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From: Slava Ovsiienko <viacheslavo@mellanox.com>
To: PATRICK KEROULAS <patrick.keroulas@radio-canada.ca>
Cc: "dev@dpdk.org" <dev@dpdk.org>,
	Vivien Didelot <vivien.didelot@gmail.com>,
	 Shahaf Shuler <shahafs@mellanox.com>,
	Raslan Darawsheh <rasland@mellanox.com>,
	Matan Azrad <matan@mellanox.com>
Subject: Re: [dpdk-dev] mlx5 & pdump: convert HW timestamps to nanoseconds
Date: Fri, 5 Jun 2020 16:30:07 +0000	[thread overview]
Message-ID: <AM4PR05MB32653023479E4F529F8A5E89D2860@AM4PR05MB3265.eurprd05.prod.outlook.com> (raw)
In-Reply-To: <CALEF-=APTLw8y-2E8Tj=NRcXvgDEqUm8t-BYcGB8ZBc9Jtz53g@mail.gmail.com>

> -----Original Message-----
> From: PATRICK KEROULAS <patrick.keroulas@radio-canada.ca>
> Sent: Friday, June 5, 2020 3:10
> To: Slava Ovsiienko <viacheslavo@mellanox.com>
> Cc: dev@dpdk.org; Vivien Didelot <vivien.didelot@gmail.com>; Shahaf
> Shuler <shahafs@mellanox.com>; Raslan Darawsheh
> <rasland@mellanox.com>; Matan Azrad <matan@mellanox.com>
> Subject: Re: [dpdk-dev] mlx5 & pdump: convert HW timestamps to
> nanoseconds
> 
> On Wed, Jun 3, 2020 at 3:48 AM Slava Ovsiienko
> <viacheslavo@mellanox.com> wrote:
> >
> > > From: PATRICK KEROULAS <patrick.keroulas@radio-canada.ca>
> > > * rdma-code, libibverbs-dev: 28.0
> > > * NIC Part Number:      MCX516A-CDA_Ax
> > > * ConnectX-5 Ex EN
> > > * FW: 16.25.1020
> >
> > It looks like outdated firmware, please:
> > - update the firmware - at least 16.27.2008 is GA. I would recommend
> > to install OFED - it updates the FW
> > - make sure the UCTX_EN option in FW configuration is set to "true"
> 
> Hello Slava,
> 
> I managed to query device_frequency_khz by simply setting UCTX_EN=1,
> convert the mbuf->timestamp to nsec and write a pcap. However, the
> accuracy is quite disappointing, compared to libvma or even SW TS.
> 
> The freq value looks constant (=78125kHz). Correct me if I'm wrong, a ptp
> client is supposed to continuously adjust some kind of VCO on the NIC. And

AFAIK, it is not the case for ConnectX-5, no clock adjustment, just some free running counter.
ConnectX6DX  will provide an option of adjustable nanosecond UTC in timestamps.

> even setting a crazy value through /dev/ptp interface manually doesn't affect
> device_frequency_khz. Please could you clarify?
> 
> This leads me back to mlx5dv_clock_info->nsec. If this is a valid method, I
> think the only missing piece is to access it from the secondary process, which
> implies to share ibv_context.
> 
> Best Regards,
> 
> PK

      reply	other threads:[~2020-06-05 16:30 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-05-19 18:20 [dpdk-dev] mlx5 & pdump: convert HW timestamps to nanoseconds PATRICK KEROULAS
2020-05-21 15:33 ` Thomas Monjalon
2020-05-21 19:57   ` PATRICK KEROULAS
2020-05-21 20:09     ` Thomas Monjalon
2020-05-22 18:43       ` PATRICK KEROULAS
2020-05-26  7:44         ` Tom Barbette
2020-05-29 20:46           ` N. Benes
2020-05-26 16:00         ` Slava Ovsiienko
2020-05-29 20:56           ` PATRICK KEROULAS
2020-05-31 19:47             ` Slava Ovsiienko
2020-06-02 19:18           ` PATRICK KEROULAS
2020-06-03  7:48             ` Slava Ovsiienko
2020-06-05  0:09               ` PATRICK KEROULAS
2020-06-05 16:30                 ` Slava Ovsiienko [this message]

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