From: Mordechay Haimovsky <motih@mellanox.com>
To: Thomas Monjalon <thomas@monjalon.net>,
"Singh, Jasvinder" <jasvinder.singh@intel.com>
Cc: "dev@dpdk.org" <dev@dpdk.org>,
"Iremonger, Bernard" <bernard.iremonger@intel.com>,
"Pattan, Reshma" <reshma.pattan@intel.com>,
"olivier.matz@6wind.com" <olivier.matz@6wind.com>,
"Van Haaren, Harry" <harry.van.haaren@intel.com>,
"Ananyev, Konstantin" <konstantin.ananyev@intel.com>,
"Dumitrescu, Cristian" <cristian.dumitrescu@intel.com>
Subject: Re: [dpdk-dev] [PATCH] app/testpmd: fix testpmd exit using ctrl+d
Date: Wed, 25 Jul 2018 11:55:50 +0000 [thread overview]
Message-ID: <AM0PR05MB443505D7C232D5879BA05DAED2540@AM0PR05MB4435.eurprd05.prod.outlook.com> (raw)
In-Reply-To: <2601191342CEEE43887BDE71AB977258DF51D5A2@irsmsx105.ger.corp.intel.com>
This is how we reproduce the issue :
app/testpmd -n 4 --vdev="net_tap0,iface=tap0,remote=eth1" -- --burst=64 --mbcache=512 -i --rxq=2 --txq=2 --txd=512 --rxd=512 --port-topology=chained --forward-mode=rxonly
> -----Original Message-----
> From: Ananyev, Konstantin [mailto:konstantin.ananyev@intel.com]
> Sent: Wednesday, July 25, 2018 2:39 PM
> To: Dumitrescu, Cristian <cristian.dumitrescu@intel.com>; Mordechay
> Haimovsky <motih@mellanox.com>; Thomas Monjalon
> <thomas@monjalon.net>; Singh, Jasvinder <jasvinder.singh@intel.com>
> Cc: dev@dpdk.org; Iremonger, Bernard <bernard.iremonger@intel.com>;
> Pattan, Reshma <reshma.pattan@intel.com>; olivier.matz@6wind.com; Van
> Haaren, Harry <harry.van.haaren@intel.com>
> Subject: RE: [dpdk-dev] [PATCH] app/testpmd: fix testpmd exit using ctrl+d
>
>
>
> > -----Original Message-----
> > From: Dumitrescu, Cristian
> > Sent: Wednesday, July 25, 2018 10:36 AM
> > To: Ananyev, Konstantin <konstantin.ananyev@intel.com>; Mordechay
> > Haimovsky <motih@mellanox.com>; Thomas Monjalon
> <thomas@monjalon.net>;
> > Singh, Jasvinder <jasvinder.singh@intel.com>
> > Cc: dev@dpdk.org; Iremonger, Bernard <bernard.iremonger@intel.com>;
> > Pattan, Reshma <reshma.pattan@intel.com>; olivier.matz@6wind.com
> > Subject: RE: [dpdk-dev] [PATCH] app/testpmd: fix testpmd exit using
> > ctrl+d
> >
> >
> >
> > > -----Original Message-----
> > > From: Ananyev, Konstantin
> > > Sent: Wednesday, July 25, 2018 10:04 AM
> > > To: Dumitrescu, Cristian <cristian.dumitrescu@intel.com>; Mordechay
> > > Haimovsky <motih@mellanox.com>; Thomas Monjalon
> > > <thomas@monjalon.net>; Singh, Jasvinder <jasvinder.singh@intel.com>
> > > Cc: dev@dpdk.org; Iremonger, Bernard
> <bernard.iremonger@intel.com>;
> > > Pattan, Reshma <reshma.pattan@intel.com>; olivier.matz@6wind.com
> > > Subject: RE: [dpdk-dev] [PATCH] app/testpmd: fix testpmd exit using
> > > ctrl+d
> > >
> > >
> > >
> > > > -----Original Message-----
> > > > From: dev [mailto:dev-bounces@dpdk.org] On Behalf Of Dumitrescu,
> > > Cristian
> > > > Sent: Tuesday, July 24, 2018 5:59 PM
> > > > To: Mordechay Haimovsky <motih@mellanox.com>; Thomas Monjalon
> > > <thomas@monjalon.net>; Singh, Jasvinder
> > > > <jasvinder.singh@intel.com>
> > > > Cc: dev@dpdk.org; Iremonger, Bernard
> > > > <bernard.iremonger@intel.com>;
> > > Pattan, Reshma <reshma.pattan@intel.com>;
> > > > olivier.matz@6wind.com
> > > > Subject: Re: [dpdk-dev] [PATCH] app/testpmd: fix testpmd exit
> > > > using ctrl+d
> > > >
> > > >
> > > >
> > > > > -----Original Message-----
> > > > > From: Mordechay Haimovsky [mailto:motih@mellanox.com]
> > > > > Sent: Tuesday, July 24, 2018 3:37 PM
> > > > > To: Thomas Monjalon <thomas@monjalon.net>; Singh, Jasvinder
> > > > > <jasvinder.singh@intel.com>
> > > > > Cc: dev@dpdk.org; Iremonger, Bernard
> > > > > <bernard.iremonger@intel.com>; Pattan, Reshma
> > > > > <reshma.pattan@intel.com>; olivier.matz@6wind.com; Dumitrescu,
> > > > > Cristian <cristian.dumitrescu@intel.com>
> > > > > Subject: RE: [dpdk-dev] [PATCH] app/testpmd: fix testpmd exit
> > > > > using
> > > ctrl+d
> > > > >
> > > > > Even after this fix we still have setups that use netvsc for
> > > > > example, on which testpmd exits with rte_panic right after
> > > > > loading it even without touching the KBD.
> > > > >
> > > > > I recommend returning the previous prompt routine in test-
> > > pmd/cmdline.c
> > > > > and rework the SOFTNIC section there, preferably moving its poll
> > > > > section
> > > to
> > > > > use rte_service in a separate file cleaning the CLI files from
> > > > > PMD-specific implementation.
> > > > >
> > > > > > -----Original Message-----
> > > > > > From: Thomas Monjalon [mailto:thomas@monjalon.net]
> > > > > > Sent: Tuesday, July 24, 2018 3:34 PM
> > > > > > To: Jasvinder Singh <jasvinder.singh@intel.com>
> > > > > > Cc: dev@dpdk.org; bernard.iremonger@intel.com;
> > > > > > reshma.pattan@intel.com; Mordechay Haimovsky
> > > > > <motih@mellanox.com>;
> > > > > > olivier.matz@6wind.com; cristian.dumitrescu@intel.com
> > > > > > Subject: Re: [dpdk-dev] [PATCH] app/testpmd: fix testpmd exit
> > > > > > using
> > > ctrl+d
> > > > > >
> > > > > > Important note:
> > > > > > testpmd is currently really broken.
> > > > > > We cannot have a RC2 until it is fixed.
> > > > > >
> > > > > >
> > > > > > 24/07/2018 13:25, Thomas Monjalon:
> > > > > > > 23/07/2018 12:44, Jasvinder Singh:
> > > > > > > > Fix testpmd app exit by pressing ctrl+d,
> > > > > > > > End-of-Transmission character (EOT) on the empty command
> line.
> > > > > > >
> > > > > > > Please describe what is the issue and what is the cause.
> > > > > > >
> > > > > > > > Fixes: 0ad778b398c6 ("app/testpmd: rework softnic forward
> > > mode")
> > > > > > > >
> > > > > > > > Reported-by: Mordechay Haimovsky <motih@mellanox.com>
> > > > > > > > Signed-off-by: Jasvinder Singh <jasvinder.singh@intel.com>
> > > > > > > > ---
> > > > > > > > app/test-pmd/cmdline.c | 10 ++++++----
> > > > > > > > lib/librte_cmdline/cmdline.c | 2 +-
> > > > > > >
> > > > > > > It is very suspicious to change the cmdline library.
> > > > > > > If there is a bug in this library, it deserves a separate fix.
> > > > > >
> > > > > >
> > > >
> > > >
> > > > First, testpmd is not really broken, as only thing that changed is
> > > > the Ctrl +
> > > D behavior. I agree this is an issue that we need to fix, as
> > > > it looks that it is breaking some automation scripts for some people.
> > > >
> > > > The change in behavior for Ctrl + D exit is caused by replacing
> > > > the call to
> > > cmdline_interact() with calling cmdline_poll() in a loop.
> > > > These two approaches should be identical in behavior, but it looks
> > > > like they
> > > are not due to some issue in the cmdline library.
> > > > Jasvinder proposed a quick patch, but it looks like something else
> > > > needs to
> > > be fixed in cmdline library in order to bring
> > > > cmdline_poll() on parity with cmdline_interact(). Any advice from
> > > > Olivier
> > > would be very much appreciated!
> > > >
> > > > It is really a bad practice to use cmdline_interact() in testpmd,
> > > > as it is a
> > > blocking call that prohibits doing other things on the same
> > > > thread that runs the CLI. Sometimes we need to run other things on
> > > > the
> > > same core, e.g. the slow softnic_manage() function.
> > >
> > > Curious why not use a service core for softnic background stuff, and
> > > leave CLI one for CLI?
> > > Konstantin
> >
> > I guess for a test application you can do anything you want, but in
> > real life CPU cores are really expensive and dedicating a CPU core just for
> CLI is a colossal waste.
>
> Ok, but let's application developer to decide how to use (waste) the cores he
> owns :) What I am saying: there is a special thing (developed by Harry)
> service cores.
> As I understand why of it's the purpose - allow PMD(s) to allocate CPU
> resources for there background tasks in a unified and transparent way.
> From the description above - that seems to fit your needs (softnic
> background processing), no?
> Konstantin
>
> >
> > We did use the non-blocking cmdline_poll() function instead of the
> > blocking cmdline_interact() in the past without any issues. The issues
> > reported by Moti come as a surprise. It is probably good to see what this is
> about and see if we can quickly fix the issue in cmdline library. Otherwise, we
> can revert the usage of cmdline_poll() with cmdline_interact().
> >
> >
> > >
> > > >
> > > > Worst case scenario: We can revert the cmdline_poll() back to
> > > cmdline_interact(), this is a small change, but not the proper way
> > > of
> > > > doing things, as this is simply hiding the issue in cmdline
> > > > library. It would
> > > also prevent us from testing some Soft NIC functionality.
next prev parent reply other threads:[~2018-07-25 11:55 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-07-23 10:44 Jasvinder Singh
2018-07-24 9:25 ` Iremonger, Bernard
2018-07-24 11:25 ` Thomas Monjalon
2018-07-24 12:33 ` Thomas Monjalon
2018-07-24 12:39 ` Pattan, Reshma
2018-07-24 12:41 ` Iremonger, Bernard
2018-07-24 13:39 ` Thomas Monjalon
2018-07-24 14:37 ` Mordechay Haimovsky
2018-07-24 16:59 ` Dumitrescu, Cristian
2018-07-25 8:18 ` Thomas Monjalon
2018-07-25 8:30 ` Singh, Jasvinder
2018-07-25 8:49 ` Dumitrescu, Cristian
2018-07-25 8:53 ` Mordechay Haimovsky
2018-07-25 9:04 ` Ananyev, Konstantin
2018-07-25 9:36 ` Dumitrescu, Cristian
2018-07-25 11:39 ` Ananyev, Konstantin
2018-07-25 11:55 ` Mordechay Haimovsky [this message]
2018-07-25 11:56 ` Dumitrescu, Cristian
2018-07-25 12:18 ` Ananyev, Konstantin
2018-07-25 12:27 ` Van Haaren, Harry
2018-07-25 13:21 ` Dumitrescu, Cristian
2018-07-25 12:41 ` Dumitrescu, Cristian
2018-07-25 13:34 ` Ananyev, Konstantin
2018-07-24 14:17 ` [dpdk-dev] [PATCH v2] app/testpmd: fix testpmd exit for ctrl+d Reshma Pattan
2018-07-24 14:46 ` Pattan, Reshma
2018-07-24 15:31 ` Pattan, Reshma
2018-07-24 15:31 ` Iremonger, Bernard
2018-07-26 14:14 ` Thomas Monjalon
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