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[Discuss-gnuradio] Testing USRP2 on 6-core Phenom II X6 server

From: Marcus D. Leech
Subject: [Discuss-gnuradio] Testing USRP2 on 6-core Phenom II X6 server
Date: Mon, 28 Jun 2010 18:16:48 -0400
User-agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv: Gecko/20100430 Fedora/3.0.4-2.fc12 Thunderbird/3.0.4

I took delivery on a server (well, the parts to build a server, which I
did) about a week ago.  I've been
  running tests on it with USRP2.

It's a Gigabyte GA880GM-UD2H motherboard, with 8G of 1333 DDR3 memory,
and a AMD Phenom II 1090T,
  six-core CPU at 3.2GHz.

I'm running Fedora 12 x86_64, with the latest Gnu Radio GIT.

I was able to run usrp2_fft.py with decim=4 (25Msps!!) after increasing
the net.core.rmem_max and
  net.core.wmem_max parameters to 500000 each.

With this configuration, usrp2_fft.py consumes about 25% of the
available CPU, or roughly 1.5 of the 6 CPUs
  of the system.

Marcus Leech
Principal Investigator
Shirleys Bay Radio Astronomy Consortium

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