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

[Keller, J. E <jac...@in...>]

> -----Original Message-----
> From: Richard Cochran [mailto:ric...@gm...]
> Sent: Tuesday, October 30, 2012 10:45 AM
> To: Keller, Jacob E
> Cc: lin...@li...
> Subject: Re: [Linuxptp-users] Fw: “Resource temporarily unavailable”
> errors during flood ping test
> 
> > I like the idea of architecting it to use select and a delay value,
> > so I'll try to see how difficult that would be.
> 
> Be my guest ;)
> 
> I tried once to fixup ptpd like this, and I didn't get very far.
> 

You're right. I looked at implementing it and to make it work we really need to
have select only check on the errqueue which it doesn't seem to be able to do...

It would take an insane amount of work to move to a model that allows receive handling inside sk.c, and I believe it isn't worth the effort. I would however like to increase the default tx_timestamp_retries value, as 2 tries rarely works for anything I've tested, as it generates false positive errors a lot. What hardware are you using that doesn't have issues at 2 retries? And have you attempted testing this under moderate stress?

I also like the idea of using CLOCK_MONOTONIC as a "timeout" seems to make more user-sense than a tx_retries as the user will more likely understand what is intended vs the tx_timestamp_retries which might be confusing.

Thanks

- Jake

> Thanks,
> Richard