Re: Kernel Oops allocating DMA buffer in video1394

Hi Johann,

On Wed, 2004-02-11 at 18:39, Johann Schoonees wrote:
> In practice, I get a segmentation fault when I ask for more than 86 x
> 307200 = 26.4 MB (approximately, because the buffer size gets adjusted
> to page boundaries somewhere). This number does not change when I reboot.

[snip]

> My OS is Red Hat Fedora Core 1 which has kernel version
> 2.4.22-1.2115.nptl. I use a recent (Feb 2004) libdc1394 CVS.
>
> Matching up the kernel error messages above with the code in
> video1394.c, it seems it got as far as the "Failed to allocate dma
> buffer" message before the kernel oops stepped in. Otherwise there
> would have been further messages from video1394 itself about being
> unable to establish ir context.
>
> Anyone come across this one before?

I can across this bug in June 2003. IIRC I reported it. The error I had
(and still have with 2.6.2) is the same as yours: system hang when the
total allocated DMA buffer size is over +/- 26MB

Damien

-- 
  _    Damien Douxchamps
 (°-   PhD Student / Research Assistant
 //\   Image Processing Group, Telecom Laboratory, UCL, Belgium
 V_/_  http://www.tele.ucl.ac.be/MEMBERS/Douxchamps_Damien_e.html
-------------------------------------------------------
SF.Net is sponsored by: Speed Start Your Linux Apps Now.
Build and deploy apps & Web services for Linux with
a free DVD software kit from IBM. Click Now!
http://ads.osdn.com/?ad_id56&alloc_id438&op%cck
_______________________________________________
mailing list Linux1394-user@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/linux1394-user