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From: Lukasz Wojciechowski <l.wojciechow@partner.samsung.com>
To: David Marchand <david.marchand@redhat.com>
Cc: Jerin Jacob Kollanukkaran <jerinj@marvell.com>,
	"dev@dpdk.org" <dev@dpdk.org>,
	"stable@dpdk.org" <stable@dpdk.org>,
	"Van Haaren, Harry" <harry.van.haaren@intel.com>
Subject: Re: [dpdk-stable] [PATCH v2] eal: fix lcore state bug
Date: Wed, 8 Jul 2020 21:37:20 +0200	[thread overview]
Message-ID: <0ea9101c-3248-22cb-85a1-1b1f08e44069@partner.samsung.com> (raw)
In-Reply-To: <CAJFAV8xWa6WZy_GAZ2yrY6qrCWbyjGaMWYjLhXUjpDd2QnM+bQ@mail.gmail.com>


W dniu 08.07.2020 o 19:10, David Marchand pisze:
> On Wed, Jul 8, 2020 at 4:52 PM Van Haaren, Harry
> <harry.van.haaren@intel.com> wrote:
>>> The rte_service_lcore_reset_all function stops execution of services
>>> on all lcores and switches them back from ROLE_SERVICE to ROLE_RTE.
>>> However the thread loop for slave lcores (eal_thread_loop) distincts these
>>> roles to set lcore state after processing delegated function.
>>> It sets WAIT state for ROLE_SERVICE, but FINISHED for ROLE_RTE.
>>> So changing the role to RTE before stopping work in slave lcores
>>> causes lcores to end in FINISHED state. That is why the rte_eal_lcore_wait
>>> must be run after rte_service_lcore_reset_all to bring back lcores to
>>> launchable (WAIT) state.
>>> This has been fixed in test app and clarified in API documentation.
>>>
>>> Setting the state to WAIT in rte_service_runner_func is premature
>>> as the rte_service_runner_func function is still a part of the lcore
>>> function delegated to slave lcore. The state is overwritten anyway in
>>> slave lcore thread loop. This premature setting state to WAIT might
>>> however cause rte_eal_lcore_wait, that was called by the application,
>>> to return before slave lcore thread set the FINISHED state. That's
>>> why it is removed from librte_eal rte_service_runner_func function.
> Thanks for the explanation and fix.
>
>>> Bugzilla ID: 464
>>> Fixes: 21698354c832 ("service: introduce service cores concept")
>>> Fixes: f038a81e1c56 ("service: add unit tests")
>>> Cc: stable@dpdk.org
>>>
> Reported-by: Sarosh Arif <sarosh.arif@emumba.com>
>>> Signed-off-by: Lukasz Wojciechowski <l.wojciechow@partner.samsung.com>
>> Acked-by: Harry van Haaren <harry.van.haaren@intel.com>
> Applied, thanks Lukasz.
>
Great, thank you

-- 
Lukasz Wojciechowski
Principal Software Engineer

Samsung R&D Institute Poland
Samsung Electronics
Office +48 22 377 88 25
l.wojciechow@partner.samsung.com


      reply	other threads:[~2020-07-08 19:37 UTC|newest]

Thread overview: 17+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <CGME20200428012204eucas1p120a84e501d0d64145c21476cd2562f36@eucas1p1.samsung.com>
2020-04-28  1:21 ` [dpdk-stable] [PATCH] " Lukasz Wojciechowski
2020-04-29  3:11   ` [dpdk-stable] [dpdk-dev] " Ruifeng Wang
2020-04-29 15:07   ` Phil Yang
2020-04-29 21:32     ` Lukasz Wojciechowski
2020-04-30  2:54       ` Phil Yang
2020-04-30  9:06         ` Lukasz Wojciechowski
2020-05-08 16:12         ` Van Haaren, Harry
2020-05-08 17:04           ` Lukasz Wojciechowski
2020-05-18 18:25   ` [dpdk-stable] " Lukasz Wojciechowski
2020-05-18 18:39     ` David Marchand
2020-05-18 18:43       ` Lukasz Wojciechowski
2020-05-20 11:40         ` Van Haaren, Harry
2020-05-20 12:47           ` Lukasz Wojciechowski
     [not found]   ` <CGME20200708133748eucas1p2dbe34d8605d8f618559daee9cbeaa73d@eucas1p2.samsung.com>
2020-07-08 13:37     ` [dpdk-stable] [PATCH v2] " Lukasz Wojciechowski
2020-07-08 14:52       ` Van Haaren, Harry
2020-07-08 17:10         ` David Marchand
2020-07-08 19:37           ` Lukasz Wojciechowski [this message]

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