This should be of interest on the devlist as well (that darn reply all button).
-------- Forwarded Message -------- Subject: Re: [Emc-developers] More better r-pi? Date: Fri, 14 Jul 2017 12:19:51 +0200 From: Bertho Stultiens <[email protected]> To: Gene Heskett <[email protected]> On 07/14/2017 07:56 AM, Gene Heskett wrote: > Giveing consideration to pre-ordering a pair of the rock64's from the > pine64 web site, $44.95 ea with 4 Gb of ram, the mali gpu-x2, Gigabit > ethernet, 2 usb2 and one usb3 port. Another $10 for usb3<->sata adaptor. > Ships the end of the month. > > I get the impression the hole it squirts data thru is considerable larger > than the pi's with its usb2 hole for everything. > > What do you think? It is a faster quad core than the Pi (1.6GHz vs 1.2GHz), but it depends on the support in the kernel how well it will perform in practice. The board is brand new and you probably see some pains at birth. The RockChip's SPI interface seems to be supported by a spidev driver, but how well it performs I do not know. However, the linuxcnc spidev driver does not support split read/write speeds, which will limit the overall performance to the read speed. This may be fixable, but needs a bit of thought. The actual performance will depend on many things and needs to be tested to tell a true story. I am guessing that there are some other optimizations that can/need to be performed, like anticipatory I/O scheduling, to press more performance out of these chips. But that would require to analyze a whole lot more than just the hardware I/O routines. Maybe some other developer can pitch in and say something about I/O scheduling as currently implemented in LCNC? -- Greetings Bertho (disclaimers are disclaimed) ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot _______________________________________________ Emc-developers mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-developers
