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uraes
Tux's lil' helper
Tux's lil' helper


Joined: 28 Nov 2002
Posts: 110
Location: Estonia

PostPosted: Thu Dec 07, 2006 11:26 am    Post subject: High Memory Support -> system unstable Reply with quote

Hi,

I added to my pc new RAM (was 256M+256M+256M, now 500M+500M+1G).
with (almost) default configuration kernel it sees total mem about 1G.

Then, in kernel configuration switched "Processor type and features" -> "High Memory Support" to 4GB and voila - kernel saw all memory, but...
.. then turned out that almost _everything_ became unstable. KDE crashed in random places, runlevel scripts made segmentation faults (randomly! different boot times gave faults in different places), I was unable to compile new kernel because compiling failed due "illegal instruction" etc etc.. I think there is no point to try write down all those errors.. problem should be in kernel.
(Now working with same kernel only "High Memory Support" switched off and everything ok again)

Kernel: 2.6.17-gentoo-r8, tried also linux-2.6.18-gentoo-r3
Processor: Pentium 4

ps. did also memtest - memory is fine and kicking.

Can somebody say smth?
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frostschutz
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Advocate


Joined: 22 Feb 2005
Posts: 2458
Location: Germany

PostPosted: Thu Dec 07, 2006 12:28 pm    Post subject: Re: High Memory Support -> system unstable Reply with quote

uraes wrote:
ps. did also memtest - memory is fine and kicking.


It sometimes takes memtest hours or even days to find an error. Your description sounds like a bad ram problem. The kernel should not cause random lockups by itself.
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batistuta
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Joined: 29 Jul 2005
Posts: 1384
Location: Aachen

PostPosted: Thu Dec 07, 2006 12:36 pm    Post subject: Reply with quote

quality of no-name memory vendors varies widely. Is yours from a known vendor or bulk? I tend to agree with frostschutz, it sounds like a RAM issue. You might also try a bit less aggressive timings in your BIOS, to see if that easies the issue.
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uraes
Tux's lil' helper
Tux's lil' helper


Joined: 28 Nov 2002
Posts: 110
Location: Estonia

PostPosted: Fri Dec 08, 2006 12:58 pm    Post subject: Reply with quote

eh, you were right!

left memtest to run for whole night, and in the morning there were pretty sad results.
Now waiting for a new chip.

Thanks!
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