> -----Original Message-----
> From: Dale Smith <dalepsm...@gmail.com>
> Sent: Thursday, June 17, 2021 3:04 PM
> To: Joseph Matan <joseph.matan...@gmail.com>
> Cc: linuxptp-users@lists.sourceforge.net
> Subject: Re: [Linuxptp-users] Intel NICs PTP Performance Comparison
>
> So how in the would could *more* traffic cause a *smaller* delay?
>
EEE low power ethernet kicking in, which puts the device into a low power state
that has a higher latency to wake up. You could check "ethtool --show-eee" to
see if the device supports it and what the status is.
> Very curious.
>
> Wild Guess, maybe interrupt coalescing is going on, and with more
> packets, it's actually responding sooner?
This is unlikely, since timestamps are captured in hardware, so I don't think
it should impact the latency with regards to the actual timestamps.
>
> Another guess, that somehow the determination of the timestamps are
> just plain wrong. Like maybe they were fudged to some value while
> under heavy load, and are way more off when under light load?
>
I don't think this is the case for Intel devices.
> Just guesses as I said. I don't do 1588 much anymore, but this is
> very intriguing. Please report back if you ever get to the bottom of
> this.
>
> -Dale
>
>
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