Date: Thu, 31 Jan 2008 10:51:34 -0700 From: Scott Long <scottl@samsco.org> To: gary.jennejohn@freenet.de Cc: freebsd-scsi@freebsd.org Subject: Re: data corruption with ahc driver and 4GB of memory using a FBSD-8 64-bit installation? Message-ID: <47A20AA6.2020506@samsco.org> In-Reply-To: <20080130104615.717f3ff2@peedub.jennejohn.org> References: <20080130104615.717f3ff2@peedub.jennejohn.org>
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Gary Jennejohn wrote: > I think $(subject) says it all. > > I have a Gigabyte AM2 mobo with an AMD64 X2 CPU installed. > > The SCIS set up looks lie this: > > 29160N <--> da0 <--> da1 > > da0 has a 32-bit installation of FBSD-8 > da1 has a 64-bit installtion of FBSD-8 > > If I install 4GB of memory (4 DIMMs) in the system I see the following > behavior: > > a) booting from da0 works just fine and I can access both disks without > any problem. > > b) booting from da1 results in (apparent) data errors such that /bin/sh > dies with SIGILL and /rescue/sh dies with SIGSEGV. > > c) trying to do an installation of a snapshot of FBSD-8 to a SCSI disk > results in various problems, among others a kernel panic in ffs_balloc > during newfs. > > d) an installation to a SATA disk succeeds and the system runs just > fine. > > With only 3GB of memory everything works. Of course, I'd really like to > be able to use the entire 4GB. And I want to keep my SCSI disks. > > I suspect that ahc has some sort of problem in 64-bit mode. However, > I'm not certain whether the 32-bit installation works with 4GB simply > because the ahc driver uses bounce buffers. > > Has anybody else seen this? Can anyone confirm that ahc does indeed > have an error with 4GB and a 64-bit installation? > > BTW please put me in the Cc because I'm not subscribed to this ML. > The ahc driver should work with >4GB, and in fact that was a standard part of the test suite back when it was still in active development. If it doesn't work now then it's due to some sort of bitrot. I can try to test and debug it myself, but I'm pretty overcommitted so I can't guarantee that I'll get to it. If others would like to help test and debug, I'm happy to answer questions and provide assistance. Scott
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