On Thu, May 26, 2011 at 12:46:20AM +0300, Or Gerlitz wrote: > > I mean is there anyone who really uses >4 VLs? ?Presumably the > > HW designers didn't think so, because they limited HW to 4 VLs with 4K MTU. > > I'm not sure if 4 VLs are enough for all the topologies / algorithms I > mentioned above, so I do prefer to leave an option to run with eight > VLs. As for the HW designers comment, its always good to look > forward
Routing algorithms only need VLs on interswitch links, not on HCA to switch links. The only use of the HCA to switch VLs is for QoS. Mesh topologies can usually be routed with only two VLs, but you need alot of SLs to make that work. IMHO it would be much nicer if the SM could control and set this choice, but since the spec doesn't have a provision for this I'm not sure what to suggest there.. Jason -- To unsubscribe from this list: send the line "unsubscribe linux-rdma" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
