Hi Marcus, I've got a 10 Gigabit interface. The packet length is 5760 IQ samples and the sampling rate is 5.76 MHz.
These sequence of 1 ms long packets happen very often. For example, I might receive ten or more 1ms long packets that have to be transmitted at t0, t0+1ms, t0+2ms, ...., t0+9ms. I don't know how the FPGA part of the USRP works, but could the FPGA processing, after transmitting one packet, be long enough so that the next timestamp (of the next packet) is already in the past and then it outputs "L"? Thanks, Felipe Em seg, 2 de jul de 2018 5:57 PM, Marcus Müller <marcus.muel...@ettus.com> escreveu: > I must admit it's been a while, but I remember building a system with > an RX/TX roundtrip time through the host of about 5ms using gigabit > ethernet and relatively small packets. > > What's your interface, what's the packet size you're using, and at > which sampling rate? > > Also, how often do these burst happen? Maybe we're seeing a problem > getting control flow done fast enough. > > Best regards, > Marcus > > On Mon, 2018-07-02 at 21:55 +0200, Felipe Augusto Pereira de Figueiredo > wrote: > > Hi Marcus, > > > > It is a x310 and we tried with different number of milliseconds in > > advance, we started with 2 ms in advance and went to 7 ms. > > > > Thanks and Kind Regards, > > > > Felipe > > > > On Mon, Jul 2, 2018 at 9:48 PM, Marcus Müller <marcus.mueller@ettus.c > > om> wrote: > > > Hi Felipe, > > > > > > which USRP are we talking about? > > > and: how much in advance to the time of transmission do you send > > > your > > > packet to the USRP? > > > > > > Best regards, > > > Marcus > > > > > > On Mon, 2018-07-02 at 16:37 +0200, Felipe Augusto Pereira de > > > Figueiredo > > > via USRP-users wrote: > > > > Dear All, > > > > > > > > I've got the following problem: > > > > > > > > I transmit one 1 ms long packet at a specific time, lets say t0. > > > I > > > > also use SOB and EOB to delimit the packets. > > > > > > > > What I want to do is to transmit the next 1 ms long packet at > > > t0+1ms, > > > > however, I'm seeing "L" being printed in the log, meaning the > > > packet > > > > is late. > > > > > > > > To summarize, I have a scheduler that works for slots of 1 ms and > > > I > > > > would like to have the packets being transmitted in sequence when > > > I > > > > have then with timestamps 1 ms apart from each other. > > > > > > > > Is it possible? > > > > > > > > Thanks and Kind regards, > > > > > > > > Felipe Augusto > > > > > > > > > > > > _______________________________________________ > > > > USRP-users mailing list > > > > USRP-users@lists.ettus.com > > > > http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.co > > > m > > > > >
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