Messages in this thread | | | Date | Mon, 1 Nov 2004 12:02:45 +0100 (MET) | From | Mikael Pettersson <> | Subject | Re: unit-at-a-time... |
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On 01 Nov 2004 02:39:41 +0100, Andi Kleen wrote: >> Disabling unit-at-a-time for i386 is definitely correct. >> I've personally observed horrible runtime corruption bugs >> in early 2.6 kernels when they were compiled with gcc-3.4 >> without the -fno-unit-at-a-time fix. > >Maybe you got a buggy gcc version. The 2.6.5 based SLES9/i386 >kernel is shipping with -funit-at-a-time compiled with a 3.3-hammer >compiler and I am not aware of any reports of stack overflow >(and that kernel is extremly well tested)
It happened when I added perfctr to a 2.6.5-based SuSE kernel, and compiled the whole thing with gcc-3.4.0 (or 3.4.1, don't remember). Perfctr normally adds a little stack usage to the context-switch path, but gcc-3.4 made it much worse. Disabling unit-at-a-time solved the problem.
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