Re; 4KSTACKS again. Thanks...

[Sean Bruno]

Just for entertainment, maybe I can get a cross mailing list flame war
going, I poked around the Nvidia Linux Driver mailing list:
http://www.nvnews.net/vbulletin/showthread.php?t=27531

And posted a point or two(probably completely incorrect), please
contribute whatever you desire to this thread and maybe Nvidia will look
at it?


On Sun, 2004-04-18 at 11:31, Tom Mitchell wrote:
> Thanks,
> On Sat, Apr 17, 2004 at 06:23:02PM -0400, Alan Cox wrote:
> > On Sat, Apr 17, 2004 at 01:33:40PM -0700, Tom Mitchell wrote:
> > > I am curious why the change to 4K stacks was made.
> > > I assume from comments that it permits mapping an invalid page 
> > > to trap overflow errors.
> > 
> > You have a kernel stack per process. Thats a lot of memory. This stack is
> > used for syscall processing and also interrupts ocuring when that thread
> > runs. You may also get nested interrupts so the stack needs to be big
> > enough for a probable worst case, which means 4K or so alwayd free for
> > interrupts.
> > 
> > If you have 4K per process and seperate stacks per IRQ its more efficient
> > and more reliable.
> 
> Thank you.
> 
> -- 
> 	T o m  M i t c h e l l 
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Sean Bruno
Telecommunications Engineer
Metro One Telecommunications
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