Re: [Discuss-gnuradio] S printouts and then either U printouts (and fails/stops transmitting) or seg fault with 4 USRPs

[Marcus D. Leech]

On 06/23/2016 10:33 PM, Ed Criscuolo wrote:
> Do you have four unique IP addresses assigned to the four USRPs?
> If they all have the same default address, this could cause the four
> packet streams to look like one stream, but the sequence numbers
> wouldn't track, hence the "SSSS"s.
>
> @(^.^)@  Ed
And deep confusion in general.

That's not just a USRP thing, but an IP networking thing in general....

> On 6/23/16 10:24 PM, Pavan Yedavalli wrote:
> > Just an update on this:
> >
> > I switched everything to a desktop with a dedicated ethernet port, and
> > connected all 4 USRPs to a switch, which is then directly connected via
> > ethernet to the computer. This has eliminated the Us, which means that
> > it is actually working decently (and not crapping out). Thanks to all
> > who advised with that. However, multiple Ss still get printed out at
> > basically every transmission. In addition, there are sometimes warnings
> > that say:
> >
> > SSSSSSSSSSS
> > UHD Error:
> >      Control packet attempt 0, sequence number 452:
> >      RuntimeError: no control response, possible packet loss
> >
> > This happens occasionally, but the Ss get printed out every time. While
> > it isn't blocking, since I am actually getting transmissions and it is
> > not crashing, I am still curious about how to solve this S problem.
> > Thanks again!
> >
> > --
> > Pavan
> >
> >
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>
>
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