Re: [Discuss-gnuradio] kernel freeze during continuous transmission using USRP2

[Jung Il Choi]

There's no switch between the machine and USRP2.
I did ethtool, and it was on for all three. When TX is disabled, strangely I am 
seeing a slower speed leaving some gaps between signals. 

Thanks!

Jung Il

----- "Eric Blossom" <address@hidden> wrote:

> On Mon, Dec 21, 2009 at 03:31:23PM -0800, Jung Il Choi wrote:
> > Hi,
> > 
> > I am using ucla-zigbee stack for continuously transmitting a fixed
> > symbol (all zeroes) for 802.15.4.
> > I finally made it to work on USRP2 with RFX2400, but now my
> > machine's kernel freezes after 5~10 minutes (even no ping
> > responses). Basically, using sig_source I generate a stream of a
> > constant 0's, and feed it to 802.15.4 modulator to transmit O-QPSK
> > signal.
> > 
> > When I do packetized transmissions once a second, I do not see the
> > freezing problem. I only see this when I continuously transmit.
> > 
> > Does anyone has any clue/suggestion? I am using Ubuntu 8.04 with
> the
> > kernel 2.6.24-21, and using D-Link DGE-560T gigabit pci-express
> > adapter.
> > Thanks,
> > Jung Il Choi
> 
> Is there a switch between your machine and the USRP2?
> 
> If you type 
> 
>   $ ethtool -a eth0
> 
> what does it display? (assuming eth0 is the interface the usrp2 is
> connected to)
> 
> I would expect:
> 
>   $ ethtool -a eth1
>   Pause parameters for eth1:
>   Autonegotiate:  on
>   RX:             on
>   TX:             off
> 
> 
> Eric