Re: [PATCH v1] RDMA/rxe: Bump up default maximum values used via uverbs

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On Tue, Sep 28, 2021 at 12:38 PM Shoaib Rao <rao.shoaib@xxxxxxxxxx> wrote:
>
>
> On 9/27/21 6:46 PM, Zhu Yanjun wrote:
> > On Tue, Sep 28, 2021 at 3:19 AM Jason Gunthorpe <jgg@xxxxxxxxxx> wrote:
> >> On Tue, Sep 14, 2021 at 06:12:20PM -0700, Rao Shoaib wrote:
> >>> In our internal testing we have found that
> >>> default maximum values are too small.
> >>> Ideally there should be no limits, but since
> >>> maximum values are reported via ibv_query_device,
> >>> we have to return some value. So, the default
> >>> maximums have been changed to large values.
> >>>
> >>> Signed-off-by: Rao Shoaib <Rao.Shoaib@xxxxxxxxxx>
> >>> ---
> >>>
> >>> Resubmitting the patch after applying Bob's latest patches and testing
> >>> using via rping.
> >>>
> >>>   drivers/infiniband/sw/rxe/rxe_param.h | 30 ++++++++++++++-------------
> >>>   1 file changed, 16 insertions(+), 14 deletions(-)
> >> So are we good with this? Bob? Zhu?
> > I have already checked this commit. And I have found 2 problems with
> > this commit.
> > This commit changes many MAXs.
> > And now rxe is not stable enough. Not sure this commit will cause the
> > new problems.
> >
> > Zhu Yanjun
>
> Hi Zhu,
>
> A generic statement without any technical data does not help. As far as
> I am aware, currently there are no outstanding issues. If there are,
> please provide data that clearly shows that the issue is caused by this
> patch.

Hi, Shoaib

With this commit, I found 2 problems.
This is why I suspect that this commit will introduce risks.

Before a commit is sent to the upstream, please make full tests with it.

Zhu Yanjun

>
> Thanks you.
>
> Shoaib
>
> >>> -     RXE_MAX_MR_INDEX                = 0x00010000,
> >>> +     RXE_MAX_MR_INDEX                = DEFAULT_MAX_VALUE,
> >>> +     RXE_MAX_MR                      = DEFAULT_MAX_VALUE - RXE_MIN_MR_INDEX,
> >> Bob, were you saying this was what needed to be bigger to pass
> >> blktests??
> >>
> >> Jason



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