From: Nikhil Jagtap <nikhil.jagtap@gmail.com>
To: "Ramia, Kannan Babu" <kannan.babu.ramia@intel.com>
Cc: "dev@dpdk.org" <dev@dpdk.org>
Subject: Re: [dpdk-dev] meter: excess token bucket update in srtcm
Date: Tue, 6 Sep 2016 11:59:39 +0530 [thread overview]
Message-ID: <CANKBMf3cFp5jb4-a1qdcEUcZ5aHnoQ=8Mo3yK-4aAFnO=P+dog@mail.gmail.com> (raw)
In-Reply-To: <682698A055A0F44AA47192B20141149762528A49@BGSMSX102.gar.corp.intel.com>
Hi Kannan,
Thank you for your reply. I will submit the patch on similar lines I had
used for my test.
Regards,
Nikhil
On 6 September 2016 at 10:40, Ramia, Kannan Babu <
kannan.babu.ramia@intel.com> wrote:
> Hi Nikhil
>
> You could submit a patch, something like that below logic
>
> If( ((n_periods * m->cir_bytes_per_period) > (m->cbs-m->tc))
> te = m->te + ((n_periods * m->cir_bytes_per_period) -
> (m->cbs-m->tc));
>
> and this should be done before m->tc update.
>
>
> Regards
> Kannan Babu
>
> -----Original Message-----
> From: dev [mailto:dev-bounces@dpdk.org] On Behalf Of Nikhil Jagtap
> Sent: Tuesday, September 6, 2016 9:43 AM
> To: Dumitrescu, Cristian <cristian.dumitrescu@intel.com>
> Cc: dev@dpdk.org
> Subject: Re: [dpdk-dev] meter: excess token bucket update in srtcm
>
> Hi,
> Can someone please comment on this?
>
> Nikhil
>
> On 31 August 2016 at 15:32, Nikhil Jagtap <nikhil.jagtap@gmail.com> wrote:
>
> > Hi,
> >
> > As per srTCM RFC 2697, we should be updating the E bucket only after
> > the C bucket overflows.
> > "Thereafter, the token counts Tc and Te are updated CIR times per
> > second as follows:
> > o If Tc is less than CBS, Tc is incremented by one, else
> > o if Te is less then EBS, Te is incremented by one, else
> > o neither Tc nor Te is incremented."
> >
> > However in the current DPDK implementation of srTCM, we are updating
> > both the buckets simultaneously at the same rate (CIR). This will
> > result in a token accumulation rate of (2*CIR). This seems like a bug
> > to me. Can you confirm this?
> >
> > Nikhil
> >
> >
>
next prev parent reply other threads:[~2016-09-06 6:29 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-08-31 10:02 Nikhil Jagtap
2016-09-06 4:13 ` Nikhil Jagtap
2016-09-06 5:10 ` Ramia, Kannan Babu
2016-09-06 6:29 ` Nikhil Jagtap [this message]
2016-09-06 9:56 ` Dumitrescu, Cristian
2016-09-07 6:22 ` Nikhil Jagtap
2016-09-09 21:00 ` Dumitrescu, Cristian
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