> On Jun 8, 2016, at 1:40 PM, Jason Gunthorpe <jgunthorpe@xxxxxxxxxxxxxxxxxxxx> wrote:
>
> On Wed, Jun 08, 2016 at 03:06:56PM +0000, Trond Myklebust wrote:
>
>> That would be a mount parameter which would only apply to RDMA since
>> everything else uses dynamic slot allocation these days. Iād prefer to
>> avoid that.
>
> The only reason RDMA cannot allocate MRs on the fly is
> performance.. Maybe a dynamic scheme is the right answer..
Dynamically managing the MR free list should be straightforward:
1. Allocate a minimum number of MRs at transport creation time
2. If workload causes the transport to exhaust its supply of
MRs, kick a worker thread to create some more
3. Maybe add a shrinker that can trim the MR list when the
system is under memory pressure
--
Chuck Lever
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