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Date: Mon, 8 Oct 2007 12:21:02 -0500
To: freebsd-stable@freebsd.org
From: Jeff Kramer <jeffk@well.com>
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Subject: Re: PAE Slowdown
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More weirdness, if I take out 4 gig of ram and only run with 4 total, 
the PAE kernel works fine.


At 11:23 AM -0500 10/8/07, Jeff Kramer wrote:
>Hey all,
>
>I know that AMD64's the preferred way to run >4 gig systems, but I'm 
>having a weird situation with 6.2-RELEASE-p8 and 6-STABLE as of last 
>night.  When I compile the PAE kernel, my system performance drops 
>like a rock.  It still boots and everything still runs, but for 
>instance, running the Flops port my megaflops drop from the 950 
>MFLOPS range to 4 MFLOPS.  It feels about as fast as a 486.
>
>I'm not sure what I should try disabling.  I tried nodevice usb, but 
>that didn't seem to change anything.  SMP and GENERIC kernels work 
>fine.
>
>CPU: Intel Core Duo 2 Quad 2.4ghz
>Memory: 8 gig (4 2 gig dimms)
>Swap: 16 gig partition

-- 

Jeff Kramer
jeffk@well.com
http://www.jeffkramer.org/