Re: [Qemu-devel] KQEMU bus errors

[Darryl Dixon <esrever_otua@pythonhacker.is-a-geek.net>]

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Hi,

    I'm not convinced that this is actually the case.  I have tested
this on several machines now with several guest OSes and get the same
result on all of them (which all previously worked).  With the snapshot
from 2005-02-09 all works correctly.  With CVS from 2005-02-11 onwards I
get the error ('Bus error' on host for WinXP guest and 'Protection
Fault' inside guest for Win98 guest).  I think that perhaps with smaller
guest RAM size you are simply hiding the bug.  On one machine at least I
have 756MB physical RAM and 3GB swap allocated and get the same problem.
Most of the references that I can find for a Linux 'Bus error' talk
about unaligned memory accesses.  I did a diff of the 2005-02-09 tree
and the 2005-02-11 tree and noted that most of the *changes* (rather
than additions and new things) were relating to the way that memory is
handled and marked inside qemu.  I think that there is a chance that one
of these has introduced the problem.

Regards,
D

On Sun, 2005-02-13 at 09:14 +0400, Brad Campbell wrote:

> Hetz Ben Hamo wrote:
> > Yes, found the reason...
> > 
> > Test with different ram size - you'll be surprised...
> > 
> I second this one.
> I found I had to make sure my tmpfs "partition" was larger than my requested ram size. Problem went 
> away.
> 
> Brad

-- 
Darryl Dixon <esrever_otua@pythonhacker.is-a-geek.net>

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