Vincenzo Pellegrini wrote: > Hi everybody, > > just a quick question: has anybody managed so far to provide the usrp > with the 8 Complex Msps needed to transmit an 8 MHz wide band? > > My problem is that such a bandwidth yields a 32MiBps throughput and, > even if the USB2 bus and the CPU speed of my machine are all right with > this, it looks like my IDE HARD DISK cannot provide such a data rate. > > Can anyone please confirm whether he's been successful in something > similar, and, if so, with what kind of HD? > > thanks > > vincenzo If I have to read/send signals I can't process in realtime I allways do one of the following.
Small files: use a ramdisk Big files: use a dedicated partition at the very start of the drive, formatted with a fast filesystem (non-journalling) with nothing further on it. I have a 2.5 GB fat32 partition at the start of my drive (/dev/hda1). For RX this can just keep up with 32 MiB/sec. For TX I never have been able to get more then 16 MiB/sec, even when using a ramdisk or using a null_source. I don't know why there is a difference between TX and RX. Maybe there is a subtle buffering, timing or other difference in the communication with the usrp. Has anobody else have been able to do more then 16 MiB/sec on the TX side? Greetings, Martin > > > > > _______________________________________________ > Discuss-gnuradio mailing list > Discuss-gnuradio@gnu.org > http://lists.gnu.org/mailman/listinfo/discuss-gnuradio > _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
