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kni: add build option to disable preempting

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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 <marc.sune@bisdn.de>
Acked-by: Bruce Richardson <bruce.richardson@intel.com>
Acked-by: Helin Zhang <helin.zhang@intel.com>
This commit is contained in:
Marc Sune 2015-02-13 15:25:25 +01:00 committed by Thomas Monjalon
parent 6597fc642d
commit 16eaf25232
2 changed files with 5 additions and 0 deletions
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1
config/common_linuxapp
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@ -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

4
lib/librte_eal/linuxapp/kni/kni_misc.c
View File

@ -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;