Hi:
This is a small and quick test program with intention to test the page
swapping or page
boundary handling or the StrongArm processor paging problem.
First, it allocates a large piece of memory (64 MB is used in the test
program) at the
beginning of the program and find the memory location of the first memory
page starting
point. This is what the line 27 modulo 4096 and line 28 are doing.
Then, it is in a loop to write first 32 bit data (32bit int) to the
beginning of the page and
write another 32 bit data starting at the two bytes before the page ends.
The second
32 bit data is written with intention to cause the page overflow for the
page boundary
handling testing. Repeats this process on every page until the allocated
memory
reaches to the end.
When I ran three processes of this test simultaneously, half of the chance
the test
processes (one, two or three) are hung and the OS is OK. And the rest of
time, the
OS is fully locked. Can not do anything to the system until the unit is
cold re-booted.
All the hang situations occur when all the tests reach to almost the end of
their
allocated memories. (So, I am sure it is not the large memory allocation
problem.)
With my understanding, an user program should not crash the system. So I
want to
see if there is any patches available for this problem or it is a known bug.
Regards,
Winnie
> -----Original Message-----
> From: Ron Bianco [SMTP:[EMAIL PROTECTED]]
> Sent: Monday, April 12, 1999 1:39 PM
> To: 'Winnie Wong'
> Subject: RE: NetWinder hung
>
> Hi Winnie,
>
> Don't have much time to analyze, but seems like some logic errors.
> A few thoughts:
>
> Line 27 - pointer to mem block modulo 4096? Why?
> Line 28 - confusing, not sure what you're trying to achieve.
> Line 36 - writing a 32 bit int at just 2 bytes from page boundary will
> overflow page boundary
>
> Cheers, Ron
>
> Ron Bianco
> Computer Systems Technologist
> Level Control Systems
> email: [EMAIL PROTECTED]
> phone: 250-549-2558 Ext 8 or 3
> web: http://www.lcsaudio.com
>
> On Friday, April 09, 1999 11:20 AM, Winnie Wong wrote:
> > Hi all;
> >
> > I have a NetWinder with kernel V2.2.1. I am simultaneously running
> three
> > copies of a test program which is attached at the end of this e-mail.
> When
> > the first one finishes, the second one has a Bus Error and the third one
> > hung. I checked the console, it is also hung. Telnet to it, no
> response,
> > but ping is ok.
> >
> > Does anyone know what is wrong with it? Any patches available?
> >
> > Thanks in advance,
> >
> >
> > Winnie
> >
> > Attached fiile is following:
> >
> > <<pagetest.c>>
> > << File: pagetest.c >>
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