Are you taking full advantage of the multi threading now available? Are you running a 64 bit version of Linux?
Have you tried compiling GnuRadio with the following flags? -O3 -msse -msse3 -mfpmath=sse The gain from the multiple cores is that more threads get "two thirds of processor" making the aggregate faster but NOT necessarily the single threads. Bob ARRL SDR Working Group Chair Member: ARRL, AMSAT, AMSAT-DL, TAPR, Packrats, NJQRP, QRP ARCI, QCWA, FRC. "And yes I said, yes I will Yes", Molly Bloom -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Marcus D. Leech Sent: Wednesday, December 10, 2008 1:22 PM To: GNURadio Discussion List Subject: [Discuss-gnuradio] Upgrade (downgrade?) to a Q6600 CPU I've been running my radio astronomer receiver software for a couple of years on a Dual-core Pentium P25 CPU, with 2GB of 533 Ram, with the CPU clocked at 3.2Ghz. This has allowed me to do 8Mhz dual-polarization continuum and spectrum, with very few overruns (uOuOuO) I "upgraded" this system to a Quad-core Q6600, with 4Gb of 667Mhz ram. It's only able to do 4.5Mhz in situations where the previous system could handle 8Mhz. This is, of course, a big disappointment, since I was hoping that multiple cores would increase the ability for me to add more complex signal processing, but maintain the same bandwidth as the old system. Apart from the obvious hardware upgrades (move to a MOBO that can overclock the Q6600 into the 3Ghz region, and use dual-channel RAM), are there software tweaks (I'm thinking particularly of USB buffering or something) that would allow me to get better performance, without overruns? Note that I'm using the latest trunk code, as of a few days ago. -- Marcus Leech Principal Investigator, Shirleys Bay Radio Astronomy Consortium http://www.sbrac.org _______________________________________________ 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
