-----Original Message----- > Date: Mon, 17 Sep 2018 16:17:24 +0800 > From: Gavin Hu <[email protected]> > To: [email protected] > CC: [email protected], [email protected], [email protected], > [email protected], [email protected], [email protected], > [email protected] > Subject: [PATCH v3 3/3] ring: move the atomic load of head above the loop > X-Mailer: git-send-email 2.7.4 > > External Email > > In __rte_ring_move_prod_head, move the __atomic_load_n up and out of > the do {} while loop as upon failure the old_head will be updated, > another load is costly and not necessary. > > This helps a little on the latency,about 1~5%. > > Test result with the patch(two cores): > SP/SC bulk enq/dequeue (size: 8): 5.64 > MP/MC bulk enq/dequeue (size: 8): 9.58 > SP/SC bulk enq/dequeue (size: 32): 1.98 > MP/MC bulk enq/dequeue (size: 32): 2.30 > > Fixes: 39368ebfc6 ("ring: introduce C11 memory model barrier option") > Cc: [email protected] > > Signed-off-by: Gavin Hu <[email protected]> > Reviewed-by: Honnappa Nagarahalli <[email protected]> > Reviewed-by: Steve Capper <[email protected]> > Reviewed-by: Ola Liljedahl <[email protected]>
Acked-by: Jerin Jacob <[email protected]> Tested-by: Jerin Jacob <[email protected]>
