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From: "Singh, Jasvinder" <jasvinder.singh@intel.com>
To: Thomas Monjalon <thomas@monjalon.net>,
	satish amara <satishkamara@gmail.com>
Cc: "users@dpdk.org" <users@dpdk.org>,
	"Dumitrescu, Cristian" <cristian.dumitrescu@intel.com>
Subject: RE: Fwd: QOS sample example.
Date: Thu, 31 Mar 2022 20:28:00 +0000
Message-ID: <CY4PR11MB15896DBC9D5FBB226D56AE5AE0E19@CY4PR11MB1589.namprd11.prod.outlook.com> (raw)
In-Reply-To: <10708365.BaYr0rKQ5T@thomas>



> -----Original Message-----
> From: Thomas Monjalon <thomas@monjalon.net>
> Sent: Thursday, March 31, 2022 8:39 PM
> To: satish amara <satishkamara@gmail.com>
> Cc: users@dpdk.org; Singh, Jasvinder <jasvinder.singh@intel.com>;
> Dumitrescu, Cristian <cristian.dumitrescu@intel.com>
> Subject: Re: Fwd: QOS sample example.
> 
> +Cc QoS scheduler maintainers (see file MAINTAINERS)
> 
> 31/03/2022 18:59, satish amara:
> > Hi,
> >     I am trying to understand the QOS sample scheduler application code.
> > Trying to understand what is tc_period in the config.
> > 30. QoS Scheduler Sample Application — Data Plane Development Kit
> > 21.05.0 documentation (dpdk.org)
> > <https://doc.dpdk.org/guides-
> 21.05/sample_app_ug/qos_scheduler.html>
> > Is tc_period same as  tb_period tb_period Bytes Time period that
> > should elapse since the last credit update in order for the bucket to
> > be awarded tb_credits_per_period worth or credits.
> > Regards,
> > Satish Amara
> >

tc_period and tb_period are different. TC period is related to pipe tc rate limiting mechanism while tb period relates to traffic shaping mechanism (token bucket) implemented at pipe level.  tc_period represents the time interval to compute pipe TC credits (bytes). In each interval (tc_period value), credits are initialised to a fixed value. It is configurable parameter and should be carefully selected to avoid deadlock situation which arises when number of pipe TC credits (computed using tc_period) is smaller than the MTU. Please refer  https://doc.dpdk.org/guides/prog_guide/qos_framework.html for more details.

      parent reply	other threads:[~2022-03-31 20:28 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-03-29 20:20 satish amara
2022-03-31 16:59 ` Fwd: " satish amara
2022-03-31 19:39   ` Thomas Monjalon
2022-03-31 20:26     ` satish amara
2022-04-01  8:36       ` Singh, Jasvinder
2022-04-01 13:34         ` satish amara
2022-04-06 15:32           ` satish amara
2022-04-06 16:34             ` Singh, Jasvinder
2022-04-06 18:06               ` satish amara
2022-04-07 17:29                 ` Singh, Jasvinder
2022-04-11 17:19                   ` satish amara
2022-03-31 20:28     ` Singh, Jasvinder [this message]

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