svn commit: r198451 - head/sys/ia64/include
Robert Watson
rwatson at FreeBSD.org
Sat Oct 24 23:14:18 UTC 2009
On Sat, 24 Oct 2009, Marcel Moolenaar wrote:
> Log:
> A 32KB kernel stack is not quite enough. The new USB stack is a bit
> more stack hungry as compared to the old one that my RX2660 gets
> a machine check and spontaneously reboots at the time the USB DVD
> drive is found and attached to CAM as a mass storage device. This
> doesn't happen always, but definitely varies per kernel build.
> Likewise when using a 128-byte printf buffer. The additional 128
> bytes that printf needs seems to be enough to have the memory stack
> and register stack collide and causing a machine check.
I recently noticed, somewhat to my surprise, that BPF drops a 512-byte buffer
on the stack while running filters...
Robert
>
> Thus: Bump KSTACK_PAGES from 4 to 5.
>
> Modified:
> head/sys/ia64/include/param.h
>
> Modified: head/sys/ia64/include/param.h
> ==============================================================================
> --- head/sys/ia64/include/param.h Sat Oct 24 20:07:17 2009 (r198450)
> +++ head/sys/ia64/include/param.h Sat Oct 24 20:28:42 2009 (r198451)
> @@ -92,7 +92,7 @@
> #define MAXPAGESIZES 1 /* maximum number of supported page sizes */
>
> #ifndef KSTACK_PAGES
> -#define KSTACK_PAGES 4 /* pages of kernel stack */
> +#define KSTACK_PAGES 5 /* pages of kernel stack */
> #endif
> #define KSTACK_GUARD_PAGES 0 /* pages of kstack guard; 0 disables */
>
>
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