linux-kernel - Re: [PATCHv2] rdma: add a new IB_ACCESS

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Message-ID: <20130409203409.GA9246@redhat.com>
Date:	Tue, 9 Apr 2013 23:34:09 +0300
From:	"Michael S. Tsirkin" <mst@...hat.com>
To:	"Michael R. Hines" <mrhines@...ux.vnet.ibm.com>
Cc:	Roland Dreier <roland@...nel.org>,
	Jason Gunthorpe <jgunthorpe@...idianresearch.com>,
	Sean Hefty <sean.hefty@...el.com>,
	Hal Rosenstock <hal.rosenstock@...il.com>,
	Yishai Hadas <yishaih@...lanox.com>,
	Christoph Lameter <cl@...ux.com>,
	"linux-rdma@...r.kernel.org" <linux-rdma@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>, qemu-devel@...gnu.org
Subject: Re: [PATCHv2] rdma: add a new IB_ACCESS_GIFT flag

On Fri, Apr 05, 2013 at 04:17:36PM -0400, Michael R. Hines wrote:
> The userland part of the patch was missing (IBV_ACCESS_GIFT).
> 
> I added flag that to /usr/include in addition to this patch and did
> a test RDMA migrate and it seems to work without any problems.
> 
> I also removed the IBV_*_WRITE flags on the sender-side and
> activated cgroups with the "memory.memsw.limit_in_bytes" activated
> and the migration with RDMA also succeeded without any problems
> (both with *and* without GIFT also worked).
> 
> Any additional tests you would like?
> 
> 
> - Michael

RDMA can't really work with swap so not sure how that's relevant.

Please check memory.usage_in_bytes - is it lower with
the GIFT flag?  I think this is what we really care about.

-- 
MST
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