[dpdk-dev] [PATCH] Adding RTE_KNI_PREEMPT configuration option
Marc Sune
marc.sune at bisdn.de
Fri Nov 7 12:00:37 CET 2014
This patch introduces CONFIG_RTE_KNI_PREEMPT 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.
Signed-off-by: Marc Sune <marc.sune at 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 57b61c9..24b529d 100644
--- a/config/common_linuxapp
+++ b/config/common_linuxapp
@@ -380,6 +380,7 @@ CONFIG_RTE_LIBRTE_PIPELINE=y
# Compile librte_kni
#
CONFIG_RTE_LIBRTE_KNI=y
+CONFIG_RTE_KNI_PREEMPT=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 ba77776..e7e6c27 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
/* 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
schedule_timeout_interruptible(usecs_to_jiffies( \
KNI_KTHREAD_RESCHEDULE_INTERVAL));
+#endif
}
return 0;
--
1.7.10.4
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