xprtrdma: Acquire FMRs in rpcrdma_fmr_register_external()

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Acquiring 64 FMRs in rpcrdma_buffer_get() while holding the buffer
pool lock is expensive, and unnecessary because FMR mode can
transfer up to a 1MB payload using just a single ib_fmr.

Instead, acquire ib_fmrs one-at-a-time as chunks are registered, and
return them to rb_mws immediately during deregistration.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Reviewed-by: Steve Wise <swise@opengridcomputing.com>
Tested-By: Devesh Sharma <devesh.sharma@avagotech.com>
Reviewed-by: Doug Ledford <dledford@redhat.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>

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This commit is contained in:

Chuck Lever 2015-05-26 11:52:16 -04:00 • committed by Anna Schumaker

parent 346aa66b2a

commit fc7fbb59e7

2 changed files with 48 additions and 30 deletions

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52

net/sunrpc/xprtrdma/fmr_ops.c

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26

net/sunrpc/xprtrdma/verbs.c

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