On Tue, May 17, 2022 at 07:32:51PM +0000, Long Li wrote: > > Subject: Re: [PATCH 05/12] net: mana: Set the DMA device max page size > > > > On Tue, May 17, 2022 at 02:04:29AM -0700, longli@xxxxxxxxxxxxxxxxx wrote: > > > From: Long Li <longli@xxxxxxxxxxxxx> > > > > > > The system chooses default 64K page size if the device does not > > > specify the max page size the device can handle for DMA. This do not > > > work well when device is registering large chunk of memory in that a > > > large page size is more efficient. > > > > > > Set it to the maximum hardware supported page size. > > > > For RDMA devices this should be set to the largest segment size an ib_sge can > > take in when posting work. It should not be the page size of MR. 2M is a weird > > number for that, are you sure it is right? > > Yes, this is the maximum page size used in hardware page tables. As I said, it should be the size of the sge in the WQE, not the "hardware page tables" Jason
