On 6/7/2016 6:01 PM, Jason Gunthorpe wrote:
On Tue, Jun 07, 2016 at 05:51:04PM -0400, Chuck Lever wrote:
There is a practical number of MRs that can be allocated
per device, I thought. And each MR consumes some amount
of host memory.
xprtrdma is happy to allocate thousands of MRs per QP/PD
pair, but that isn't practical as you start adding more
transports/connections.
Yes, this is all sane and valid.
Typically you'd target a concurrency limit per QP and allocate
everything (# MRs, sq,rq,cq depth, etc) in accordance with that goal,
I'd also suggest that target concurrency is probably a user tunable..
This is already present - it's the RPC slot table depth. It would be
great, IMO, to make this a mount parameter since it is transport- and
also server-dependent, but currently I believe it is just a kernel
RPC module parameter.
Tom.
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