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OsmoDevCon 2024: "High-performance I/O using io_uring via osmo_io"
I've co-presented a talk (together with Andreas Eversberg High-performance I/O using io_uring via osmo_io as part of the OsmoDevCon 2024 conference on Open Source Mobile Communications.
Traditional socket I/O via read/write/recvfrom/sendto/recvmsg/sendmsg and friends creates a very high system call load. A highly-loaded osmo-bsc spends most of its time in syscall entry and syscall exit.
io_uring is a modern Linux kernel mechanism to avoid this syscall overhead. We have introduced the osmo_io`API to libosmocore as a generic back-end for non-blocking/asynchronous I/O and a back-end for our classic `osmo_fd / poll approach as well as a new backend for io_uring.
The talk will cover
a very basic io_uring...
Decapsulating the CH32V203 Reveals a Separate Flash Die
The CH32V203 is a 32bit RISC-V microcontroller. In the produt portfolio of WCH it is the next step up from the CH32V003, sporting a much higher clock rate of 144 MHz and a more powerful RISC-V core with RV32IMAC instruction set architecture. The CH32V203 is also extremely affordable, starting at around 0.40 USD (>100 bracket), depending on configuration.
An interesting remark on twitter piqued my interest: Supposedly the listed flash memory size only refers to a fraction that can be accessed with zero waitstate, while the total flash size is even 224kb. The datasheet indeed has a footnote claiming...
Cynthion Manufacturing Progress
Note: This is a crosspost of a Cynthion update on Crowd Supply: https://www.crowdsupply.com/great-scott-gadgets/cynthion/updates/cynthion-manufacturing-progress
Cynthion update time!
Final samples have been manufactured, some of them have been sent for RoHS testing (and each of them has passed), and manufacturing is under way. Everything’s going great so far, and we’re on track for June shipping!
Here is your first glimpse of finished Cynthions in their enclosures and in the boxes we will be shipping them in.
The significance of RoHS testing is that Cynthion had to pass that test in order for us to earn our CE marking, which allows us to sell Cynthion in the...
Introducing the Bantam Tools NextDraw™
Bantam Tools proudly unveils its latest advancement in proven plotter technology with the launch of the new Bantam Tools NextDraw series of drawing and handwriting machines. Engineered for artists, innovators, and educators seeking exceptional versatility and performance, Bantam Tools now offers a trio of new models designed for drawing and handwriting.
“The Evil Mad Scientist team have brought their engineering prowess to Bantam Tools and the new Bantam Tools NextDraw series are proven creative tools that set a new standard in plotters. The Bantam Tools NextDraw series of plotters are exceptional computer controlled machines for innovators.” says Bre Pettis, CEO...
Implementing Neural Networks on the “10-cent” RISC-V MCU without Multiplier
I have been meaning for a while to establish a setup to implement neural network based algorithms on smaller microcontrollers. After reviewing existing solutions, I felt there is no solution that I really felt comfortable with. One obvious issue is that often flexibility is traded for overhead. As always, for a really optimized solution you have to roll your own. So I did. You can find the project here and a detailed writeup here.
It is always easier to work with a clear challenge: I picked the CH32V003 as my target platform. This is the smallest...
Gradual migration of IP address/port between servers
I'm a strong proponent of self-hosting all your services, if not on your own hardware than at least on dedicated rented hardware. For IT nerds of my generation, this has been the norm sicne the early 1990s: If you wante to run your own webserver/mailserver/... back then, the only way was to self-host.
So over the last 30 years, I've always been running a fleet of machines, some my own hardware colocated, and during the past ~18 years also some rented dedicated "root servers". They run a plethora of services for either my personal stuff (like this blog, or my personal email server),...
Wuthering Bytes and OSHCamp Dates Confirmed, as the Call for Participation Opens
The dates for this year’s Wuthering Bytes festival and the Open Source Hardware Camp (OSHCamp) have been announced, with a call for participation now open.
This year the Wuthering Bytes festival will be taking place in Hebden Bridge from Friday the 23rd to Saturday the 31st of August inclusive – staring with the popular Festival Day on the Friday and then expanding to host additional events throughout the weekend.
These events include, as always, the Open Source Hardware Camp (OSHCamp), which will be taking place on the Saturday and Sunday as part of the wider festival schedule. The call for participation in...
KLayout and the Sky130 PDK
KLayout and Sky130: Inverter
I have created a small example of how to use KLayout for the layout of a simple inverter and run DRC and LVS for Sky130 in the hopes that it helps others on a similar journey.
You can find the repository with all files and a description in the klayout-sky130-inverter repository.
There are still some issues with the KLayout technology files so make sure to read the workarounds!
Good Luck 😉️
March Update: Making waves
Banner artwork: Caffeine New products in development Authors: Ralim, gamiee
As probably one of the most anticipated sections of the blog, we can confirm that there are more new products in the pipeline.
The first two were shown at the FOSDEM table in Feburary.
PineVox - Virtual assistantThe PineVox is a BL606P based home assistant smart speaker. Designed to help build a good community option for voice interactions with software such as Home Assistant.
Currently a small number of developer seed units have been given out. Work is ongoing by Ralim & Gamiee to get a minimal firmware image ready to allow...
Die optimale Haussicherung zum Schutz vor Einbrechern – was ist erforderlich?
Die optimale Haussicherung Die Polizei hat alle Hände voll zu tun, denn alle drei Minuten wird in Deutschland in ein Haus oder eine Wohnung eingebrochen. Während den Hausbesitzern in früheren Zeiten nicht viele Sicherheitsmassnahmen zur Verfügung standen, so ist es heute einfacher geworden, entsprechend aufzurüsten, um den Einbrechern das Leben so schwer wie möglich zu […]
Der Beitrag Die optimale Haussicherung zum Schutz vor Einbrechern – was ist erforderlich? erschien zuerst auf RFID | Allgemeine Information | Risiken & Schutzmöglichkeiten.