Gaurav Batra <gba...@linux.vnet.ibm.com> writes: > Hello Michael, > > I was looking into the Bug: 199106 > (https://bugzilla.linux.ibm.com/show_bug.cgi?id=199106). > > In the Bug, Mellanox driver was timing out when enabling SRIOV device. > > I tested, Alexey's patch and it fixes the issue with Mellanox driver. > The down side > > to Alexey's fix is that even a small memory request by the driver will > be aligned up > > to 2MB. In my test, the Mellanox driver is issuing multiple requests of > 64K size. > > All these will get aligned up to 2MB, which is quite a waste of resources.
OK. I guess we should use your patch then. It's not ideal as it means the device can potentially read/write to memory it shouldn't, but 2MB is a lot to waste for a 64K alloc. > In any case, both the patches work. Let me know which approach you > prefer. In case > > we decide to go with my patch, I just realized that I need to fix > nio_pages in > > iommu_free_coherent() as well. Can you send a v3 with that fixed please. cheers
