svn commit: r198451 - head/sys/ia64/include

[M. Warner Losh]

In message: <alpine.BSF.2.00.0910250012410.68490 at fledge.watson.org>
            Robert Watson <rwatson at FreeBSD.org> writes:
: 
: 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...

Would another pass of huge stack function scrubbing be useful?

Warner