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Date:   Wed, 29 Nov 2017 11:51:14 -0500
From:   Willem de Bruijn <>
To:     Arnd Bergmann <>
Cc:     "David S. Miller" <>,
        Willem de Bruijn <>,
        Björn Töpel <>,
        Richard Cochran <>,
        Thomas Gleixner <>,
        Mike Maloney <>,
        Eric Dumazet <>,
        Kees Cook <>,
        Hans Liljestrand <>,
        Andrey Konovalov <>,
        "Rosen, Rami" <>,
        "Reshetova, Elena" <>,
        Sowmini Varadhan <>,
        Network Development <>,
        LKML <>
Subject: Re: [PATCH] [RFC v3] packet: experimental support for 64-bit timestamps

> Thanks for the review! Any suggestions for how to do the testing? If you have
> existing test cases, could you give my next version a test run to see if there
> are any regressions and if the timestamps work as expected?
> I see that there are test cases in tools/testing/selftests/net/, but none
> of them seem to use the time stamps so far, and I'm not overly familiar
> with how it works in the details to extend it in a meaningful way.

I could not find any good tests for this interface, either. The only
user of the interface I found was a little tool I wrote a few years
ago that compares timestamps at multiple points in the transmit
path for latency measurement [1]. But it may be easier to just write
a new test under tools/testing/selftests/net for this purpose. I can
help with that, too, if you want.


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