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Re: [Qemu-devel] [PATCHv2] rdma: add a new IB_ACCESS_GIFT flag
From: |
Michael S. Tsirkin |
Subject: |
Re: [Qemu-devel] [PATCHv2] rdma: add a new IB_ACCESS_GIFT flag |
Date: |
Tue, 9 Apr 2013 22:12:18 +0300 |
On Fri, Apr 05, 2013 at 01:43:49PM -0700, Roland Dreier wrote:
> On Fri, Apr 5, 2013 at 1:17 PM, Michael R. Hines
> <address@hidden> wrote:
> > 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).
>
> Not sure I'm interpreting this correctly. Are you saying that things
> worked without actually setting the GIFT flag? In which case why are
> we adding this flag?
>
> - R.
We are adding the flag to reduce memory when there's lots of COW pages.
There's no guarantee there will be COW pages so I expect things to work
both with and without breaking COW, just using much more memory when we
break COW.
--
MST
- Re: [Qemu-devel] [PATCHv2] rdma: add a new IB_ACCESS_GIFT flag, (continued)
- Re: [Qemu-devel] [PATCHv2] rdma: add a new IB_ACCESS_GIFT flag, Michael R. Hines, 2013/04/05
- Re: [Qemu-devel] [PATCHv2] rdma: add a new IB_ACCESS_GIFT flag, Michael S. Tsirkin, 2013/04/09
- Re: [Qemu-devel] [PATCHv2] rdma: add a new IB_ACCESS_GIFT flag, Michael R. Hines, 2013/04/09
- Re: [Qemu-devel] [PATCHv2] rdma: add a new IB_ACCESS_GIFT flag, Michael S. Tsirkin, 2013/04/09
- Re: [Qemu-devel] [PATCHv2] rdma: add a new IB_ACCESS_GIFT flag,
Michael S. Tsirkin <=
Re: [Qemu-devel] [PATCHv2] rdma: add a new IB_ACCESS_GIFT flag, Michael S. Tsirkin, 2013/04/09