[dpdk-dev] [PATCH v2] Adding RTE_KNI_PREEMPT_DEFAULT configuration option
Marc Sune
marc.sune at bisdn.de
Fri Feb 13 15:25:25 CET 2015
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 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 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
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