xprtrdma: Streamline rpcrdma_post_recvs

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rb_lock is contended between rpcrdma_buffer_create,
rpcrdma_buffer_put, and rpcrdma_post_recvs.

Commit e340c2d6ef ("xprtrdma: Reduce the doorbell rate (Receive)")
causes rpcrdma_post_recvs to take the rb_lock repeatedly when it
determines more Receives are needed. Streamline this code path so
it takes the lock just once in most cases to build the Receive
chain that is about to be posted.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>

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Chuck Lever 2019-06-19 10:33:26 -04:00 • committed by Anna Schumaker

parent 379d1bc5be

commit 9ef33ef5b6

1 changed files with 38 additions and 21 deletions

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net/sunrpc/xprtrdma/verbs.c

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