Date: Thu, 19 Jul 2007 00:20:15 -0400 From: Scott Long <scottl@samsco.org> To: Tony Holmes <tony@crosswinds.net> Cc: freebsd-current@freebsd.org Subject: Re: 7.0/6.2, 4GB and AHC Message-ID: <469EE67F.8030504@samsco.org> In-Reply-To: <20070718133345.GA82366@crosswinds.net> References: <20070718133345.GA82366@crosswinds.net>
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The AHC driver was personally tested with >4GB while it was in active development, but it's certainly possible that bugs have crept in over the years. I'll test it when I get off vacation next week and see what I come up with. Please contact me directly if I forget. Just out of curiosity, try booting with one of your known bad configurations and break into the the loader prompt and do the following: set vm.old_contigmalloc=1 Scott Tony Holmes wrote: > I had a very interesting couple of days trying to figure out why 6.2-STABLE > and 7.0-CURRENT, both amd64, were giving me random hangs, panics etc. > > My system: > > Asus M2NPV-VM > 4GB Ram > 2 x Adaptec 19160 controllers > 14 x 33GB Seagate 10k rpm scsi in a disk shelf (2 channel) > 2 x 80GB Seagate SATA (geom mirror, system disks) > > I had the system installed with 6.2 and upgraded to 7.0- (for the new nfe > driver for the onboard NIC) and added the Adaptecs and disk. I began to play > with geom to set them up as a RAID 10 system for a database. Same configuration > on FreeBSD, solaris and other systems resulted in blazing fast performance. > > Set up the disks, fired up a basic bonnie test and... chug chug and eventual > random panic. Okay, maybe I messed up the geom config since I was tinkering > around. Reboot, wait for sync to finish.... 20 hours later it was done - way > too slow. Checked termination, cables, power, etc. All good. > > Fire up bonnie... first iteration showed approx 8MBps write approx 10MBps read > was horrendous. Decided to attempt a fresh reinstall. > > Load up 6.2R amd64 cd - panic on startup just after SCSI probe delay. Tried > once more and same thing. Okay, try 7.0 amd64. > > Divide by 0 error right after SCSI probe - and that's when the thought struck > me - 4GB ram... > > Pulled out 2GB and viola, 7.0 installed easily. Configured the Raid 10 and got > the nice 275MBps read and 150MBps (ballpark) benchmark numbers I was expecting. > > I know that amd64 supports 4gb+ (I have 2 others with SATA only that are > running flawlessly). > > So I am attempting to determine the cause of the failures. > > The adaptecs are 32bit with older bios (2.57 and 3.10). They are in the 2 > 32bit pci slots of the M2NPV motherboard. > > I would have thought FreeBSD would have knocked a memory hole in the 3.5-4gb > range to accomodate the device mappings. > > Does anyone have any explanations/pointers (I did search and attempt to RTFM > with not much luck) about this? >
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