Re: [Linuxptp-users] Fw: “Resource temporarily unavailable” errors during flood ping test

[Richard C. <ric...@gm...>]

On Tue, Oct 30, 2012 at 09:54:30AM -0700, Jacob Keller wrote:
> 
> I believe the true correct answer is to completely re-architect the 
> tx_hwtstamp to be asynchronous, so that it just waits until it receives 
> the timestamp for a complete sequence of events. That design is 
> significantly more difficult to write though.

But even if we did that way, it would not really be a better
solution. Think about your own Intel cards. They would end up missing
Tx time stamps and possibly mixing them up due to the hardware
limitation of having a Tx time stamp FIFO of depth one.

And it is not just Intel cards that have this issue. I think the
majority of the current hardware offerings all have this same
limitation.  So we really must wait for the Tx time stamp after
sending an event message before going on with the protocol, simply
to function on most of the hardware out there.

Thanks,
Richard