[dpdk-users] MLX5 Rx HW Timestamp units

[dpdk-users] MLX5 Rx HW Timestamp units

[Anshu Boonapalli]

Anyone know the units of Rx HW timestamps MLX5 provides?

I assumed nanoseconds but tests i have run don't match the nanosecond units.

Thanks,
-Anshu

Re: [dpdk-users] MLX5 Rx HW Timestamp units

[Tom Barbette]

Hi Anshu,

No it's the value of an internal Clock. The frequency and the base are both unknown.

We have a patch that works (but must be reworked before submission to dev) that allows to query the current device clock value. Then from there you can derive the base and the frequency. I can send it to you if you wish.

Tom
________________________________________
De : users <users-bounces@dpdk.org> de la part de Anshu Boonapalli <anshu.boonapalli@gmail.com>
Envoyé : mardi 27 novembre 2018 02:41
À : users@dpdk.org
Objet : [dpdk-users] MLX5 Rx HW Timestamp units

Anyone know the units of Rx HW timestamps MLX5 provides?

I assumed nanoseconds but tests i have run don't match the nanosecond units.

Thanks,
-Anshu

Re: [dpdk-users] MLX5 Rx HW Timestamp units

[Anshu Boonapalli]

hi Tom,

Thanks for clarifying.

I am interested in the patch that allows the query of the current device
clock values. Please point me to this patch.

-Anshu

On Tue, Nov 27, 2018 at 12:57 AM Tom Barbette <barbette@kth.se> wrote:

> Hi Anshu,
>
> No it's the value of an internal Clock. The frequency and the base are
> both unknown.
>
> We have a patch that works (but must be reworked before submission to dev)
> that allows to query the current device clock value. Then from there you
> can derive the base and the frequency. I can send it to you if you wish.
>
> Tom
> ________________________________________
> De : users <users-bounces@dpdk.org> de la part de Anshu Boonapalli <
> anshu.boonapalli@gmail.com>
> Envoyé : mardi 27 novembre 2018 02:41
> À : users@dpdk.org
> Objet : [dpdk-users] MLX5 Rx HW Timestamp units
>
> Anyone know the units of Rx HW timestamps MLX5 provides?
>
> I assumed nanoseconds but tests i have run don't match the nanosecond
> units.
>
> Thanks,
> -Anshu
>

Re: [dpdk-users] MLX5 Rx HW Timestamp units

[Tom Barbette]

You actually motivated me to finish re-writing the patch... I just sent it to the dev mailing list. You'll also find the 3 commits there : https://github.com/tbarbette/dpdk/tree/mlxclock


Tom

________________________________
De : Anshu Boonapalli <anshu.boonapalli@gmail.com>
Envoyé : mardi 27 novembre 2018 16:36
À : Tom Barbette
Cc : users@dpdk.org
Objet : Re: [dpdk-users] MLX5 Rx HW Timestamp units

hi Tom,

Thanks for clarifying.

I am interested in the patch that allows the query of the current device clock values. Please point me to this patch.

-Anshu

On Tue, Nov 27, 2018 at 12:57 AM Tom Barbette <barbette@kth.se<mailto:barbette@kth.se>> wrote:
Hi Anshu,

No it's the value of an internal Clock. The frequency and the base are both unknown.

We have a patch that works (but must be reworked before submission to dev) that allows to query the current device clock value. Then from there you can derive the base and the frequency. I can send it to you if you wish.

Tom
________________________________________
De : users <users-bounces@dpdk.org<mailto:users-bounces@dpdk.org>> de la part de Anshu Boonapalli <anshu.boonapalli@gmail.com<mailto:anshu.boonapalli@gmail.com>>
Envoyé : mardi 27 novembre 2018 02:41
À : users@dpdk.org<mailto:users@dpdk.org>
Objet : [dpdk-users] MLX5 Rx HW Timestamp units

Anyone know the units of Rx HW timestamps MLX5 provides?

I assumed nanoseconds but tests i have run don't match the nanosecond units.

Thanks,
-Anshu

Re: [dpdk-users] MLX5 Rx HW Timestamp units

[Anshu Boonapalli]

Thank you very much Tom!

Do you know if your work is portable to DPDK 17.11 tip? If not, i will look
into the move to 18.11.

-Anshu

On Wed, Nov 28, 2018 at 3:01 AM Tom Barbette <barbette@kth.se> wrote:

> You actually motivated me to finish re-writing the patch... I just sent it
> to the dev mailing list. You'll also find the 3 commits there :
> https://github.com/tbarbette/dpdk/tree/mlxclock
>
>
> Tom
> ------------------------------
> *De :* Anshu Boonapalli <anshu.boonapalli@gmail.com>
> *Envoyé :* mardi 27 novembre 2018 16:36
> *À :* Tom Barbette
> *Cc :* users@dpdk.org
> *Objet :* Re: [dpdk-users] MLX5 Rx HW Timestamp units
>
> hi Tom,
>
> Thanks for clarifying.
>
> I am interested in the patch that allows the query of the current device
> clock values. Please point me to this patch.
>
> -Anshu
>
> On Tue, Nov 27, 2018 at 12:57 AM Tom Barbette <barbette@kth.se> wrote:
>
>> Hi Anshu,
>>
>> No it's the value of an internal Clock. The frequency and the base are
>> both unknown.
>>
>> We have a patch that works (but must be reworked before submission to
>> dev) that allows to query the current device clock value. Then from there
>> you can derive the base and the frequency. I can send it to you if you wish.
>>
>> Tom
>> ________________________________________
>> De : users <users-bounces@dpdk.org> de la part de Anshu Boonapalli <
>> anshu.boonapalli@gmail.com>
>> Envoyé : mardi 27 novembre 2018 02:41
>> À : users@dpdk.org
>> Objet : [dpdk-users] MLX5 Rx HW Timestamp units
>>
>> Anyone know the units of Rx HW timestamps MLX5 provides?
>>
>> I assumed nanoseconds but tests i have run don't match the nanosecond
>> units.
>>
>> Thanks,
>> -Anshu
>>
>