On Feb 12, 2008 12:17 PM, Robin Humble <robin.humble+stgt at anu.edu.au> wrote: > > are you loading mthca with > options ib_mthca tune_pci=1 > so that lspci -vvv says: > MaxReadReq 4096 bytes An even better way than specifying tune_pci=1 is to perform a BIOS upgrade. On an Intel S5000PAL this increased MaxReadReq from 128 to 512 bytes, which is enough to obtain maximal throughput on an SDR 4x IB network. Bart Van Assche. |