On Sat, Dec 12, 2009 at 10:40 AM, Patrick Geoffray <patr...@myri.com> wrote: > > Most 10GE NIC have no problems reaching line rate at 1500 Bytes (the > standard Ethernet MTU), the problem is the host OS stack (mainly TCP) where > the per-packet overhead is important. One trick that all 10GE NICs worth > their salt are doing these days is to fake a large MTU at the OS level, > while keeping the wire MTU at 1500 Bytes (for compatibility). This is called > TSO (Transmit Send Offload) and LRO (Large Receive Offload). The OS stack is > using a virtual MTU of 64K and the NIC does segmentation/reassembly in > hardware, sort of.
The TSO and LRO are only relevant to TCP though, aren't they? I am using RDMA so that shouldn't matter. Maybe I am wrong. -- Rahul _______________________________________________ Beowulf mailing list, Beowulf@beowulf.org sponsored by Penguin Computing To change your subscription (digest mode or unsubscribe) visit http://www.beowulf.org/mailman/listinfo/beowulf
