[openib-general] Re: [PATCH] enable the fmr pool user to set the pagesize

[Michael S. Tsirkin]

Quoting Or Gerlitz <ogerlitz at voltaire.com>:
> Second and indeed more important, from our experience, there are 
> eventually IB consumers such as the Linux SCSI Mid-Layer which sometimes 
> generate Scatter-Gather lists that are "RDMA aligned" when treated in a 
> resolution different from the system PAGE_SHIFT. Example to that we saw 
> with ia64 SLES9 SP1/2 kernels. So if you work in PAGE_SHIFT you can not 
> produce one VA for many of the SG submitted by the mid-layer.

Interesting. Where does the mid-layer get the 4K (not PAGE_SIZE) aligned
buffers?  Any idea?


-- 
MST