Date: Tue, 01 Feb 2011 20:17:36 +0100 From: Ralf Folkerts <ralf.folkerts@gmx.de> To: freebsd-amd64@freebsd.org Subject: Check 64 bit DMA from Disk-Controller (amd64/135040) Message-ID: <4D485C50.3040600@gmx.de>
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Hi, I asked this a while ago but didn't get a reply - as, however, no one replied that such a check is impossible I'd like to ask again: My SB600 ATA-Controller used to cause massive Problems (from disk not being detected at all to disk being detected but later "trashed" during buildworld) with DMA with 4G RAM. I circumvented that by setting "hw.physmem=4g", as recommended by John Baldwin. Now I'd like to perform a test, if this DMA-issue was *really* fixed by a recent BIOS-Update. How can such a test being performed? Or is it impossible at all? I already ran several buildworld/buildkernel instalworld/installkernel to a "fresh" disk in a row after the BIOS-Update - and didn't see any Problems - unlike previously where the disk was at latest trashed during the first run. However, I have no idea whether these runs were successful because of the DMA issue being fixed or simply because by some coincidence no DMA was being performed beyond 32 bit addressability. Would really be cool to get some confidence - as I'd like to run ZFS but don't think it'll be much fun with the hw.physmem being set to 4g :-( Many thanks in advance! Btw: System is now "8.1-STABLE FreeBSD 8.1-STABLE #0: Fri Nov 12 19:45:42 CET 2010 amd64" I ran my Tests against the 8.1 RELEASE (booted off USB Stick, then installed to a "fresh" disk. Cheers, _ralf_help
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