Date: Mon, 30 Jan 2012 10:30:31 -0700 From: Ian Lepore <freebsd@damnhippie.dyndns.org> To: Andriy Gapon <avg@freebsd.org> Cc: freebsd-current@freebsd.org Subject: Re: revisiting tunables under Safe Mode menu option Message-ID: <1327944631.1686.24.camel@revolution.hippie.lan> In-Reply-To: <4F26CC5A.2070501@FreeBSD.org> References: <4F26CC5A.2070501@FreeBSD.org>
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On Mon, 2012-01-30 at 18:59 +0200, Andriy Gapon wrote: > > o hw.ata.ata_dma, hw.ata.atapi_dma - I am not sure if there have been any > significant problems with ATA DMA recently. Maybe these could be removed? I still have to work with hardware that requires ata_dma disabled. It seems to be required for most systems I've worked with that have a compact flash socket on the mainboard (sometimes you can just limit the mode to udma33 or less, sometimes you have to turn it off completely.) Adding kern.eventtimer.periodic=1 seems like a good idea. As a general philosophical thing, I don't have a problem with the idea "safe mode turns off everything that has ever historically been problematic," because I don't think anyone expects a system to run well in safe mode. I see it more as a tool to start narrowing down the area of trouble, like step 1 of a binary search for the problem. As such, the most important aspect is a comprehensive list of what changes for safe mode, so that you can procede by selectively en/disabling the various things it does. -- Ian
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