Re: Fwd: [PATCH 1/1] RDMA/umem: add back hugepage sg list

[Jason Gunthorpe <jgg@nvidia.com>]

On Sun, Mar 21, 2021 at 04:06:07PM +0800, Zhu Yanjun wrote:
> > > > You are reporting 4k pages, if max_segment is larger than 4k there is
> > > > no such thing as "too big"
> > > >
> > > > I assume it is "too small" because of some maths overflow.
> > >
> > >  459                 while (n_pages && page_to_pfn(pages[0]) == paddr) {
> > >  460                         if (prv->length + PAGE_SIZE >
> > > max_segment)  <--it max_segment is big, n_pages is zero.
> >
> > What does n_pages have to do with max_segment?
> 
> With the following snippet
> "
>         struct ib_umem *region;
>         region = ib_umem_get(pd->device, start, len, access);
> 
>         page_size = ib_umem_find_best_pgsz(region,
>                                            SZ_4K | SZ_2M | SZ_1G,
>                                            virt);
> "

Can you please stop posting random bits of code that do nothing to
answer the question?

> IMHO, you can reproduce this problem in your local host.

Uh, no, you need to communicate effectively or stop posting please.

Jason