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From: Marc Sune <marc.sune@bisdn.de>
To: dev@dpdk.org
Subject: [dpdk-dev] [PATCH v2] Adding RTE_KNI_PREEMPT_DEFAULT configuration option
Date: Fri, 13 Feb 2015 15:25:25 +0100	[thread overview]
Message-ID: <1423837525-22283-1-git-send-email-marc.sune@bisdn.de> (raw)

This patch introduces CONFIG_RTE_KNI_PREEMPT_DEFAULT flag. When set to 'no',
KNI kernel thread(s) do not call schedule_timeout_interruptible(), which
improves overall KNI performance at the expense of CPU cycles (polling).

Default values is 'yes', maintaining the same behaviour as of now.

v2: CONFIG_RTE_KNI_PREEMPT -> CONFIG_RTE_KNI_PREEMPT_DEFAULT

Signed-off-by: Marc Sune <marc.sune@bisdn.de>
---
 config/common_linuxapp                 | 1 +
 lib/librte_eal/linuxapp/kni/kni_misc.c | 4 ++++
 2 files changed, 5 insertions(+)

diff --git a/config/common_linuxapp b/config/common_linuxapp
index d428f84..72ba6ab 100644
--- a/config/common_linuxapp
+++ b/config/common_linuxapp
@@ -359,6 +359,7 @@ CONFIG_RTE_LIBRTE_PIPELINE=y
 # Compile librte_kni
 #
 CONFIG_RTE_LIBRTE_KNI=y
+CONFIG_RTE_KNI_PREEMPT_DEFAULT=y
 CONFIG_RTE_KNI_KO_DEBUG=n
 CONFIG_RTE_KNI_VHOST=n
 CONFIG_RTE_KNI_VHOST_MAX_CACHE_SIZE=1024
diff --git a/lib/librte_eal/linuxapp/kni/kni_misc.c b/lib/librte_eal/linuxapp/kni/kni_misc.c
index 868b325..1935d32 100644
--- a/lib/librte_eal/linuxapp/kni/kni_misc.c
+++ b/lib/librte_eal/linuxapp/kni/kni_misc.c
@@ -229,9 +229,11 @@ kni_thread_single(void *unused)
 			}
 		}
 		up_read(&kni_list_lock);
+#ifdef RTE_KNI_PREEMPT_DEFAULT
 		/* reschedule out for a while */
 		schedule_timeout_interruptible(usecs_to_jiffies( \
 				KNI_KTHREAD_RESCHEDULE_INTERVAL));
+#endif
 	}
 
 	return 0;
@@ -252,8 +254,10 @@ kni_thread_multiple(void *param)
 #endif
 			kni_net_poll_resp(dev);
 		}
+#ifdef RTE_KNI_PREEMPT_DEFAULT
 		schedule_timeout_interruptible(usecs_to_jiffies( \
 				KNI_KTHREAD_RESCHEDULE_INTERVAL));
+#endif
 	}
 
 	return 0;
-- 
2.1.4

             reply	other threads:[~2015-02-13 14:25 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-02-13 14:25 Marc Sune [this message]
2015-02-17  1:21 ` Zhang, Helin
2015-02-23 17:53   ` Thomas Monjalon

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