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* [dpdk-dev] [PATCH v1] lib/distributor: fix livelock issue on flush
@ 2019-07-25  8:54 David Hunt
  2019-07-25  9:03 ` [dpdk-dev] [PATCH v2] " David Hunt
  0 siblings, 1 reply; 3+ messages in thread
From: David Hunt @ 2019-07-25  8:54 UTC (permalink / raw)
  To: dev; +Cc: david.hunt, stable

The Distributor autotest can lock if ran enough times. Worker and
distributir threads get into a livelock situation waiting on each
other.
Issue first encountered my RedHat in Travis CI
https://bugs.dpdk.org/show_bug.cgi?id=316

To repeat:
`while sudo sh -c "echo 'distributor_autotest' |
		./build/app/test/dpdk-test"; do :; done`

The root cause is where we are flushing on exit, and do not wait for
all worker packets to be returned before exiting.
Add a delay on flush so that all worker packets are returned before
completing the flush.

Bugzilla ID: 316
Fixes: 775003ad2f96 ("distributor: add new burst-capable library")
Cc: stable@dpdk.org

Tested-by: Michael Santana <msantana@redhat.com>
Signed-off-by: David Hunt <david.hunt@intel.com>
---
 lib/librte_distributor/rte_distributor.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/lib/librte_distributor/rte_distributor.c b/lib/librte_distributor/rte_distributor.c
index 9fa05f69a..21eb1fb0a 100644
--- a/lib/librte_distributor/rte_distributor.c
+++ b/lib/librte_distributor/rte_distributor.c
@@ -542,6 +542,9 @@ rte_distributor_flush_v1705(struct rte_distributor *d)
 	while (total_outstanding(d) > 0)
 		rte_distributor_process(d, NULL, 0);
 
+	/* wait 10ms to allow all worker drain the pkts */
+	rte_delay_us(10000);
+
 	/*
 	 * Send empty burst to all workers to allow them to exit
 	 * gracefully, should they need to.
-- 
2.17.1


^ permalink raw reply	[flat|nested] 3+ messages in thread

* [dpdk-dev] [PATCH v2] lib/distributor: fix livelock issue on flush
  2019-07-25  8:54 [dpdk-dev] [PATCH v1] lib/distributor: fix livelock issue on flush David Hunt
@ 2019-07-25  9:03 ` David Hunt
  2019-07-29 21:22   ` Thomas Monjalon
  0 siblings, 1 reply; 3+ messages in thread
From: David Hunt @ 2019-07-25  9:03 UTC (permalink / raw)
  To: dev; +Cc: david.hunt, Liang Ma, stable

From: Liang Ma <liang.j.ma@intel.com>

The Distributor autotest can lock if ran enough times. Worker and
distributir threads get into a livelock situation waiting on each
other.
Issue first encountered by RedHat in Travis CI
https://bugs.dpdk.org/show_bug.cgi?id=316

To repeat:
`while sudo sh -c "echo 'distributor_autotest' |
		./build/app/test/dpdk-test"; do :; done`

The root cause is where we are flushing on exit, and do not wait for
all worker packets to be returned before exiting.
Add a delay on flush so that all worker packets are returned before
completing the flush.

Bugzilla ID: 316
Fixes: 775003ad2f96 ("distributor: add new burst-capable library")
Cc: stable@dpdk.org

Tested-by: Michael Santana <msantana@redhat.com>
Signed-off-by: David Hunt <david.hunt@intel.com>
Signed-off-by: Liang Ma <liang.j.ma@intel.com>

---
v2 add correct patch attribution
---
 lib/librte_distributor/rte_distributor.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/lib/librte_distributor/rte_distributor.c b/lib/librte_distributor/rte_distributor.c
index 9fa05f69a..21eb1fb0a 100644
--- a/lib/librte_distributor/rte_distributor.c
+++ b/lib/librte_distributor/rte_distributor.c
@@ -542,6 +542,9 @@ rte_distributor_flush_v1705(struct rte_distributor *d)
 	while (total_outstanding(d) > 0)
 		rte_distributor_process(d, NULL, 0);
 
+	/* wait 10ms to allow all worker drain the pkts */
+	rte_delay_us(10000);
+
 	/*
 	 * Send empty burst to all workers to allow them to exit
 	 * gracefully, should they need to.
-- 
2.17.1


^ permalink raw reply	[flat|nested] 3+ messages in thread

* Re: [dpdk-dev] [PATCH v2] lib/distributor: fix livelock issue on flush
  2019-07-25  9:03 ` [dpdk-dev] [PATCH v2] " David Hunt
@ 2019-07-29 21:22   ` Thomas Monjalon
  0 siblings, 0 replies; 3+ messages in thread
From: Thomas Monjalon @ 2019-07-29 21:22 UTC (permalink / raw)
  To: David Hunt; +Cc: dev, Liang Ma, stable

25/07/2019 11:03, David Hunt:
> From: Liang Ma <liang.j.ma@intel.com>
> 
> The Distributor autotest can lock if ran enough times. Worker and
> distributir threads get into a livelock situation waiting on each
> other.
> Issue first encountered by RedHat in Travis CI
> https://bugs.dpdk.org/show_bug.cgi?id=316
> 
> To repeat:
> `while sudo sh -c "echo 'distributor_autotest' |
> 		./build/app/test/dpdk-test"; do :; done`
> 
> The root cause is where we are flushing on exit, and do not wait for
> all worker packets to be returned before exiting.
> Add a delay on flush so that all worker packets are returned before
> completing the flush.
> 
> Bugzilla ID: 316
> Fixes: 775003ad2f96 ("distributor: add new burst-capable library")
> Cc: stable@dpdk.org
> 
> Tested-by: Michael Santana <msantana@redhat.com>
> Signed-off-by: David Hunt <david.hunt@intel.com>
> Signed-off-by: Liang Ma <liang.j.ma@intel.com>

Applied, thanks




^ permalink raw reply	[flat|nested] 3+ messages in thread

end of thread, other threads:[~2019-07-29 21:22 UTC | newest]

Thread overview: 3+ messages (download: mbox.gz / follow: Atom feed)
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2019-07-25  8:54 [dpdk-dev] [PATCH v1] lib/distributor: fix livelock issue on flush David Hunt
2019-07-25  9:03 ` [dpdk-dev] [PATCH v2] " David Hunt
2019-07-29 21:22   ` Thomas Monjalon

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