On Tue, Oct 5, 2010 at 10:10 PM, Josh Blum <j...@joshknows.com> wrote: > Can you benchmark your hard disk for sustained rate? > > I don't think that most disks, even SSD,s can sustain a write rate of 25Msps > @ 4 bytes a sample (if you are capturing shorts) = 100MB/s > > -Josh > > On 10/05/2010 06:35 PM, Thomas Hobiger wrote: >> >> Hi everybody, >> >> I am running a USRP2 with a DBSRX and talking to the hardware via raw >> ethernet. Running GRC goes well (e.g. doing a real-time FFT spectrum), >> but when I start recording on disc I get many "S" messages ("2 >> successive packets which do not have 2 successive sequence numbers") >> after about 10 seconds. I am currently sampling with a decimation of 4, >> but the problem remains with other decimation factors as wekk, just the >> messages show up slightly delayed. I think the HD itself is not the >> reason as I am recording to a 80 GB SSD, which has EXT4 and is mounted >> in a quite fast mode (I have benchmarked the I/O giving me much more >> bandwidth than what streams in from the USRP2). >> I have started to modify parts of the GNURADIO code, but changing buffer >> sizes does not help much. >> >> Is there anybody who experienced similar troubles? >> >> Regards, >> Thomas Hobiger
Josh is probably right about this: sustained throughput at that rate to anything, even an SSD, is unlikely. Anecdotally, I found that JFS provided me with higher throughput, but only by a few % points, which I don't think is going to do it for you. Tom _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio