Adding: Options ib_mthca tune_pci=1 Puts MaxReadReq = 4096.
I get 1250MB/s bandwidth. -- Peter -----Original Message----- From: Woodruff, Robert J Sent: Monday, October 02, 2006 3:51 PM To: Roland Dreier; Hartman, Peter Cc: Michael S. Tsirkin; openib-general; EWG; Hartman, Peter Subject: RE: Drop in performance on Mellanox MT25204 single port DDR HCA Roland wrote, >However tune_pci=1 will make the driver override this setting if you >really know what you're doing. > - R. Peter, can you give this a try ? I think you set this in /etc/modprobe.conf add the line, options mthca tune_pci=1 Also, we need to understand why the BIOS in your platform is setting it to 128 rather than 512. Is this an oversight in the BIOS or are they doing it for a reason. woody _______________________________________________ openib-general mailing list openib-general@openib.org http://openib.org/mailman/listinfo/openib-general To unsubscribe, please visit http://openib.org/mailman/listinfo/openib-general