Phil, type=qdio is the new QDIO Guest LAN that emulates a 'real' LAN, including broadcast support. To Linux it looks like an OSA-Express in QDIO mode.
type=hiper is the original Guest LAN based on the Hipersockets microcode of the zSeries. Which one you use is likely to depend on the type of application you run -- specifically, whether you need broadcast support. Just for getting connectivity between Penguins and a z/VM TCPIP it should not matter greatly which one you use. I'm not aware of performance differences. Cheers, Vic Cross ----- Original Message ----- From: "Philip J. Tully" <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Sent: Friday, June 21, 2002 12:42 AM Subject: Question on HIPERS vs QDIO > Cross posted to VMESA-L and Linux-390 lists > > Hello all, > > I just created an LPAR for development of Linux/390 applications. We > have installed z/VM 4.3. > Now VLANs can be created as either type=hiper or type=qdio. > I was wondering which definition should be used for communication > amongst linux guests and the VM Tcpip stack? > Are there performance differences between the 2? > Are there functional differences now that Hiper supports multicast? > > regards > Phil Tully >
