netdev - Re: [RFC PATCH 0/4] More accurate PHC<->system clock synchronization

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Date:   Tue, 30 Oct 2018 19:25:55 -0700
From:   Richard Cochran <richardcochran@...il.com>
To:     Miroslav Lichvar <mlichvar@...hat.com>
Cc:     netdev@...r.kernel.org, intel-wired-lan@...ts.osuosl.org,
        Jacob Keller <jacob.e.keller@...el.com>
Subject: Re: [RFC PATCH 0/4] More accurate PHC<->system clock synchronization

On Fri, Oct 26, 2018 at 06:27:38PM +0200, Miroslav Lichvar wrote:
> The other patches add support for the new ioctl to the e1000e, igb,
> and ixgbe driver. Tests with few different NICs in different machines
> (and PCIe slots) show that:
> - with an I219 (e1000e) the measured delay improved from 2500 to 1300 ns
>   and the error in the measured offset, when compared to cross
>   timestamping, was reduced by a factor of 5
> - with an I210 (igb) the delay improved from 5100 to 1700 ns
> - with an I350 (igb) the delay improved from 2300 to 750 ns
> - with an X550 (ixgbe) the delay improved from 1950 to 650 ns

Nice work!  This is a welcome improvement.

Thanks,
Richard