> Subject: Re: [PATCH for-rc] Revert "RDMA/efa: Use API to get contiguous
> memory blocks aligned to device supported page size"
>
> On 20/01/2020 16:10, Gal Pressman wrote:
> > The cited commit leads to register MR failures and random hangs when
> > running different MPI applications. The exact root cause for the issue
> > is still not clear, this revert brings us back to a stable state.
> >
> > This reverts commit 40ddb3f020834f9afb7aab31385994811f4db259.
> >
> > Fixes: 40ddb3f02083 ("RDMA/efa: Use API to get contiguous memory
> > blocks aligned to device supported page size")
> > Cc: Shiraz Saleem <shiraz.saleem@xxxxxxxxx>
> > Cc: stable@xxxxxxxxxxxxxxx # 5.3
> > Signed-off-by: Gal Pressman <galpress@xxxxxxxxxx>
>
> Shiraz, I think I found the root cause here.
> I'm noticing a register MR of size 32k, which is constructed from two sges, the first
> sge of size 12k and the second of 20k.
>
> ib_umem_find_best_pgsz returns page shift 13 in the following way:
>
> 0x103dcb2000 0x103dcb5000 0x103dd5d000 0x103dd62000
> +----------+ +------------------+
> | | | |
> | 12k | | 20k |
> +----------+ +------------------+
>
> +------+------+ +------+------+------+
> | | | | | | |
> | 8k | 8k | | 8k | 8k | 8k |
> +------+------+ +------+------+------+
> 0x103dcb2000 0x103dcb6000 0x103dd5c000 0x103dd62000
>
>
Gal - would be useful to know the IOVA (virt) and umem->addr also for this MR in ib_umem_find_best_pgsz
