DPDK patches and discussions
 help / color / mirror / Atom feed
From: Marc Sune <marc.sune@bisdn.de>
To: dev@dpdk.org
Subject: [dpdk-dev] [PATCH] Adding RTE_KNI_PREEMPT configuration option
Date: Fri,  7 Nov 2014 12:00:37 +0100
Message-ID: <1415358037-424-1-git-send-email-marc.sune@bisdn.de> (raw)

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@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

             reply	other threads:[~2014-11-07 10:52 UTC|newest]

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-11-07 11:00 Marc Sune [this message]
2015-02-10 11:59 ` Marc Sune
2015-02-10 12:02   ` Bruce Richardson
2015-02-10 12:21     ` Marc Sune
2015-02-10 13:22       ` Bruce Richardson
2015-02-10 18:06         ` Marc Sune
2015-02-10 13:24   ` Bruce Richardson
2015-02-11  1:54     ` Zhang, Helin
2015-02-11 12:26       ` Marc Sune
2015-02-11 14:27         ` Bruce Richardson
2015-02-12  9:25           ` Marc Sune

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=1415358037-424-1-git-send-email-marc.sune@bisdn.de \
    --to=marc.sune@bisdn.de \
    --cc=dev@dpdk.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

DPDK patches and discussions

This inbox may be cloned and mirrored by anyone:

	git clone --mirror https://inbox.dpdk.org/dev/0 dev/git/0.git

	# If you have public-inbox 1.1+ installed, you may
	# initialize and index your mirror using the following commands:
	public-inbox-init -V2 dev dev/ https://inbox.dpdk.org/dev \
		dev@dpdk.org
	public-inbox-index dev

Example config snippet for mirrors.
Newsgroup available over NNTP:
	nntp://inbox.dpdk.org/inbox.dpdk.dev


AGPL code for this site: git clone https://public-inbox.org/public-inbox.git