From 16eaf25232ee9b880fe855bac4e8a5cf37b9e907 Mon Sep 17 00:00:00 2001 From: Marc Sune Date: Fri, 13 Feb 2015 15:25:25 +0100 Subject: [PATCH] kni: add build option to disable preempting 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. Signed-off-by: Marc Sune Acked-by: Bruce Richardson Acked-by: Helin Zhang --- 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 0234236189..199ecf5758 100644 --- a/config/common_linuxapp +++ b/config/common_linuxapp @@ -377,6 +377,7 @@ 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 868b32541e..1935d320ef 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; -- 2.20.1