[dpdk-dev] [PATCH] eal: optimize timer routines

[Jerin Jacob]

Since DPDK has only two timer sources,
Avoid &eal_timer_source memory read and followed
by the switch case statement when
RTE_LIBEAL_USE_HPET is not defined.

Signed-off-by: Jerin Jacob <jerin.ja...@caviumnetworks.com>
---
 lib/librte_eal/common/include/generic/rte_cycles.h | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

diff --git a/lib/librte_eal/common/include/generic/rte_cycles.h 
b/lib/librte_eal/common/include/generic/rte_cycles.h
index 00103ca9f..2f3dea06e 100644
--- a/lib/librte_eal/common/include/generic/rte_cycles.h
+++ b/lib/librte_eal/common/include/generic/rte_cycles.h
@@ -150,15 +150,17 @@ int rte_eal_hpet_init(int make_default);
 static inline uint64_t
 rte_get_timer_cycles(void)
 {
+#ifdef RTE_LIBEAL_USE_HPET
        switch(eal_timer_source) {
        case EAL_TIMER_TSC:
                return rte_get_tsc_cycles();
        case EAL_TIMER_HPET:
-#ifdef RTE_LIBEAL_USE_HPET
                return rte_get_hpet_cycles();
-#endif
        default: rte_panic("Invalid timer source specified\n");
        }
+#else
+       return rte_get_tsc_cycles();
+#endif
 }
 
 /**
@@ -170,15 +172,17 @@ rte_get_timer_cycles(void)
 static inline uint64_t
 rte_get_timer_hz(void)
 {
+#ifdef RTE_LIBEAL_USE_HPET
        switch(eal_timer_source) {
        case EAL_TIMER_TSC:
                return rte_get_tsc_hz();
        case EAL_TIMER_HPET:
-#ifdef RTE_LIBEAL_USE_HPET
                return rte_get_hpet_hz();
-#endif
        default: rte_panic("Invalid timer source specified\n");
        }
+#else
+       return rte_get_tsc_hz();
+#endif
 }
 /**
  * Wait at least us microseconds.
-- 
2.12.2