Vic: I'm told (by someone who knows duct tape) that Hipersockets Guest LANs perform better than QDIO Guest LANs, largely because the former are synchronous and the latter are asynchronous. However, I don't believe the differences are enough to worry about, particularly if (as you say) broadcast is a consideration.
Romney On Fri, 21 Jun 2002 10:27:51 +1000 Vic Cross said: >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 >>
