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SubjectRe: [PATCH][RFC] 4K stacks default, not a debug thing any more...?
On Tue, 2007-07-17 at 10:45 -0400, John Stoffel wrote:
> utz> I have to recompile the fedora kernel rpms (fc6, f7) with 8k
> utz> stacks on my i686 server. It's using NFS -> XFS -> DM -> MD
> utz> (raid1) -> IDE disks. With 4k stacks it crash (hang) within
> utz> minutes after using NFS. With 8k stacks it's rock solid. No
> utz> crashes within months.
> Does it give any useful information when it does crash?
No, sorry. Nearly always it lock up so hard that even sysrq didn't work
anymore. Most times the console was blanked. If not, there was a line
with "do_irq" or something like that (if i remember correctly).
A few times it continuous oopsing (scrolling like mad).

I think it's just a stack overflow. Knowing that XFS + long IO stack
have problems with 4k stacks. And i have zero crashes with the
recompiled 8k stack kernels. (All kernel are the fedora ones).

Btw: In the past the server runs on slightly different hardware and
without raid1 (NFS -> XFS -> DM -> IDE disk). It runs with 4k stacks. I
had a few crashes, but i blame the hardware for it.

I don't want to make tests with the server. It's my main data storage
and i don't want to risk it.

> Can you make
> a simple test case using ram disks instead of IDE disks and then
> building upon that?

Sorry, i don't think i can do this. My other computer, which i can use
for tests, is x86_64 based.
And IFAIK the problem on the XFS side has something to do with looking
for freespace on many AGs. So maybe a bigger and filled filesystem is
needed. And 50GB ram disks are out of question.


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