Re: Linux SMP kernel bug with > 512M ram

From: jeff@AmeriCom.com
Date: Fri Sep 06 2002 - 16:49:54 EST


Its a VIA motherboard, and I found the problem:
https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=47160
Thanks for the help.

Regards,

Jeffrey Moss
jeff@americom.com

> Message-ID: <005a01c255ec$89be7b40$d281f6cc@WEASEL>
> From: "Steve Wolfe" <nw@codon.com>
> To: <jeff@AmeriCom.com>
> References: <fa.hqf5vev.1u6g19e@ifi.uio.no> <fa.hqeru5v.1v6u3h8@ifi.uio.no>
> Subject: Re: Linux SMP kernel bug with > 512M ram
> Date: Fri, 6 Sep 2002 15:29:29 -0600
> MIME-Version: 1.0
>
>

>
> > I don't think its chipset or memory, the machines that crash have
> different brand
> > motherboards with different chipsets, I ran docmem for 24 hours on each
> stick of ram
> > and found no errors. The ram worked fine in my WindowsXP machine, and it
> works fine
> > when I use the non-smp kernel, and/or when I take the ram down to 2
> sticks (512
> > meg). I'm posting here because I believe I have narrowed it down to a
> bug in the
> > kernel.
>
> I've also been bit in the rear-end by memory bugs, and I can assure
> you, they can be devilish to find. First, rather than running a memory
> test on each individual stick, you MUST run the memory test on the actual
> system, with the actual RAM. Often times, weird, bizarre errors crop up
> in certain combinations and not in others.
>
> It's also a little difficult to convince people that it's a bug in the
> kernel, when there is an incredibly number of people who run SMP kernels
> with >512 MB. I maintain a decent number of such machines, and have seen
> absolutely *zero* problems of similar natures that weren't traced back to
> defective or incompatible hardware.
>
> I'm curious - what kinds of motherboards are you using, and what kinds
> of RAM? What kind of memory timings are specified in the BIOS?
>
> steve
>
>

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