From mboxrd@z Thu Jan  1 00:00:00 1970
From: Or Gerlitz <ogerlitz-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
Subject: Re: linux rdma 3.14 merge plans
Date: Wed, 29 Jan 2014 18:34:34 +0200
Message-ID: <52E92D9A.70402@mellanox.com>
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To: Sagi Grimberg <sagig-LDSdmyG8hGV8YrgS2mwiifqBs+8SCbDb@public.gmane.org>, Bart Van Assche <bvanassche-HInyCGIudOg@public.gmane.org>, Or Gerlitz <or.gerlitz-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>, Roland Dreier <roland-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>, Hefty Sean <sean.hefty-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>, Sagi Grimberg <sagig-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
Cc: linux-rdma <linux-rdma-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>, Mike Christie <michaelc-hcNo3dDEHLuVc3sceRu5cw@public.gmane.org>, Oren Duer <oren-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
List-Id: linux-rdma@vger.kernel.org

On 29/01/2014 17:06, Sagi Grimberg wrote:
> Non-contiguous buffers are a well known problem/challenge for RDMA 
> transports, each handles them differently: iSER uses bounce buffers, 
> SRP registers multiple contiguous regions.

To be precise, we do it only on very special cases, normally the payload 
**each** SCSI command of size > PAGE_SIZE is scattered between random 
set of pages allocated by the kernel buffer cache and this set is mapped 
through fast-reg or fmr mechanism to one RDMA virtual address.

Or.
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