Date: Wed, 24 Dec 2003 13:34:24 -0600 From: Kirk Strauser <kirk@strauser.com> To: Robert Watson <rwatson@freebsd.org> Cc: freebsd-current@freebsd.org Subject: Re: ATA + DMA still giving repeatable freezes Message-ID: <87r7yut3gf.fsf@strauser.com> In-Reply-To: <Pine.NEB.3.96L.1031219191506.46326P-100000@fledge.watson.org> (Robert Watson's message of "Fri, 19 Dec 2003 19:17:00 -0500 (EST)") References: <Pine.NEB.3.96L.1031219191506.46326P-100000@fledge.watson.org>
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At 2003-12-20T00:17:00Z, Robert Watson <rwatson@FreeBSD.org> writes:
> FYI, I had this problem on a notebook and foudn that disabling "device
> apic" made things clear up. Try it and see if it helps, and if it does,
> post as much. I'm busy testing to make sure my observation is right on my
> system. I also saw fairly frequent hangs starting or leaving XWindows,
> and John Baldwin hypothesized there was an interaction between DRM and the
> interrupt code.
Robert, I wanted to get in some more testing before reporting back. I
cvsup'ed again and built world and kernel. This time, I started with plain
GENERIC and made minor changes until I could reproduce the hangs.
Basically, commenting out "options WITNESS" and "options WITNESS_SKIPSPIN"
was enough to trigger the problem; I'm guessing that these options slow down
the system enough that timing issues disappear.
After adding this to my /boot/loader.conf.local:
hw.ata.ata_dma=3D"0"
hint.acpi.0.disabled=3D"1"
I no longer get system hangs, although I do get these messages at random
intervals during heavy ATA IO:
ad0: TIMEOUT - READ_MUL retrying (2 retries left)
ata0: resetting devices ..
done
=2D-=20
Kirk Strauser
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