While using ticket lock, cores repeatedly poll the lock variable.
This is replaced by rte_wait_until_equal API.
Running ticketlock_autotest on ThunderX2, with different numbers of cores
and depths of rings, 3%~8% performance gains were measured.
Signed-off-by: Gavin Hu <gavin...@arm.com>
Reviewed-by: Honnappa Nagarahalli <honnappa.nagaraha...@arm.com>
Tested-by: Pavan Nikhilesh <pbhagavat...@marvell.com>
---
lib/librte_eal/common/include/generic/rte_ticketlock.h | 3 +--
1 file changed, 1 insertion(+), 2 deletions(-)
diff --git a/lib/librte_eal/common/include/generic/rte_ticketlock.h
b/lib/librte_eal/common/include/generic/rte_ticketlock.h
index d9bec87..f0821f2 100644
--- a/lib/librte_eal/common/include/generic/rte_ticketlock.h
+++ b/lib/librte_eal/common/include/generic/rte_ticketlock.h
@@ -66,8 +66,7 @@ static inline void
rte_ticketlock_lock(rte_ticketlock_t *tl)
{
uint16_t me = __atomic_fetch_add(&tl->s.next, 1, __ATOMIC_RELAXED);
- while (__atomic_load_n(&tl->s.current, __ATOMIC_ACQUIRE) != me)
- rte_pause();
+ rte_wait_until_equal16(&tl->s.current, me, __ATOMIC_ACQUIRE);
}
/**
--
2.7.4
