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    SubjectRE: [PATCH 05/12] net: mana: Set the DMA device max page size
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    > 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@linuxonhyperv.com wrote:
    > > From: Long Li <longli@microsoft.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.

    Long

    >
    > Jason

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