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Re: [Qemu-devel] [PATCHv2] rdma: add a new IB_ACCESS_GIFT flag


From: Michael R. Hines
Subject: Re: [Qemu-devel] [PATCHv2] rdma: add a new IB_ACCESS_GIFT flag
Date: Fri, 05 Apr 2013 16:51:20 -0400
User-agent: Mozilla/5.0 (X11; Linux i686; rv:17.0) Gecko/20130106 Thunderbird/17.0.2

Sorry, I was wrong. ignore the comments about cgroups. That's still broken. (i.e. trying to register RDMA memory while using a cgroup swap limit cause the process get killed).

But the GIFT flag patch works (my understanding is that GIFT flag allows the adapter to transmit stale memory information, it does not have anything to do with cgroups specifically).

Am I missing something? I was only testing the GIFT flag patch.

Note: I only turned it on - I did not verify the (non) consitency of the memory that was transmitted.

- Michael


On 04/05/2013 04:43 PM, 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.





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