Re: [PATCH 2/2] IB/iser: set max_segment_size

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On Tue, 2016-04-12 at 13:48 +0300, Sagi Grimberg wrote:
> > So that we don't overflow the number of MR segments allocated
> > because
> > we have to split on SGL segment into multiple MR segments.
> > 
> > Signed-off-by: Christoph Hellwig <hch@xxxxxx>
> > ---
> >   drivers/infiniband/ulp/iser/iscsi_iser.c | 1 +
> >   1 file changed, 1 insertion(+)
> > 
> > diff --git a/drivers/infiniband/ulp/iser/iscsi_iser.c
> > b/drivers/infiniband/ulp/iser/iscsi_iser.c
> > index 80b6bed..784504a 100644
> > --- a/drivers/infiniband/ulp/iser/iscsi_iser.c
> > +++ b/drivers/infiniband/ulp/iser/iscsi_iser.c
> > @@ -623,6 +623,7 @@ iscsi_iser_session_create(struct iscsi_endpoint
> > *ep,
> >   	shost->max_id = 0;
> >   	shost->max_channel = 0;
> >   	shost->max_cmd_len = 16;
> > +	shost->max_segment_size = PAGE_SIZE;
> 
> In iser we sorta rely on 4k pages so we avoid
> PAGE_SIZE but rather set SIZE_4K for these sort
> of things (like we did in the virt_boundary).

So you still want only 4k segments even on PPC where the PAGE_SIZE is
16k?

James


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