drv

4 ms·

1.
by drv 2y ago
I/O scheduler was probably a bad example, since you might not need/want one for fast NVMe devices anyway, but yes, they help ensure limited resources (storage device bandwidth or IOPS) get shared fairly between multiple users&#x2F
2.
by drv 2y ago
It's cool to see more systems code written in Rust! I also previously worked on SPDK, so it was neat to see it being chosen as a point of comparison. However, I was waiting for the touted memory safety to be mentioned beyond the introd
3.
by drv 9y ago
The assembly version is using the packed version of the FMA instruction (that's what the "P" in the mnemonic stands for), but as far as I can tell, it's only using one of the packed values, whereas the instruction can ca
4.
by drv 10y ago
nextAfter is probably also including the denormals (an additional 2^23 values near 0).
5.
by drv 10y ago
One possible reason is that storing a bool separately from the index makes it difficult to update the producer or consumer index atomically. With the implementations that store the full producer and consumer states as a single word each, o
6.
by drv 10y ago
It's presumably not standard Host Memory Buffer, since the spec says "The controller shall function properly without host memory resources."
7.
by drv 10y ago
2001, not 2011. Time flies. :)
8.
by drv 10y ago
(Assuming you mean MailChimp) I don't know anything about how MailChimp operates, but a quick search turns up this blog post about how to set up SPF records [1]. From there, you can get a list of which IPs MailChimp authorizes as a sen
9.
How (and why) FreeDOS keeps DOS alive(computerworld.com.au)
2 points by drv 10y ago|0 comments
10.
Brillo Common Kernel(android.googlesource.com)
15 points by drv 10y ago|1 comments
11.
by drv 10y ago
It has a C API, but everything under the hood is C++. The source is actually public now: https://github.com/Microsoft/Windows-Driver-Frameworks
12.
by drv 10y ago
Microsoft has been shipping static analysis tools with the Windows DDK for a long time (originally PREfast[1], now Static Driver Verifier[2]). I believe the static analysis is even integrated with Visual Studio now. [1]: http://r
13.
by drv 11y ago
In practice, this is probably correct (Microsoft cares a lot about backward compatibility, and many programs depend on MSVCRT.DLL). However, the official word from Microsoft is that MSVCRT.DLL is only intended for operating system component
14.
by drv 11y ago
Anyone running FFmpeg[1] on untrusted input without sandboxing of some kind is being extremely negligent. It's around a million lines of C that does tricky file format parsing and decoding. There will definitely be bugs in any given v
15.
by drv 11y ago
Ah, I see. The I/OAT DMA copy offload is essentially equivalent to an asynchronous memcpy(), so anything addressable on the memory bus could be a source or destination (with some caveats about alignment requirements and pinned pages if
16.
by drv 11y ago
The SPDK libraries are mostly storage-specific components (the I/OAT DMA engine can be used for generic copy offload, but it is particularly useful for copying between network and storage buffers). SPDK itself does not provide any net
17.
by drv 11y ago
The NVMe driver will only work for a fairly narrow set of uses in which the whole NVMe device(s) can be dedicated to a single application (this is because the user-space application takes control of the NVMe device directly, so the kernel d
18.
by drv 11y ago
I don't know anything about Omni-Path, sorry. However, based on the publicly available information, it does look like a very interesting combination. One major advantage of SPDK over the traditional kernel-provided storage stack is l
19.
by drv 11y ago
I am an engineer working at Intel on SPDK, and I can answer any technical questions you might have. Currently SPDK consists of a usermode NVMe (PCIe-attached SSD) driver. We will soon be releasing a usermode driver for the Intel I/OAT
20.
by drv 11y ago
It's certainly true that the polled-mode driver model doesn't interact well when the application needs to use other APIs that don't provide a polled mode. However, SPDK can be used in conjunction with a polled user-mode netw
21.
by drv 11y ago
This looks like an ideal case for something like ldexp(), but I couldn't find an equivalent function in Java at first glance. A lookup table seems like a bit of a shame for something that should be inherently fast in binary floating po
22.
by drv 11y ago
The bufferbloat-related changes made in CeroWRT ( http://www.bufferbloat.net/projects/cerowrt ) have been merged into the Linux kernel and the OpenWrt project.
23.
by drv 11y ago
That's odd; the certificate I'm seeing for news.ycombinator.com has a SHA-256 signature, and the Qualsys test agrees.
24.
by drv 11y ago
The 55 MPH limit in the US wasn't even instituted for safety reasons; it was a reaction to the oil crisis. Any safety impact was probably due more to the improvements in car safety that you mention.
25.
8088 MPH: We Break All Your Emulators(trixter.oldskool.org)
319 points by drv 11y ago|99 comments
26.
by drv 12y ago
Arguably car aesthetics peaked in the past too - perhaps in the 1960s (e.g. Jaguar E-type). Certainly it is somewhat a matter of taste, but modern car designers also have restrictions that older ones didn't, such as pedestrian safety
27.
by drv 12y ago
This open office obsession is essentially panopticon programming.
28.
by drv 12y ago
There's even an example of this code page in the article - it mentions the name "Markku J{rvinen", which is presumably intended to be "Markku Järvinen". This is probably accidental, as the page is served with chars
29.
by drv 12y ago
The article goes into more detail on the "why", but the "art" is not really that complicated or lost: sort structure elements by size/alignment, biggest first.
30.
by drv 12y ago
Does that mean it will be Windows RT API-wise or something else?

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