Date: Tue, 01 Dec 2009 12:47:30 -0800 From: Julian Elischer <julian@elischer.org> To: Brett Glass <brett@lariat.net> Cc: net@freebsd.org Subject: Re: Question regarding netgraph and threading Message-ID: <4B1580E2.4080006@elischer.org> In-Reply-To: <200912011952.MAA12927@lariat.net> References: <200912011952.MAA12927@lariat.net>
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Brett Glass wrote: > All: > > I have several large PPTP servers which are currently using ppp(8) and > PoPTop (a userland PPTP server daemon which is, unfortunately, GPLed). > They're having trouble under heavy loads, and so I'd like to switch to > mpd5. However, even though mpd5 handles network connections in the > kernel, via netgraph, I am worried about performance. > > As far as I can see, all netgraph operations are performed by a single > kernel thread named "ng_queue", while ppp(8) and PoPToP use many > processes and thus can distribute their work among multiple CPU cores. > > Is netgraph able to multithread, or is there a way to make it do so? well, not all work is done by that thread. It is the backup-doer-of-things, but many netgraph operations are done in the context of a caller such as teh user of a socket. netgraph is more efficient than the user layer however because it doesn't have to cross the kernel boundary to process the work. why not just try it? > > --Brett Glass > > _______________________________________________ > freebsd-net@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-net > To unsubscribe, send any mail to "freebsd-net-unsubscribe@freebsd.org"
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