Hi Roland/Michael, One of my coworkers in Champaign is seeing a performance issue with the latest SVN driver and the OFED 1.1 Mellanox driver on certain platforms.
On the older SVN somewhere around 7500 the Mellanox driver did not save and restore certain PCI registers before a reset. Somewhere around SVN 8000 a patch was added to save and restore these registers. However on our Alcolu platform this patch causes the MaxReadReq to be set to 128 bytes (rather than 512) which limits bandwith to 650MBytes/sec. If I remove the save/restore of these registers (attached patch), the bandwidth is back to where we would expect it 1250 Mbytes/sec. Is there some problem with this patch or do you think it is some BIOS issue in the platform ? woody
pci_regs.patch
Description: pci_regs.patch
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