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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 a week ago
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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 two weeks ago
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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 a month and a half ago
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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 2 months ago
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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 2 months ago
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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 2 months ago
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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 10 months ago
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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 ago
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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 a year and a half ago
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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
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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
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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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Intel Releases Sandy Bridge-based Xeon E5 Series

Ben Hutchings Re:Where's the 10GbE? (96 comments)

I think you're mistaken about PCIe link speeds, and you're also failing to account for the transaction layer protocol (TLP) overhead which can be quite substantial. PCIe 2.0 link speed is 5 GT/s but that's with 8b10 encoding; the data rate is only 4 Gb/s. PCIe 3.0 doubles the data rate to 8 Gb/s. Two 10G ports require 20 Gb/s plus some overhead, hence 8 lanes on PCIe 2.0 or potentially 4 lanes on PCIe 3.0.

more than 2 years ago
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AWS Load Balancer Sends 2 Million Netflix API Reqs To Wrong Customer

Ben Hutchings Re:TTL value (58 comments)

If browsers don't impose such a minimum, devices with embedded web servers (think printers and home routers) become vulnerable to Cross-Site Request Forgery. They can potentially defend against this by checking the Host header on requests, but since these devices are only manageable through the web there's no good way to establish what the correct value is.

more than 2 years ago
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Is ARM Ever Coming To the Desktop?

Ben Hutchings Re:cost and integration, not just power (332 comments)

With Intel you have to buy a CPU, buy a north/southbridge. If you want custom interfaces beyond that, that's more chips too.

Not so. Intel has SoCs now. Apparently they're quite popular for use in IVI applications.

about 3 years ago
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Windows 8 Desktop 'Just Another App'?

Ben Hutchings Re:sort of like? (375 comments)

Explorer isn't the window manager, although it does have some integration to make minimised windows appear within the task bar. The window manager largely runs as a library within the application (USER32.DLL). Windows 2000 added the feature that lets you force minimisation or kill the window's owner if it doesn't process window management messages quickly. (I don't know what component or process handles this.) More recently DWM.EXE was introduced to handle some window management and particularly compositing.

more than 3 years ago
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Linus Thinks Virtualization Is 'Evil'

Ben Hutchings Re:Some might argue (330 comments)

Try migrating a running system with dd. Many VM systems can do live migration, with a fraction of a second of down-time.

more than 3 years ago
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UK Government Wants to Spring Ahead Two Hours

Ben Hutchings Re:BAU (554 comments)

In Israel, the parliament only ever specifies the period of DST for one year at a time. I hear that Israeli Windows users don't even bother with automatic DST adjustment.

more than 3 years ago

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