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Re: [Discuss-gnuradio] USRP2 spontaneously dies while transmitting
From: |
Andrew Lutomirski |
Subject: |
Re: [Discuss-gnuradio] USRP2 spontaneously dies while transmitting |
Date: |
Tue, 4 Aug 2009 19:44:21 -0400 |
On Tue, Aug 4, 2009 at 6:05 PM, Eric Blossom<address@hidden> wrote:
>
> You're running it through a switch. We tell you not to do that.
> Your switch is probably declining to be flow controlled by the USRP2,
> hence there's no back pressure being applied to the host, thus the
> unbounded amount of data sent from the host.
>
> Rule 1: Don't connect your USRP2 via a switch
>
> Rule 2: If you think you know what you're doing and understand the ins
> and outs of ethernet PAUSE frames and asymmetric flow control,
> and can get your switch to accept flow control from the USRP,
> then it _may_ be possible to make it work through a switch.
>
> Rule 3: See Rule 1.
Would you accept a patch to error out on send if sustained data rates
more than, say, 150% of what they should be are seen?
Also, I fully expect (and don't mind) some drops due to running
through a switch. I'm only running this thing when the network is
otherwise nearly idle and even then I'm at high interpolation. It
still seems buggy that the USRP2 crashes as a result.
Is the USRP2 ethernet protocol documented somewhere? Quick googling
didn't find it.
--Andy
>
>
>> > Do you have the TTL serial port on the USRP2 connected? If so, what
>> > was the last thing it said?
>>
>> Nope. I might try that eventually, but I probably won't get a chance
>> for a week or two.
>
> Eric
>
Re: [Discuss-gnuradio] USRP2 spontaneously dies while transmitting, Eric Blossom, 2009/08/04