Date: Sat, 29 Nov 2003 11:33:58 -0500 From: Don Bowman <don@sandvine.com> To: 'Uwe Doering' <gemini@geminix.org>, freebsd-gnats-submit@FreeBSD.org Cc: freebsd-stable@freebsd.org Subject: RE: kern/59719 Re: 4.9 Stable Crashes on SuperMicro with SMP Message-ID: <FE045D4D9F7AED4CBFF1B3B813C85337035E3F61@mail.sandvine.com>
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From: Uwe Doering [mailto:gemini@geminix.org] > Jonathan Gilpin wrote: > > I've run memtest (memtest86.com) kindly provided by Don and > it passed all > > the tests. I've installed installed a kernel module to test > for memory > > errors and found that again no memory errors are found... > So this means it's > > either a problem with the CPU's or a geniune bug in the > kernel. (bugger!) > > No, that's unfortunately not what it means. If a memory test > fails you > can draw the conclusion that you have bad memory, but this > doesn't work > the other way round. If a memory test passes there is still a > possibility that a memory chip is the culprit since memory > test software > cannot find all errors. > > Also, there is the chip set on the mainboard that coordinates > bus access > etc. for the two CPUs. Mainboard and chip set developers are > known to > make errors, too. In this case you would have to swap the entire > mainboard, possible with one from a different manufacturer. > I can tell > you from my own experience that it is really hard to find reliable PC > hardware these days, in light of ever shorter and faster > product release > cycles. I have several hundred of the motherboard the poster is using, and it works reliably with MP operation with 4.X. The memtest86 that i sent him understands the ECC registers on the e7501 MCH, it should find all correctable and uncorrectable errors. --don
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