netdev - Re: [PATCH v6 net-next 0/4] PHC support in ENA driver

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Message-ID: <72458ccc-9c18-4c95-8506-de4951851af7@machnikowski.net>
Date: Tue, 11 Feb 2025 08:58:30 +0100
From: Maciek Machnikowski <maciek@...hnikowski.net>
To: Jakub Kicinski <kuba@...nel.org>,
 Vadim Fedorenko <vadim.fedorenko@...ux.dev>
Cc: David Arinzon <darinzon@...zon.com>, David Miller <davem@...emloft.net>,
 netdev@...r.kernel.org, Eric Dumazet <edumazet@...gle.com>,
 Paolo Abeni <pabeni@...hat.com>, Simon Horman <horms@...nel.org>,
 Richard Cochran <richardcochran@...il.com>,
 "Woodhouse, David" <dwmw@...zon.com>,
 Rahul Rameshbabu <rrameshbabu@...dia.com>, Gal Pressman <gal@...dia.com>
Subject: Re: [PATCH v6 net-next 0/4] PHC support in ENA driver



On 2/11/2025 1:46 AM, Jakub Kicinski wrote:
> On Sun, 9 Feb 2025 12:33:24 +0000 Vadim Fedorenko wrote:
>> Yes, we have seen this patchset, and we were thinking of how to
>> generalize error_bound property, which was removed from the latest
>> version unfortunately. But it's a good point to look at it once
>> again in terms of our prototype, thanks!
> 
> I was wondering whether they have a user space "time extrapolation
> component" which we should try to be compatible with. Perhaps they
> just expect that the user will sync system time.

error_bound has a different purpose - it tries to get the "baseline"
clock accuracy from the HW. The number returned here is needed to
calculate the uncertainty, not to extrapolate.

And yes - AFIK AWS suggests system time sync for EC2 instances [1]

[1]
https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/configure-ec2-ntp.html