- Talk - lists.gtalug.org

Re: [GTALUG] Question Fodder: Bcache Filesystem
by Jamon Camisso 15 May '19

15 May '19

On 5/14/19 5:12 PM, Christopher Browne via talk wrote: > Sounds like it may be the wrong moment in time to be adopting > BCache-related stuff ;-) > > Has anyone been poking at this sort of stuff? A *loooong* time ago, I used > to follow ReiserFS pretty closely, back when that project was a technical > matter, as opposed to being (rather properly!) overshadowed by a murder > investigation :-( We use it for every customer's Openstack cloud for almost every openstack component. Nova, Ceph, Swift, Keystone, and MySQL are the major services, and each has a bcache underlay along with a hardware RAID controller. It has proven to be quite a reliable (and fast) setup, and even in the event of a power cut we haven't lost any data. For nova especially where users are interacting with VMs, it means a customer can have large amounts of storage allocated for a VM, and writes feel as though the whole system is running on an SSD. Likewise for Keystone & MySQL, where in busy clouds with clustered MySQL, tokens can take a long time to generate, fetch, and authenticate without the SSD backing. All around quite useful, just don't run it on the leading edge of GCC, Kernel, and OS releases!

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Question Fodder - RISC-V
by Christopher Browne 14 May '19

14 May '19

I'm bringing in a sample of the Sipeed Tang Primer chip, which is a RiscV on a wee board. Picture attached. Poke a MicroUSB cable into the port at the end, and see some Blinkenlightzen. I have had only very limited success with a "Hello World" (see the following web site; it's got good material, possibly dated, but nevertheless specific... https://justanotherelectronicsblog.com/?p=470) It appears the FPGA may be programmed via the built-in USB port; I downloaded latest edition of Tang Dynasty FPGA programmer app, and pulled the code for the RISC-V; it appears to have been optimizing routing for a couple of weeks now without reaching completion, which makes me suspicious that something may not be working ;-) http://tang.lichee.pro/get_started/fpga_download.html I have built some apps using a suitable GCC target compiler, but again, some lack of success deploying code. That needs an STLink32 "JTAG" programmer, which I have recently had hooked up, but with a lack of success at getting Linux box to talk to it. There is some confusion as to whether I should be seeing /dev/ttyUSB1 or discovering some filesystem-like device (perhaps MTP) that I'd talk to. Supposedly, I should be able to upload a whole image consisting of Linux, init.d, and some set of tools that can boot and run and be talked to via a TTY talking to /dev/ttyUSB1 (or perhaps something else). At any rate, a wee box with a Sipeed Tang and a couple of sets of long pins to help work with it will be coming in tonight, and if anyone is keen on playing with it, I'm happy for it to have it head to someone interested.

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[GTALUG-Announce] Meeting Tonight
by hi＠gtalug.org 14 May '19

14 May '19

<https://gtalug.org/meeting/2019-05/> # Round Table Q&A Session ==== A Round Table Q&A Session is where we take questions from the audience, and the audience discusses and attempts to answer those questions from their own knowledge. It's a great way to meet fellow members of our community and discover the skill sets we each bring to the table. There will be no video recording during the session. ==== ## Location George Vari Engineering and Computing Centre 245 Church Street, Room 203 Ryerson University <https://goo.gl/maps/16oJ2> <https://www.openstreetmap.org/way/23447525> ## Schedule * 6:00 pm - Please discuss on the general mailing list (i.e. <talk(a)gtalug.org>) where you want to go for dinner. * 7:30 pm - Meeting and presentation. * 9:00 pm - After each meeting, a group of GTALUGers move to The Imperial Pub (54 Dundas St East) for refreshments and more socialising. # Code of Conduct We want a productive happy community that can welcome new ideas, improve every process every year, and foster collaboration between individuals with differing needs, interests and skills. We gain strength from diversity, and actively seek participation from those who enhance it. This code of conduct exists to ensure that diverse groups collaborate to mutual advantage and enjoyment. We will challenge prejudice that could jeopardise the participation of any person in the community. The Code of Conduct governs how we behave in public or in private whenever the Linux community will be judged by our actions. We expect it to be honoured by everyone who represents the community officially or informally, claims affiliation or participates directly. It applies to activities online or offline. We invite anybody to participate. Our community is open. Please read more about the GTALUG Code of Conduct here: <https://gtalug.org/about/code-of-conduct/>. If you have any questions, comments, or concerns about the GTALUG Code of Conduct please contact the GTALUG Board @ <board(a)gtalug.org>. --- GTALUG Announce mailing list announce(a)gtalug.org https://gtalug.org/mailman/listinfo/announce

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Jobs at Epson Canada
by William Park 12 May '19

12 May '19

Hi all, Three (3) jobs recently opened up at my company, Epson Canada. And, they are asking help from employees in search for candidates. > 1. Machine Learning Research Scientist (Robotics Control) for EDGE This is R&D robotic 2nd floor. The focus is more on algorithm, but Linux is part of discussion during lunch. > 2. Firmware/Embedded Developer for RTSC > 3. Software Technical Support Representative for RTSC These two are in my group 1st floor, and definitely Linux related. If you're interested or know of someone who is interested, then let me know and I can send you more "official" details. Eventually, you'll be applying directly. -- William Park <opengeometry(a)yahoo.ca>

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surprisingly okay laser printer on special at Canada Computers: Brother DCP-L2550DW
by Stewart C. Russell 07 May '19

07 May '19

It's rather sad that Linux users are back to scratching around to find compatible printers. For a few years, almost everything just worked. Now we're deeply into the Gillette model of sales: make money on consumables, but sell the main hardware cheap. It's not helped that the Apple-owned CUPS printing system — though completely open — is absurdly complex and makes diagnosing print problems very hard. Our old Brother network laser printer having become mysteriously slow (first page times in the 10s of minutes) and producing horrible output, it was time for a new one. A little digging turned up this: https://www.canadacomputers.com/product_info.php?cPath=34_1170_454&item_id=… for $140. It's not marked as a special, but other vendors sell it for around $240. It's a full PCL/PostScript (well, BR-Script) network printer with a simple ADF scanner on top. Since it's an IPP printer, it can usually be auto-discovered on the network. With the right generic driver (cups-ipp-utils on Debian) it'll print properly on any architecture of Linux: my Raspberry Pis are perfectly happy with it. It's IPv6 aware too, if that matters to you. The product page gives you access to "full featured" Linux drivers, including one for the scanner: https://support.brother.com/g/b/producttop.aspx?c=ca&lang=en&prod=dcpl2550d… Unfortunately, these drivers are x86 only (and one's not even x86_64). The scanner driver is *utterly* dismal. While I was quite pleased it could scan directly (via a brscan system service) over wireless to my computer, all it could do is dump the first page as a very low resolution Legal-sized B&W scan to a PNM file in ~/brscan. Worse still, the file and folder were owned by root. Everything but the first page in the ADF is ignored (but ejected from the ADF, dammit). Thankfully, the processes are managed through shell scripts stored in /opt. These scripts are appalling badly written. There's a script for each of the scanner's Scan to Image/Document/Email/OCR functions, but most of them don't work as shipped. The OCR one has a whole section of might-have-worked-once code commented out and doesn't seem to generate any output at all. Despite their flimsy feel, Brother printers are fairly robust. Nait Singh* warns that some of the newer (cheaper) Brother printers use different control engines even in the same printer model, and that very new Brother printers have 'chipped' printer cartridges that need a little work to circumvent. Nait's been refurbishing, refilling and selling printers for years and is quite careful to suggest the lowest TCO printer to buyers. He still recommends Brother laser printers over anything else. HP he describes as dead to him: their support, quality and compatibility has plummeted. Yes, this printer gets a "surprisingly okay" rating from me, as printers these days mostly seem to have difficulty doing what they should. cheers, Stewart *: Nait owns Cartridge Ink Plus at Kennedy & Progress (1-7 Progress Ave, Scarborough, ON, M1P 5A3 — https://www.cartridgeinkplus.com) The store might appear a little eccentric, but Nait just wants you to have a reliable printer at a good price. He didn't seem remotely bothered that I'd buy a printer for less from Canada Computers rather than spend more at his place.

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Windows 10 will soon ship with a full, open source, GPLed Linux kernel | Ars Technica
by James Knott 06 May '19

06 May '19

To follow with Steve Ballmer's comment about Linux, Windows now has cancer. ;-) https://arstechnica.com/gadgets/2019/05/windows-10-will-soon-ship-with-a-fu…

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Debian BSP presentation video
by Alex Volkov 01 May '19

01 May '19

Hey Everyone, anarcat's presentation on Debian Packaging 101 at the Toronto BSP is now available on youtube -- https://youtu.be/O83rIRRJysA Alex.

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Free printer and scanner
by William Park 28 Apr '19

28 Apr '19

Hi all, I have 1. Epson WorkForce WF-2650 -- all-in-one printer 2. Epson WorkForce DS-560 -- color document scanner collecting dust in my basement. They were demo units used by Marketing department, and I won them in raffles. Anyone want them? -- William Park <opengeometry(a)yahoo.ca>

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of routers and access points
by David Mason 27 Apr '19

27 Apr '19

I had a setup where my modem was connected to my gateway Linux box which did routing, DHCP, DNS, etc. and was also connected to a switch which was connected to a WiFi router being used as an access point. This is too brittle for my tastes, as other members of my family can’t resolve problems with it. Something went wrong so I have temporarily reconfigured it so the WiFi router is connected directly to the modem, but this doesn’t let the WiFi clients connect to the Linux boxes or other hard-wired machines or let them connect to the internet. (I could connect the other devices to the router, but for WiFi propagation reasons, the WiFi router is far away from all the other devices, so this is not ideal.) So I was thinking of getting a https://www.canadacomputers.com/product_info.php?cPath=27_1046_363&item_id=… router and connecting to that the Linux box (which would still do DHCP (possibly) and DNS, the router configured back as an access point (or a POE access point such as https://www.canadacomputers.com/product_info.php?cPath=27_1056_356&item_id=…, as well as the other wired devices. Thoughts? Thanks. ../Dave

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[GTALUG-Announce] Round Table Q&A Session
by hi＠gtalug.org 23 Apr '19

23 Apr '19

<https://gtalug.org/meeting/2019-05/> # Round Table Q&A Session ==== A Round Table Q&A Session is where we take questions from the audience, and the audience discusses and attempts to answer those questions from their own knowledge. It's a great way to meet fellow members of our community and discover the skill sets we each bring to the table. There will be no video recording during the session. ==== ## Location George Vari Engineering and Computing Centre 245 Church Street, Room 203 Ryerson University <https://goo.gl/maps/16oJ2> <https://www.openstreetmap.org/way/23447525> ## Schedule * 6:00 pm - Please discuss on the general mailing list (i.e. <talk(a)gtalug.org>) where you want to go for dinner. * 7:30 pm - Meeting and presentation. * 9:00 pm - After each meeting, a group of GTALUGers move to The Imperial Pub (54 Dundas St East) for refreshments and more socialising. # Code of Conduct We want a productive happy community that can welcome new ideas, improve every process every year, and foster collaboration between individuals with differing needs, interests and skills. We gain strength from diversity, and actively seek participation from those who enhance it. This code of conduct exists to ensure that diverse groups collaborate to mutual advantage and enjoyment. We will challenge prejudice that could jeopardise the participation of any person in the community. The Code of Conduct governs how we behave in public or in private whenever the Linux community will be judged by our actions. We expect it to be honoured by everyone who represents the community officially or informally, claims affiliation or participates directly. It applies to activities online or offline. We invite anybody to participate. Our community is open. Please read more about the GTALUG Code of Conduct here: <https://gtalug.org/about/code-of-conduct/>. If you have any questions, comments, or concerns about the GTALUG Code of Conduct please contact the GTALUG Board @ <board(a)gtalug.org>. --- GTALUG Announce mailing list announce(a)gtalug.org https://gtalug.org/mailman/listinfo/announce

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