Garrett Wollman writes: > <<On Wed, 12 Oct 2005 17:17:12 -0400 (EDT), Andrew Gallatin <[EMAIL > PROTECTED]> said: > > > Right now, at least, it seems to work OK. I haven't tried witness, > > but a non-debug kernel shows a big speedup from enabling it. Do > > you think there is a chance that it could be made to work in FreeBSD? > > I did this ten years ago for a previous job and was able to blow out > the stack very easily.
I haven't blown it out yet, but for that and other reasons, it seems to be a bigger can of worms than it would be worth. The interesting thing is that using the TSC timecounter rather than ACPI-fast reduces the context switch latency enough so as to make the TCP latency 25us when using a netisr thread. 25us is identical to what I saw with the direct dispatch loopback hack. Linux already takes care of syncing the TSC between SMP cpus, so we know it is possible. This seems like a much more doable optimization. And it is likely to have other benefits.. Drew _______________________________________________ freebsd-net@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-net To unsubscribe, send any mail to "[EMAIL PROTECTED]"
