On Saturday 21 July 2018 13:13:00 Mark Morgan Lloyd wrote:
> On 21/07/18 16:00, Gene Heskett wrote:
> > On Saturday 21 July 2018 10:20:02 Mark Morgan Lloyd wrote:
> >> I'd been comparing the performance of a Rockchip-based board's LAN
> >> and USB against an RPi3B+, results were satisfactory. There's a
> >> modicum of muttering that the 3B+ has broken something relating to
> >> the LAN or USB.
> >
> > I'm convinced its the internal usb2 hub that all i/o except the
> > radio and spi has to go thru. It has a rather annoying tendency to
> > throw away its own mouse and keyboard events. Thats not at all a
> > pleasant occurrance when the tossed event is a keyup, and it left
> > 1500 lbs of machinery moving with no stop except crashing into
> > something. OTOH, once code has been coaxed into a file, that file
> > can run that same machinery to do micron accurate work. The machine
> > control is thru spi, writing 32 bit packets at 41 megabaud, and
> > reading the responses 32 bits at a pop at 25 megabaud.
>
> The focus of people's ire ATM appears to be the RPi3B+, where the
> design has changed the chip that implements LAN and USB hub
> functionality. Over the last few days I've put a lot of time into this
> as the culmination of a ridiculous amount of routing/firewalling
> testing, and while I'd quite like to be able to accumulate more
> results what I can say so far is that while a TinkerBoard can receive
> a data stream over 1GBit/sec Ethernet and farm it out to at least
> three USB-connected 100MBit adapters before performance starts
> degrading, an RPi3B+ can only handle one and when a second is added
> performance is distributed unevenly... don't even dream of adding a
> third.
>
> The RPi range is good for what it was initially designed for, but that
> LAN/USB chip appears to be its weakness. I've not sought out a
> datasheet or worked my way through the kernel yet, but it looks as
> though there's some sort of prioritisation in there that can get out
> of kilter.
>
> Gene, is it one of these
> https://www.pine64.org/?product=rock64-media-board-computer that
> you're currently running to good effect?
>
Yes, the 4Gb version. But while it can build the latest (yesterdays
release) rt kernel in about 3 hours, I haven't figured out how to
install it yet. 220 megs uncompressed. But I'm trying to make pdfdocs,
and don't have enough of sphinx installed to get sphinx-build, according
to the make file error. Doing an install sphinx-* says everthing that
globs to is installed and current. Sigh. Finally got enough python and
perl installed that its making pdfdocs now, but that one hell of a bug
finder, missing xrefs by the megabyte.
And something is wrong with the locale, even a "dpkg-reconfigure locale"
cannot create the locale vars needed. Getting a 9 line complaint from
perl for every file processed. I was able to fix the paper size to
letter from a default of A4 before I started making the docs in pdf.
When it gets done, maybe I'll learn something? It must be generating
quite a few gigabytes of pdf's.
And I have laundry to tend to, back later, its been munching on media-tex
for about 15 minutes now, with 3 screens worth of included files.
And just bailed out with a weird message:
build succeeded, 41 warnings.
make PDFLATEX=xelatex LATEXOPTS="-interaction=batchmode" -C
Documentation/output/./latex || exit;
xelatex -interaction=batchmode 'userspace-api.tex'
This is XeTeX, Version 3.14159265-2.6-0.99996 (TeX Live 2016/Debian)
(preloaded format=xelatex)
restricted \write18 enabled.
entering extended mode
Makefile:66: recipe for target 'userspace-api.pdf' failed
make[2]: *** [userspace-api.pdf] Error 1
Documentation/Makefile:85: recipe for target 'pdfdocs' failed
make[1]: *** [pdfdocs] Error 2
Makefile:1523: recipe for target 'pdfdocs' failed
make: *** [pdfdocs] Error 2
Damn! Why the heck can't it say why?
Sigh.
> Remainder noted with interest.
--
Cheers, Gene Heskett
--
"There are four boxes to be used in defense of liberty:
soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author)
Genes Web page <http://geneslinuxbox.net:6309/gene>