In sys/conf/kern.mk, there is a comment about not aligning
the (x86) stack to 16-byte boundaries, and it overrides the
preferred-stack-boundary to 2.
.if ${MACHINE_ARCH} == "i386"
CFLAGS+= -mno-align-long-strings -mpreferred-stack-boundary=2
.endif
This seems to be contradicted by intel's optimisation guide
for the P4/XEON family.
It seems that the performance is best by making it 4, even for
older chips.
Is there any hidden pitfall to changing this value? I compiled
a kernel, and all seems to run ok.
--don ([EMAIL PROTECTED] www.sandvine.com)
To Unsubscribe: send mail to [EMAIL PROTECTED]
with "unsubscribe freebsd-hackers" in the body of the message
