From: "Ananyev, Konstantin" <konstantin.ananyev@intel.com>
To: "Burakov, Anatoly" <anatoly.burakov@intel.com>,
"Tan, Jianfeng" <jianfeng.tan@intel.com>,
"dev@dpdk.org" <dev@dpdk.org>
Cc: "Richardson, Bruce" <bruce.richardson@intel.com>,
"thomas@monjalon.net" <thomas@monjalon.net>
Subject: Re: [dpdk-dev] [PATCH v3 2/3] eal: add synchronous multi-process communication
Date: Thu, 25 Jan 2018 15:03:58 +0000 [thread overview]
Message-ID: <2601191342CEEE43887BDE71AB9772588628380A@irsmsx105.ger.corp.intel.com> (raw)
In-Reply-To: <374c05b2-1334-925f-3035-a24b79fe7ff9@intel.com>
> -----Original Message-----
> From: Burakov, Anatoly
> Sent: Thursday, January 25, 2018 1:10 PM
> To: Ananyev, Konstantin <konstantin.ananyev@intel.com>; Tan, Jianfeng <jianfeng.tan@intel.com>; dev@dpdk.org
> Cc: Richardson, Bruce <bruce.richardson@intel.com>; thomas@monjalon.net
> Subject: Re: [dpdk-dev] [PATCH v3 2/3] eal: add synchronous multi-process communication
>
> On 25-Jan-18 1:05 PM, Burakov, Anatoly wrote:
> > On 25-Jan-18 1:00 PM, Ananyev, Konstantin wrote:
> >>
> >>
> >>> -----Original Message-----
> >>> From: Burakov, Anatoly
> >>> Sent: Thursday, January 25, 2018 12:26 PM
> >>> To: Ananyev, Konstantin <konstantin.ananyev@intel.com>; Tan, Jianfeng
> >>> <jianfeng.tan@intel.com>; dev@dpdk.org
> >>> Cc: Richardson, Bruce <bruce.richardson@intel.com>; thomas@monjalon.net
> >>> Subject: Re: [PATCH v3 2/3] eal: add synchronous multi-process
> >>> communication
> >>>
> >>> On 25-Jan-18 12:19 PM, Ananyev, Konstantin wrote:
> >>>>
> >>>>
> >>>>> -----Original Message-----
> >>>>> From: Burakov, Anatoly
> >>>>> Sent: Thursday, January 25, 2018 12:00 PM
> >>>>> To: Tan, Jianfeng <jianfeng.tan@intel.com>; dev@dpdk.org
> >>>>> Cc: Richardson, Bruce <bruce.richardson@intel.com>; Ananyev,
> >>>>> Konstantin <konstantin.ananyev@intel.com>; thomas@monjalon.net
> >>>>> Subject: Re: [PATCH v3 2/3] eal: add synchronous multi-process
> >>>>> communication
> >>>>>
> >>>>> On the overall patch,
> >>>>>
> >>>>> Reviewed-by: Anatoly Burakov <anatoly.burakov@intel.com>
> >>>>>
> >>>>> For request(), returning number of replies received actually makes
> >>>>> sense, because now we get use the value to read our replies, if we
> >>>>> were
> >>>>> a primary process sending messages to secondary processes.
> >>>>
> >>>> Yes, I also think it is good to return number of sends.
> >>>> Then caller can compare number of sended requests with number of
> >>>> received replies and decide should it be considered a failure or no.
> >>>>
> >>>
> >>> Well, OK, that might make sense. However, i think it would've be of more
> >>> value to make the API consistent (0/-1 on success/failure) and put
> >>> number of sent messages into the reply, like number of received. I.e.
> >>> something like
> >>>
> >>> struct reply {
> >>> int nb_sent;
> >>> int nb_received;
> >>> };
> >>>
> >>> We do it for the latter already, so why not the former?
> >>
> >> The question is what treat as success/failure?
> >> Let say we sent 2 requests (of 3 possible), got back 1 response...
> >> Should we consider it as success or failure?
> >>
> >
> > I think "failure" is "something went wrong", not "secondary processes
> > didn't respond". For example, invalid parameters, or our socket suddenly
> > being closed, or some other error that prevents us from sending requests
> > to secondaries.
> >
> > As far as i can tell from the code, there's no way to know if the
> > secondary process is running other than by attempting to connect to it,
> > and get a response. So, failed connection should not be a failure
> > condition, because we can't know if we *can* connect to the process
> > until we do. Process may have ended, but socket files will still be
> > around, and there's nothing we can do about that. So i wouldn't consider
> > inability to send a message a failure condition.
> >
>
> Just to clarify - i'm suggesting leaving this decision up to the user.
> If a user expects there to be "n" processes running, but only "m"
> responses were received, he could treat it as error. Another user might
> simply send periodical updates/polls to secondaries, for whatever reason
> (say, stats display), and won't really care if one of them just died, so
> there's no error for that user.
>
> However, all of this has nothing to do with API. If we're able to send
> messages - it's not a failure. If we can't - it is. That's the part API
> should be concerned about, and that's what the return value should
> indicate, IMO.
Ok so to clarify, you are suggesting:
we have N peers - if send_msg() returns success for all N - return success
(no matter did we get a reply or not)
Otherwise return a failure.
?
Konstantin
>
> --
> Thanks,
> Anatoly
next prev parent reply other threads:[~2018-01-25 15:04 UTC|newest]
Thread overview: 88+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-11-30 18:44 [dpdk-dev] [PATCH 0/3] generic channel for " Jianfeng Tan
2017-11-30 18:44 ` [dpdk-dev] [PATCH 1/3] eal: add " Jianfeng Tan
2017-12-11 11:04 ` Burakov, Anatoly
2017-12-11 16:43 ` Ananyev, Konstantin
2017-11-30 18:44 ` [dpdk-dev] [PATCH 2/3] eal: add synchronous " Jianfeng Tan
2017-12-11 11:39 ` Burakov, Anatoly
2017-12-11 16:49 ` Ananyev, Konstantin
2017-11-30 18:44 ` [dpdk-dev] [PATCH 3/3] vfio: use the generic multi-process channel Jianfeng Tan
2017-12-11 12:01 ` Burakov, Anatoly
2017-12-11 9:59 ` [dpdk-dev] [PATCH 0/3] generic channel for multi-process communication Burakov, Anatoly
2017-12-12 7:34 ` Tan, Jianfeng
2017-12-12 16:18 ` Burakov, Anatoly
2018-01-11 4:07 ` [dpdk-dev] [PATCH v2 0/4] " Jianfeng Tan
2018-01-11 4:07 ` [dpdk-dev] [PATCH v2 1/4] eal: add " Jianfeng Tan
2018-01-13 12:57 ` Burakov, Anatoly
2018-01-15 19:52 ` Ananyev, Konstantin
2018-01-11 4:07 ` [dpdk-dev] [PATCH v2 2/4] eal: add and del secondary processes in the primary Jianfeng Tan
2018-01-13 13:11 ` Burakov, Anatoly
2018-01-15 21:45 ` Ananyev, Konstantin
2018-01-11 4:07 ` [dpdk-dev] [PATCH v2 3/4] eal: add synchronous multi-process communication Jianfeng Tan
2018-01-13 13:41 ` Burakov, Anatoly
2018-01-16 0:00 ` Ananyev, Konstantin
2018-01-16 8:10 ` Tan, Jianfeng
2018-01-16 11:12 ` Ananyev, Konstantin
2018-01-16 16:47 ` Tan, Jianfeng
2018-01-17 10:50 ` Ananyev, Konstantin
2018-01-17 13:09 ` Tan, Jianfeng
2018-01-17 13:15 ` Tan, Jianfeng
2018-01-17 17:20 ` Ananyev, Konstantin
2018-01-11 4:07 ` [dpdk-dev] [PATCH v2 4/4] vfio: use the generic multi-process channel Jianfeng Tan
2018-01-13 14:03 ` Burakov, Anatoly
2018-03-04 14:57 ` [dpdk-dev] [PATCH v5] vfio: change to use " Jianfeng Tan
2018-03-14 13:27 ` Burakov, Anatoly
2018-03-19 6:53 ` Tan, Jianfeng
2018-03-20 10:33 ` Burakov, Anatoly
2018-03-20 10:56 ` Burakov, Anatoly
2018-03-20 8:50 ` [dpdk-dev] [PATCH v6] " Jianfeng Tan
2018-04-05 14:26 ` Tan, Jianfeng
2018-04-05 14:39 ` Burakov, Anatoly
2018-04-12 23:27 ` Thomas Monjalon
2018-04-12 15:26 ` Burakov, Anatoly
2018-04-15 15:06 ` [dpdk-dev] [PATCH v7] " Jianfeng Tan
2018-04-15 15:10 ` Tan, Jianfeng
2018-04-17 23:04 ` Thomas Monjalon
2018-01-25 4:16 ` [dpdk-dev] [PATCH v3 0/3] generic channel for multi-process communication Jianfeng Tan
2018-01-25 4:16 ` [dpdk-dev] [PATCH v3 1/3] eal: add " Jianfeng Tan
2018-01-25 10:41 ` Thomas Monjalon
2018-01-25 11:27 ` Burakov, Anatoly
2018-01-25 11:34 ` Thomas Monjalon
2018-01-25 12:21 ` Ananyev, Konstantin
2018-01-25 4:16 ` [dpdk-dev] [PATCH v3 2/3] eal: add synchronous " Jianfeng Tan
2018-01-25 12:00 ` Burakov, Anatoly
2018-01-25 12:19 ` Burakov, Anatoly
2018-01-25 12:19 ` Ananyev, Konstantin
2018-01-25 12:25 ` Burakov, Anatoly
2018-01-25 13:00 ` Ananyev, Konstantin
2018-01-25 13:05 ` Burakov, Anatoly
2018-01-25 13:10 ` Burakov, Anatoly
2018-01-25 15:03 ` Ananyev, Konstantin [this message]
2018-01-25 16:22 ` Burakov, Anatoly
2018-01-25 17:10 ` Tan, Jianfeng
2018-01-25 18:02 ` Burakov, Anatoly
2018-01-25 12:22 ` Ananyev, Konstantin
2018-01-25 4:16 ` [dpdk-dev] [PATCH v3 3/3] vfio: use the generic multi-process channel Jianfeng Tan
2018-01-25 10:47 ` Thomas Monjalon
2018-01-25 10:52 ` Burakov, Anatoly
2018-01-25 10:57 ` Thomas Monjalon
2018-01-25 12:15 ` Burakov, Anatoly
2018-01-25 19:14 ` [dpdk-dev] [PATCH v4 0/2] generic channel for multi-process communication Jianfeng Tan
2018-01-25 19:14 ` [dpdk-dev] [PATCH v4 1/2] eal: add synchronous " Jianfeng Tan
2018-01-25 19:14 ` [dpdk-dev] [PATCH v4 2/2] vfio: use the generic multi-process channel Jianfeng Tan
2018-01-25 19:15 ` [dpdk-dev] [PATCH v4 0/2] generic channel for multi-process communication Tan, Jianfeng
2018-01-25 19:21 ` [dpdk-dev] [PATCH v5 " Jianfeng Tan
2018-01-25 19:21 ` [dpdk-dev] [PATCH v5 1/2] eal: add " Jianfeng Tan
2018-01-25 19:21 ` [dpdk-dev] [PATCH v5 2/2] eal: add synchronous " Jianfeng Tan
2018-01-25 21:23 ` [dpdk-dev] [PATCH v5 0/2] generic channel for " Thomas Monjalon
2018-01-26 3:41 ` [dpdk-dev] [PATCH v6 " Jianfeng Tan
2018-01-26 3:41 ` [dpdk-dev] [PATCH v6 1/2] eal: add " Jianfeng Tan
2018-01-26 10:25 ` Burakov, Anatoly
2018-01-29 6:37 ` Tan, Jianfeng
2018-01-29 9:37 ` Burakov, Anatoly
2018-01-26 3:41 ` [dpdk-dev] [PATCH v6 2/2] eal: add synchronous " Jianfeng Tan
2018-01-26 10:31 ` Burakov, Anatoly
2018-01-29 23:52 ` [dpdk-dev] [PATCH v6 0/2] generic channel for " Thomas Monjalon
2018-01-30 6:58 ` [dpdk-dev] [PATCH v7 " Jianfeng Tan
2018-01-30 6:58 ` [dpdk-dev] [PATCH v7 1/2] eal: add " Jianfeng Tan
2018-01-30 6:58 ` [dpdk-dev] [PATCH v7 2/2] eal: add synchronous " Jianfeng Tan
2018-01-30 14:46 ` [dpdk-dev] [PATCH v7 0/2] generic channel for " Thomas Monjalon
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