Messages in this thread | | | From | Andreas Dilger <> | Date | Wed, 2 Oct 2002 15:56:49 -0600 | Subject | Re: [RFC][PATCH] 4KB stack + irq stack for x86 |
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On Oct 02, 2002 14:18 -0700, Dave Hansen wrote: > I've resynced Ben's patch against 2.5.40. However, I'm getting some > strange failures. The patch is good enough to pass LTP, but > consistently freezes when I run tcpdump on it. > > Although I don't have CONFIG_PREEMPT on, I have the feeling that I > need to disable preemption in common_interrupt() like it was before. > Any insights would be appreciated.
I'm a little bit worried about this patch. Have you tried something like NFS-over-ext3-over-LVM-over-MD or so, which can have a deep stack?
We hit a bunch of deep stack problems like this (overflowing an 8kB stack) even without interrupts involved when developing Lustre. Granted, we fixed some large stack allocations in the ext3 indexed-directory code and in our own code, but I'm still worried that a 4kB stack is too small.
The Stanford checker folks would probably be able to run a test for large stack allocations in 2.5.40 if you asked them nicely, and maybe even do stack depths for call chains.
Alternately, you could set up an 8kB stack + IRQ stack and "red-zone" the high page of the current 8kB stack and see if it is ever used.
Cheers, Andreas -- Andreas Dilger http://www-mddsp.enel.ucalgary.ca/People/adilger/ http://sourceforge.net/projects/ext2resize/
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