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authorChuck Lever <chuck.lever@oracle.com>2021-02-09 10:32:20 -0500
committerChuck Lever <chuck.lever@oracle.com>2021-08-17 11:47:53 -0400
commitb6c2bfea096ba22583f1071c10ce0745804b9b95 (patch)
treed6a74441d55852b6335b4fe935300550d2bb993a /drivers/zorro
parent6c8c84f525100a1cade5698320b4abe43062e159 (diff)
downloadlinux-b6c2bfea096ba22583f1071c10ce0745804b9b95.tar.bz2
svcrdma: Relieve contention on sc_send_lock.
/proc/lock_stat indicates the the sc_send_lock is heavily contended when the server is under load from a single client. To address this, convert the send_ctxt free list to an llist. Returning an item to the send_ctxt cache is now waitless, which reduces the instruction path length in the single-threaded Send handler (svc_rdma_wc_send). The goal is to enable the ib_comp_wq worker to handle a higher RPC/RDMA Send completion rate given the same CPU resources. This change reduces CPU utilization of Send completion by 2-3% on my server. Signed-off-by: Chuck Lever <chuck.lever@oracle.com> Reviewed-By: Tom Talpey <tom@talpey.com>
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