On Jan 30, 2012, at 11:30 AM, Ian Lepore wrote:
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.
I second the point about ATA DMA, but it is worth pointing out that
those sysctls don't do anything with ATA_CAM (see http://www.freebsd.org/cgi/query-pr.cgi?pr=164226)
.
-Nathan
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