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User Plea Means EISA Support Not Removed From Linux

Ben Hutchings Re:Crusty Hardware (188 comments)

Debian accidentally dropped support for 486 by turning on kernel stack smashing protection, which uses RDTSC. This was done before Debian 6.0 (squeeze) but we only recently received a report that it failed to boot on a 486.

3 days ago

Big Names Dominate Open Source Funding

Ben Hutchings Re:Open Source Funding (32 comments)

A mask set is not likely to be the "preferred form for modification"; for digital logic that would typically be VHDL or Verilog files.

about two weeks ago

Big Names Dominate Open Source Funding

Ben Hutchings Re:Open Source Funding (32 comments)

But they'd STILL need a factory.

No they wouldn't - the vast majority of silicon vendors are fabless, while some silicon developers don't even sell complete chips at all, only 'IP blocks'. It is absolutely possible to have free/open source chip designs.

I think the big stumbling block currently would be the very limited FOSS tools for synthesis and layout.

about two weeks ago

How a Wildfire Helped Spread the Hashtag

Ben Hutchings Re: Metadata (36 comments)

SMS allows 7-bit, 8-bit and variable-length (UTF-16) encodings, for 160/140/80 code units per message. The 140 character limit leaves some room to add a username prefix when users receive tweets by SMS in a 7-bit encoding.

Whatever the restrictions of SMS or the original Twitter service, tweets may now use any Unicode character (for some version of Unicode). Whenever they forward tweets by SMS, if they have to use an 8-bit encoding or UTF-16 they may need to split.

about a month ago

Ask Slashdot: Dealing With Electronics-Induced Inattentiveness?

Ben Hutchings Re:Focus (312 comments)

... quit reading Slashdot comments, ...

about 2 months ago

Help ESR Stamp Out CVS and SVN In Our Lifetime

Ben Hutchings Re:I am not going to convert (245 comments)

the trouble with DVCSs is there is no repository to backup.

There are many repositories you can backup. It's a matter of policy for each project to choose which of these is the authoritative version.

Everyone has their copies and a vape in one can (and will) be propagated to the others.

It sounds like you are talking about non-fast-forward pushes. These can be disallowed, and I think that's the default but I could be wrong. It's also not necessary to allow all developers to push to the authoritative repository (which you can't do with a centralised VCS).

Its not like a centralized system where you can have proper backups.

No, it's much better.

about 3 months ago

Samsung's Wi-Fi Upgrades Promise Speeds Up to 4.6Gbps

Ben Hutchings Re:Always divide by 2, if not significantly more. (92 comments)

Also, wifi is half-duplex (no separate uplink and downlink frequencies) so any traffic in the other direction (like ACKs) reduces available bandwidth.

about 3 months ago

NVIDIA Presents Plans To Support Mir and Wayland On Linux

Ben Hutchings Re:Seems incorrect (80 comments)

You need at least:

1. Kernel driver for hardware init, power management, mode setting, GPU buffer management and command submission

2. Userland library for GPU buffer management and command submission

3. OpenGL implementation

In the open source graphics stack, the kernel driver exposes KMS and DRM interfaces and potentially others. Parts 2 and 3 are part of libdrm and Mesa respectively. The display server can (I think) be built on top of KMS, libdrm and OpenGL and be independent of the hardware. However it will need an extension to OpenGL called EGL which will be specific to each display server protocol.

Currently X doesn't usually work that way for historical reasons - it used 2D acceleration first and still supports hardware that has only 2D acceleration. So it has hardware-specific drivers for each family of GPUs. However there is the 'Glamor' library that supports 2D acceleration genericallly on top of OpenGL, and I would expect to see a gradual move to that, not least because it's the only option for 2D acceleration in XWayland.

Getting back to Nvidia, their problem currently is that they don't implement the same interfaces as the open source stack and therefore don't work with the new display servers that depend on those interfaces. Implementing KMS gets them a long way there. However it sounds like they still need to reimplement the EGL, not because it's hardware-specific but because their OpenGL implementation is entirely independent of Mesa.

about 3 months ago

Combating Recent, Ugly Incidents of Misogyny In Gamer Culture

Ben Hutchings Re:One bad apple spoils the barrel (1134 comments)

1. The allegations against Quinn are insinuations with no evidence behind them.
2. Sarkeesian has been loudly contradicted and claimed to be a con-woman by people that can't take criticism and are annoyed by the success of her Kickstarter.
3. This is being called "misogyny" in gaming because it is directed specifically at women.
4. The Social Justice Warriors have all supported these women because they oppose misogyny.
5. It's so cheap and easy to brand gamers basement dwelling vrigin men-children than it is to look at the facts. This is stereotyping, but it is nothing like the harrassment, online bullying, doxxing or death threats made by some gamers against feminist critics.

Fixed that for you.

about 5 months ago

Facebook Seeks Devs To Make Linux Network Stack As Good As FreeBSD's

Ben Hutchings Re:This does pose the question: (195 comments)

ASICs generally aren't flexible enough that you could simply emulate another controller in firmware, while FPGAs suck too much power to use on commodity network adapters. Writing a new driver (or bringing an existing neglected driver up to scratch) is going to be quicker than trying to make hardware that's compatible enough to work with a driver written for another vendor's controller.

(Besides which, as that other driver is probably maintained by your competitor, do you really think they're going to make an effort to ensure that their later updates are compatible with your clone controller? You'll still have to maintain your own fork.)

I have often wondered why there isn't a vendor-neutral register-level standard for Ethernet controllers, along the lines of AHCI and xHCI. There is the virtio networking standard, but as it's designed for VMs I assume it does not cover Ethernet link management. I seem to remember that VMware tried to promote a common interface for SR-IOV virtual functions at one time, but that didn't get very far. Again that would not have included link management.

about 5 months ago

Facebook Seeks Devs To Make Linux Network Stack As Good As FreeBSD's

Ben Hutchings Re:This does pose the question: (195 comments)

Right. They want FreeBSD drivers, they can put that on the requirements list for network and storage controller vendors. But that does leave the issue of where the vendors are going to find good FreeBSD hackers to write these drivers.

about 6 months ago

Digia Spinning Off Qt Division Into New Company

Ben Hutchings Re:Can't beat the Micro$oft Machine (59 comments)

Another example I noticed recently: LeCroy PETracer.

Qt by default uses native widgets wherever possible

I believe it imitates the look of native widgets but doesn't actually use them. This should allow for consistent behaviour on all platforms (unlike, say, WxWidgets).

about 6 months ago

Under the Hood of SteamOS

Ben Hutchings Meanwhile, in reality... (201 comments)

It's a stock Debian kernel with some minor packaging changes and support for a new game controller. All those realtime patches? Not actually used by default. The full list of exciting changes:

  • Make the binnmu regexp also reconize our build suffixes
  • New XBox controller driver
  • Disable Intel P-State driver as it causes issues with sound being choppy during BigPicture trailer video playback.
  • Hard-code parallel build for now since our OBS infrastructure doesn't know how to set these options yet.
  • Add postinst step to touch /var/run/reboot-required

about a year ago

Subversion 1.8 Released But Will You Still Use Git?

Ben Hutchings Re:But can SVN merge a branch yet? (378 comments)

Repeated merges have worked well for a while now (maybe since 1.6?). It's not quite as good at merging as git is, but it works well enough. But I have to agree with the general sentiment against merging from release to devel branches. Merging should be considered an expert-only operation (not expert in version control, but in the code base). Cherry-picking/backporting fixes from devel to release is safer because then you know exactly what you're changing.

about a year and a half ago

Firefox Will Soon Block Third-Party Cookies

Ben Hutchings Re:Online Advertising Response (369 comments)

Whenever a web site has a form, some other site can set up another (hidden) form pointing to the same URL and with any values they like. Someone who visits both sites can unintentionally submit that form (together with their cookies from the first site, so it's properly authenticated). This is 'Cross Site Request Forgery' and the usual way to avoid is to check the Referer header.

about 2 years ago

Making ZFS and DTrace Work On Ubuntu Linux

Ben Hutchings Re:ZFS on Linux (137 comments)

The current Debian stable release (6.0, squeeze) has kFreeBSD ports for i386 and amd64.

more than 2 years ago

Heartland Security Breach Class Action: Victims $1925, Lawyers $600,000

Ben Hutchings Who leaked my card details? (163 comments)

I personally haven't experienced abuse of my card details - so far as I know. But if I did, how could I tell who was responsible - especially when there are vast leaks like this? It seems like it would be more fair to have an industry-wide fund to compensate victims, which the leaking companies would pay into proportionately to the number of valid details leaked.

more than 2 years ago

Demoscene: 64k Intros At Revision Demoparty

Ben Hutchings Re:Damn you kids, get off my lawn. (207 comments)

There's not 64k of assembly pumping bytes into a framebuffer and twiddling the PC speaker port to synthesize digital audio.

Of course. But all the creative work is squeezed into 64K.

One thing I couldn't find in there (and I've been out of the scene for a LONG time, so I don't know how this works on new-fangled fancy computers...) -- do these write directly to the video hardware? Or do they use OS services like DirectX11, etc?

They use DirectX, because that is the only way to support a reasonable range of hardware. (Also, you can't hit the hardware without installing a new driver or exploiting a kernel bug. Neither of which is very friendly.)

But are people still getting down and counting clock cycles?

Cycle counts aren't even documented today. Now it's all about avoiding cache misses and cache invalidation.

more than 2 years ago


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