Date: Tue, 17 Jan 2006 13:47:30 -0600 From: Michael Barnett <mbarnett@measuremap.com> To: freebsd-questions@freebsd.org Subject: PAE causing system crashes Message-ID: <47A794C0-FE22-46FC-9D81-BCF3359CBD61@measuremap.com>
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I have 3 dell machines with 2x xeon procs, 8G of ram, and a half terabyte raid 5. I attempted to run the AMD64 distribution on these boxes which was fine for everything except mysql, (which is all these boxes are going to do) so I reinstalled 5.4 i386. uname -a looks like (hostname obscured): FreeBSD myhost.mydomain.com 5.4-RELEASE-p9 FreeBSD 5.4-RELEASE-p9 #2: Mon Jan 16 23:27:12 PST 2006 root@myhost.mydomain.com:/usr/obj/ usr/src/sys/SMP-PAE i386 My problem is, if i don't enable PAE in the kernel, i can only address half the ram in the boxes, but... the machines are stable. If i do enable PAE, i can address all the memory, but they randomly reboot without dumping any errors or logging. To enable PAE, i am building and booting off the following kernel config: <snip> include PAE ident SMP-PAE options SMP options KVA_PAGES=512 </snip> I added the KVA_PAGES options hoping to stabilize the machine (doesn't seem to have made any difference.) The only other tuning i am doing at the moment is in loader.conf: <snip> kern.maxdsiz="2147483648" # Set the max data size </snip> When i boot without PAE I use the generic SMP kernel, and the machine is stable. I know that there are a number of other kernel tunables i could be tweaking, but I am not really sure where to start as the machine dies silently. I was hoping that someone who has run a stable PAE kernel with 8G of ram + could point me in the right direction. Thanks, -Michael
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