Date: Mon, 8 Oct 2007 12:31:26 -0500 From: Jeff Kramer <jeffk@well.com> To: Ivan Voras <ivoras@freebsd.org>, freebsd-stable@freebsd.org Subject: Re: PAE Slowdown Message-ID: <p06002007c330182a41ec@[192.168.0.5]> In-Reply-To: <fedngm$aa4$1@sea.gmane.org> References: <p06002004c33006420f72@[192.168.0.5]> <fedngm$aa4$1@sea.gmane.org>
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At 6:56 PM +0200 10/8/07, Ivan Voras wrote: >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. > >Does vmstat -i show unusually high interrupt rates? When it's running ok at idle (4 gig of ram): interrupt total rate irq1: atkbd0 77 0 irq16: twa0 1084 3 irq17: atapci0 1 0 irq19: fwohci0++ 3 0 irq20: em0 161 0 cpu0: timer 549165 1920 Total 550491 1924 When it's slow at idle (8 gig of ram): interrupt total rate irq1: atkbd0 48 0 irq16: twa0 1093 8 irq17: atapci0 1 0 irq19: fwohci0++ 3 0 irq20: em0 179 1 cpu0: timer 241862 1950 Total 243186 1961 -- Jeff Kramer jeffk@well.com http://www.jeffkramer.org/
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