From 886fe2746ccb748b2304b181c93c5b948da9e387 Mon Sep 17 00:00:00 2001
From: jingleyang <yjyfrombnu@gmail.com>
Date: Tue, 25 Dec 2018 10:55:10 +0800
Subject: comment: block sleep is necessary

---
 pcap-dpdk.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

(limited to 'pcap-dpdk.c')

diff --git a/pcap-dpdk.c b/pcap-dpdk.c
index a3f8bd55..1fcbcd38 100644
--- a/pcap-dpdk.c
+++ b/pcap-dpdk.c
@@ -235,7 +235,8 @@ static int dpdk_read_with_timeout(pcap_t *p, uint16_t portid, uint16_t queueid,s
 				if (p->break_loop){
 					break;
 				}
-				// sleep for a very short while, but do not block CPU.
+				// sleep for a very short while.
+				// block sleep is the only choice, since usleep() will impact performance dramatically.
 				rte_delay_us_block(DPDK_DEF_MIN_SLEEP_MS*1000);
 				sleep_ms += DPDK_DEF_MIN_SLEEP_MS;
 			}
-- 
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