Date: Mon, 3 Mar 2008 10:16:43 +0900 From: Pyun YongHyeon <pyunyh@gmail.com> To: Kurt Jaeger <lists@c0mplx.org> Cc: freebsd-stable@freebsd.org Subject: Re: PAUSE support for Ethernet interfaces ? Message-ID: <20080303011643.GD72895@cdnetworks.co.kr> In-Reply-To: <20080229104107.GA31985@home.opsec.eu> References: <20080229104107.GA31985@home.opsec.eu>
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On Fri, Feb 29, 2008 at 11:41:07AM +0100, Kurt Jaeger wrote: > Hi! > > I'm researching the topic of PAUSE counters (receiving side) for > FreeBSD systems. > > That's a sort of flow control with ethernet, see e.g.: > > http://www.techfest.com/networking/lan/ethernet3.htm#3.2.1 > > Cisco switches seem to receive and count them, which helps > to find short-term (seconds) overloaded links. FreeBSD has no such framework in mii layer yet so it's completely up to driver. em(4) handles flow-control in driver so it can handle flow-control. > Can FreeBSD 6.x or 7.x handle PAUSE frames, at least receiving them ? > Receiving pause frames have no problem on any driver but most drivers does not respond with the pause frames. AFAIK marius@ has a flow-control patch so I guess FreeBSD will have generic flow-control capability which will make it available on all ethernet drivers with minor modification. > Thanks for any pointer! > -- Regards, Pyun YongHyeon
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