Re: Build timings - FreeBSD 4.2 vs. Linux Message-ID: <3A953617.CD81D643@elischer.org> References: <20010219134043.A8347@intercore.com> <200102192021.f1JKLQr61572@mobile.wemm.org> <20010221090207.A11473@intercore.com>
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Robin Cutshaw wrote:
>
> On Mon, Feb 19, 2001 at 12:21:26PM -0800, Peter Wemm wrote:
> > >
> > > Any ideas as to why it would take almost three times longer to build
> > > on FreeBSD?
> >
> > This is probably a silly question, but you did recompile the kernel for
> > SMP, right?
> >
>
> Actually, I was using the stock GENERIC UP kernel. I wanted to get a
> baseline.
>
> > Have you tuned the FreeBSD kernel? It still ships with a worst-case
> > configuration so that it runs optimally on i386 cpus. :-( Copy GENERIC
> > to something else and remove all but 'cpu i686', rebuild and install.
> > Also, get rid of 'sl', and 'ppp' from the kernel config as that messes
> > up certain things (interrupt masks). Ideally, do a proper cleanup and
> > configure it for your specific hardware (ie: remove all the other ethernet
> > drivers, etc).
> >
>
> There's a problem here. I tried to configure an SMP kernel but when it
> booted the fxp0 (Compaq dual eepro100 adapter) got timeout errors and
> wouldn't work. I went back and did the config/make on the GENERIC
> kernel and booted it. Same thing. The stock GENERIC kernel that came
> with the dist works just fine. Any ideas?
>
> One other problem I've seen with the Compaq 8500 system. FreeBSD doesn't
> see the pci adapter on the secondary bus. I had to move the ethernet
> adapter to the primary bus for it to work.
>
> >
> > A couple of possibilities.. If you want to compare the two side by side,
> > try mounting the freebsd filesystems in async mode, just like linux does by
> > default. In particular, make sure you get /tmp, /var/tmp and wherever your
> > build is.
> >
>
> OK, I set softupdates on the disk/partition that the build source/target
> is on. It made no difference in timing. I then created a memory disk,
> set softupdates on it, and mounted it as /tmp.
soft updates is pointless on a ram disk.
but it makes a huge difference if /tmp is on disk.
> AMAZINGLY, the build
> went from 2:50 to 0:40, now much faster than the Linux system. I'm
> going to do the ram disk thing on Linux and see if it makes a difference.
turn soft updtes off again on it.. it is just wasting CPU cycles.
>
> Once I figure out the fxp0 problem from above, I'll do a parallel build
> and see what speedups occur.
>
> Thanks!
> Robin
> --
> ----
> Robin Cutshaw internet: robin@interlabs.com robin@intercore.com
> Internet Labs, Inc. BellNet: 404-713-4000 robin@XFree86.Org
> XFree86 coreteam/board member
>
> "Time is just one damn thing after another" -- PBS/Nova
> ----
> --
>
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