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Message-ID: <20080302104650.GC3861@ucw.cz> Date: Sun, 2 Mar 2008 11:46:50 +0100 From: Pavel Machek <pavel@....cz> To: Lukas Razik <linux@...ik.name> Cc: linux-kernel@...r.kernel.org Subject: Re: Ethernet over Kernel Sockets On Fri 2008-02-29 21:54:21, Lukas Razik wrote: > Hello all! > > As you know, some network cards doesn't have a 'eth' > interface under linux. > Because of that I'm developing a net_device based driver > which doesn't transmit and receive directly through a > real network card but through UDP kernel sockets. What is it good for? > So the eth1 interfaces are based on sockets which use > the eth0 (Gigabit) interfaces for the communication. > Now, if I measure the transmission between 192.168.0.1 > and 192.168.0.2 then I get transmission rates that are > normal for Gigabit-Ethernet (~25?sec (PingPong) and > ~900Mbit/s). > If I measure the transmission through the eth1 > interfaces between 192.168.1.1 and 192.168.1.2 then I > only get ~1msec (PingPong) and only about ~400Mbit/s. > > The interesting thing is, that I always get PingPongs of > 1ms (= one jiffie). Although if I measure with 100MBit- > or other non-Ethernet cards. Try increasing HZ :-)... or maybe it is a gigabit interrupt mitigation issue? -- (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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