Re: kern/59719 Re: 4.9 Stable Crashes on SuperMicro with SMP

From: Uwe Doering (gemini_at_geminix.org)
Date: 11/29/03

  • Next message: Michael Nottebrock: "Re: Time jumping on both 4.x and 5.x ..." 
    Date: Sat, 29 Nov 2003 09:28:06 +0100
To: freebsd-gnats-submit@FreeBSD.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.

        Uwe 

    -- 
Uwe Doering         |  EscapeBox - Managed On-Demand UNIX Servers
gemini@geminix.org  |  http://www.escapebox.net
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  • Next message: Michael Nottebrock: "Re: Time jumping on both 4.x and 5.x ..."

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