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Re: [Discuss-gnuradio] New implementation for fusb_linux withoutallocs/f
From: |
Marcus D. Leech |
Subject: |
Re: [Discuss-gnuradio] New implementation for fusb_linux withoutallocs/frees |
Date: |
Tue, 24 Feb 2009 13:07:34 -0500 |
User-agent: |
Thunderbird 2.0.0.19 (X11/20090105) |
Eric Blossom wrote:
> Marcus, in my experience, USB performance has not be limited by cpu
> cycles. It seems to be primarily a function of the design of the host
> controller, the firmware in the device, and a reasonable way to get
> the data into user mode. In most apps I've benchmarked, the overhead
> of all usrp related stuff is typically on the order of 5 to 10% of the
> total cycles consumed.
>
> Eric
>
>
OK, so improving total USB cycle counts in user mode from 10% to 5%
perhaps wouldn't noticeably improve
things like overruns--is that what you're saying?
So, in your experience what is the sh*t-hottest USB controller out
there, and is it available on a PCI or PCI-E card?
--
Marcus Leech
Principal Investigator, Shirleys Bay Radio Astronomy Consortium
http://www.sbrac.org