From: Jerin Jacob <jerin.jacob@caviumnetworks.com>
Date: Tue, 2 May 2017 05:19:51 +0000 (+0530)
Subject: eal: optimize TSC routines when HPET is disabled
X-Git-Tag: spdx-start~3284
X-Git-Url: http://git.droids-corp.org/?a=commitdiff_plain;h=b5dc89392f42b8bad06f3dbf767425bd1a00e59b;p=dpdk.git

eal: optimize TSC routines when HPET is disabled

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.jacob@caviumnetworks.com>
---

diff --git a/lib/librte_eal/common/include/generic/rte_cycles.h b/lib/librte_eal/common/include/generic/rte_cycles.h
index 00103ca9f6..0e645c2c49 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:
+#endif
 		return rte_get_tsc_cycles();
-	case EAL_TIMER_HPET:
 #ifdef RTE_LIBEAL_USE_HPET
+	case EAL_TIMER_HPET:
 		return rte_get_hpet_cycles();
-#endif
 	default: rte_panic("Invalid timer source specified\n");
 	}
+#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:
+#endif
 		return rte_get_tsc_hz();
-	case EAL_TIMER_HPET:
 #ifdef RTE_LIBEAL_USE_HPET
+	case EAL_TIMER_HPET:
 		return rte_get_hpet_hz();
-#endif
 	default: rte_panic("Invalid timer source specified\n");
 	}
+#endif
 }
 /**
  * Wait at least us microseconds.