Messages in this thread | | | Date | Sun, 2 Mar 2008 11:46:50 +0100 | From | Pavel Machek <> | Subject | Re: Ethernet over Kernel Sockets |
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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
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