On 3 January 2016 at 09:46, Robert Watson <rwat...@freebsd.org> wrote: > On Sun, 3 Jan 2016, Rui Paulo wrote: > >>> NetBSD 7.0 has just introduced these two syscalls. And Linux also has >>> them. >>> >>> Does FreeBSD have them? Or plan to support them in the future? >> >> >> FreeBSD does not have them. It doesn't seem especially hard to implement, >> though. Do you know any major application already using them? > > > I see no harm in having the system calls. When I chatted with the authors > of nsd a couple of years ago (they had originally promoted the approach), > they told me they felt it only offered incremental benefit and didn't > particularly recommend that FreeBSD adopt it. However, it would undoubtably > see use and does offer some opportunities for future batching-related > performance operations, so if someone wants to pursue introducing it, do go > ahead. Or just introduce a libc implementation that can be converted to a > kernel implementation later if that is determined to be beneficial. But the > nsd observations don't (currently) lead me to believe that it is critical to > do so.
There's a paper from Yahoo! from a while ago where they did, among other things, add this functionality (to linux.) It doesn't help at low connection rates. It helps at high connection / concurrency rates as the time going in/out of the kernel and getting back to steady state execution changes. I can't find the paper off-hand, but it is out there. I can benchmark it on my UDP RSS stuff and see if it helps at the highest connection rates. :) -adrian _______________________________________________ freebsd-net@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/freebsd-net To unsubscribe, send any mail to "freebsd-net-unsubscr...@freebsd.org"
