Hello, There is this comment in apicvar.h in the amd64 tree that talks about why the kernel uses smp_ipi_mtx and how it prevents more than 2 outstanding IPIs per interrupt vector. It appears that modern CPUs collapse the IRR bit if there is an interrupt when both the IRR and ISR bits are set. I was wondering why we need smp_ipi_mtx besides the fact that the kernel uses global variables for things like invalidate page ranges.
Thanks, Ravi _______________________________________________ freebsd-hackers@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-hackers To unsubscribe, send any mail to "[EMAIL PROTECTED]"
