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[Discuss-gnuradio] Feisty FieldRat lowlatency upgrades


From: Robert McGwier
Subject: [Discuss-gnuradio] Feisty FieldRat lowlatency upgrades
Date: Sat, 28 Apr 2007 14:43:41 -0400
User-agent: Thunderbird 1.5.0.10 (Windows/20070221)

In Ubuntu Feisty Fawn, if you do synaptic, search for lowlatency, you will see that it is utterly trivial to install and use the lowlatency enhanced kernel. It installs a new image, modifies the grub menu, and both Frank and I have experienced the same improvement in low latency performance using jack. I have on my two SMP machines, and my laptop, and Frank on his abacus (2 GHz celeron). Both of us have been able to set ridiculously small buffer sizes in jack. I was able to do this successfully with the Edirol FA-66 and Freebob/Firewire as well as my Delta 44.

So far,  I have done 4 Feisty Fawn upgrades using

gksu "update-manager -c -d"

and all have gone seamlessly. In each case, there were a couple of things that would show up in the "unchanged" listing in the synaptic upgrade/install dialog. A review of these through search revealed that in every case, Ubuntu had erred on the side of caution and left it up to me the user to decide if I wanted to upgrade things which required library upgrades.

I am quite impressed so far and even more impressive is it finding a four year old bug in the USRP code! (Okay, well, it only took the kernel 4 years to catch up but there had to be a first right?).

Bob

--
AMSAT Director and VP Engineering. Member: ARRL, AMSAT-DL,
TAPR, Packrats, NJQRP, QRP ARCI, QCWA, FRC. ARRL SDR WG Chair
"If you're going to be crazy, you have to get paid for it or
else you're going to be locked up." Hunter S. Thompson




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