From mboxrd@z Thu Jan 1 00:00:00 1970 MIME-Version: 1.0 In-Reply-To: <7aa1f8ae5b628668@orthanc.ca> References: <7aa1f8ae5b628668@orthanc.ca> From: hiro <23hiro@gmail.com> Date: Wed, 10 Oct 2018 07:52:28 +0200 Message-ID: To: Fans of the OS Plan 9 from Bell Labs <9fans@9fans.net> Content-Type: text/plain; charset="UTF-8" Subject: Re: [9fans] PDP11 (Was: Re: what heavy negativity!) Topicbox-Message-UUID: eab4eeda-ead9-11e9-9d60-3106f5b1d025 > Eliminating as much of the copy in/out WRT the kernel cannot but > help, especially when you're doing SDR decoding near the radios > using low-powered compute hardware (think Pies and the like). Does this include demodulation on the pi? cause even when i dumped the pi i was given for that purpose (with a <2Mbit I/Q stream) and replaced it with some similar ARM platform that at least had neon cpu instruction extensions for faster floating point operations, I was barely able to run a small FFT. My conclusion was that these low-powered ARM systems are just good enough for gathering low-bandwidth, non-critical USB traffic, like those raw I/Q samples from a dongle, but unfit for anything else.