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Date: Tue, 17 May 2022 16:35:15 -0300 From: Jason Gunthorpe <jgg@...pe.ca> To: Long Li <longli@...rosoft.com> Cc: KY Srinivasan <kys@...rosoft.com>, Haiyang Zhang <haiyangz@...rosoft.com>, Stephen Hemminger <sthemmin@...rosoft.com>, Wei Liu <wei.liu@...nel.org>, Dexuan Cui <decui@...rosoft.com>, "David S. Miller" <davem@...emloft.net>, Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, Leon Romanovsky <leon@...nel.org>, "linux-hyperv@...r.kernel.org" <linux-hyperv@...r.kernel.org>, "netdev@...r.kernel.org" <netdev@...r.kernel.org>, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, "linux-rdma@...r.kernel.org" <linux-rdma@...r.kernel.org> Subject: Re: [PATCH 05/12] net: mana: Set the DMA device max page size 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@...uxonhyperv.com wrote: > > > From: Long Li <longli@...rosoft.com> > > > > > > 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
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