Topic for #qi-hardware is now Copyleft hardware - http://qi-hardware.com | hardware hackers join here to discuss Ben NanoNote, atben / atusb 802.15.4 wireless, and other community driven hw projects | public logging at http://en.qi-hardware.com/irclogs
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<viric> can it be that the nanonote is faster than the raspberry pi (for non fp code, of course)
<viric> ?
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<larsc> I doubt it
<larsc> as far as I know the cpu freq of the rpi is twice that of the nanonote. And usually ARM is not a factor two slower than MIPS when it comes to instructions per clock cycle
<viric> ok
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<wpwrak> viric: did anyone make such a claim ? or was this just speculation ?
<viric> my speculation
<viric> I've seen the nanonote quite capable, and the pi a bit slow. But maybe I simply gave too different jobs to them
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<wpwrak> the display resolution may also make a difference. the ben has only a few pixels to move.
<larsc> yea, I have seen ben like hardware connected to a 800x600 display, it wasn't pretty ;)
<viric> I've been only compiling
<viric> I've 'openssl speed' numbers somewhere
<viric> of both.
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<DocScrutinizer05> compiling is 90% IO
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<DocScrutinizer05> IO in turn is massively depending on your actual hw design, like in "ZX81 computed during the VSYNC period of display only, other time the RAM been busy with video buffer readout"
<DocScrutinizer05> well, odd example since that's not even IO
<DocScrutinizer05> but anyway I guess you get the picture, regarding using a RAMdisk vs slow MMC flash storage raped by constant swapping and thus slowing down to <1 IOPS for real file access
<DocScrutinizer05> the latter commonly known as swap hell on e.g. Nokia N900
<DocScrutinizer05> compiler runs are *very* prone for running into swap hell on any architecture that has small amounts of RAM, compared to filesize of the compiled project
<DocScrutinizer05> -j 64 doesn't help either ;-)
<wpwrak> -j 64 at least makes the situation obvious ;-)
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<qi-bot> [commit] Werner Almesberger: libubb/: helper library for UBB access (master) http://qi-hw.com/p/ben-blinkenlights/2c52dac
<qi-bot> [commit] Werner Almesberger: swuart/: half-duplex software UART for UBB (WIP) (master) http://qi-hw.com/p/ben-blinkenlights/4689882
<qi-bot> [commit] Werner Almesberger: swuart/: use a hardware timer and allow full-duplex operation (master) http://qi-hw.com/p/ben-blinkenlights/8816dcf
<larsc> gpio uart?
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<wpwrak> yeah
<wpwrak> and in user space
<wpwrak> well, with the usual dirty tricks :)
<wpwrak> for example, i turn off interrupts while sending/receiving
<wpwrak> of course, it's not perfect. i.e., it has to be ready and polling when a new byte arrives. in a typical request-response dialog, that is normally no problem, but if you have fully independent operation, it would lose receive data
<wpwrak> what the full-duplex capability does is that it allows responses to begin while still sending. e.g., an echo or maybe in the future xon/xoff flow control
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<DocScrutinizer05> roh: you've been the rider or the driver of Rudi? ;-D
<roh> 'touristenscheisse'
<viric> DocScrutinizer05: hm yes, a lot of IO.
<DocScrutinizer05> roh: yup ;-P
<DocScrutinizer05> roh: nevertheless I seen two guys with hoods on a weird bike... Instantly thought of you and gismo, you both looked similar in a certain way on Camp
<DocScrutinizer05> ;-)
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<wpwrak> wolfspraul: btw, how about adding "antorcha" to the commit notifications on this channel ? http://projects.qi-hardware.com/index.php/p/antorcha/
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