[mdlug] Laptop woes - Knoppix boots but Ubuntu doesn't?

[Aaron Kulkis]

Ingles, Raymond wrote:
>> From: Aaron Kulkis
> 
>> Ingles, Raymond wrote:
>>> It got 40% through one pass last night, forgot to mention before.
> I'll let
>> it run a full pass, but in my experience with dodgy RAM, if there's a
> problem
>> it's usually found pretty quickly.
> 
>> You mean like at booting up....
> 
>  More or less - I mean the memory testing program. In my experience, if
> memtest86+ is going to find a RAM error at all, it finds it in less than
> a minute. I still try to find time to run at least one full pass, but if
> I'm in a hurry I'll let it run for a little while to see if it finds any
> gross, obvious RAM problems.

Not always.  I've had memory errors that didn't show up until
70% of memtest86+'s tests were performed.

If you look at all the ways that memory can be bad, you'll
understand why memtest86+ does more than just 3 or 4 passes
through the memory.  Each test is checking for a different
kind of flaw. (For example, the rotating 1's and rotating
0's tests for flaws in which the same bit from two adjacent
memory locations are short-circuited together.  If you just
write 0xAA and 0x55 to each memory address, you can find out
if adjacent bits in the SAME memory address are shorted
together, but you won't find out if say, bit 3 of memory
locations X and X-1 are shorted together).



> 
>  Sincerely,
> 
>  Ray Ingles                                       (313) 227-2317
> 
>  If George Bush thinks "gay marriage" is such a big deal that he
>  needs to muck with our Constitution, why didn't he push for it
>              to be written into Iraq's new one?
> 
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