kijiki

21 ms·

181.
by kijiki 9y ago
Underground power lines can get complicated in ways that are very expensive to remedy compared to aerial power lines. For example: https://www.jwz.org/blog/2002/11/engineering-pornography/
182.
by kijiki 9y ago
Process technology details go out of date quickly, so trade secrets/NDAs work well enough. Patents are more expensive and require explicit disclosure.
183.
by kijiki 9y ago
> Good luck convincing your new engineers that being inserted into your company as a cog and dealing with your business procedures for “operational efficiencies” is making the world a better place. Dead on. I'm sure the author of th
184.
by kijiki 9y ago
Many are written in shell, terrifyingly, usually running as root.
185.
by kijiki 9y ago
As you note, L1 has varied a bit, though the big change is that CSMA/CD has given way to essentially point to point L1 links with buffers and arbitration in the switches. The L2 header format has remained largely the same, with a few m
186.
by kijiki 9y ago
Given the history of CPU hot plug, it has always been generally assumed that all the CPUs in an SMP are identical (hence the S in SMP). I'm not aware of any OS that supports differing feature sets, and if one exists, it almost certain
187.
by kijiki 9y ago
Supposedly just for 1 of the 2 main variants of Spectre. Though there are many likely more timing channels that could be reasonably called Spectre variants that have not yet been fully explored...
188.
by kijiki 9y ago
https://www.amd.com/en/corporate/speculative-execution They claim no, due to microarchitectural differences in their branch predictor behavior. This is variant 2 we're talking about here.
189.
by kijiki 9y ago
The problem (requiring the cold reboot of the VM) is that they masked the PCID bit off in the CPUID, so the VM thinks it is running on a CPU that doesn't support PCID. Obviously they've stopped doing this with the new update, but
190.
by kijiki 9y ago
I don't think rowhammer style attacks are possible on TLBs, since they are SRAMs (CAMs, to be precise), not DRAMs.
191.
by kijiki 9y ago
That is probably about cooling the sensor. High-sensitivity IR sensors need to be cooled so thermal noise from the sensor itself doesn't wash out a weak IR signal. Fighter aircraft provide liquid nitrogen to captive IR missiles.
192.
by kijiki 9y ago
I am similarly disappointed that this didn't go mainstream. At Cumulus we did a follow up experiment to the one in your link, with the WD labs folks using Cumulus Linux switches. The idea was that you'd run the Ceph monitors on t
193.
by kijiki 9y ago
Azure claims they can do it, but it is still Early Access, so I've not tried it.
194.
by kijiki 9y ago
https://cappsule.github.io/ It's unmaintained now, but it is basically the same idea as WDAG. Essentially similar to firejail but the container gets its own lightweight kernel and runs in a stripped down VM, so the at
195.
by kijiki 9y ago
> I would expect something along these lines, although I'd be a little surprised if they bothered putting the NVMe bits down in silicon. You and Colin both know they bought Annapurna Labs, right? We don't have to speculate _tha
196.
by kijiki 9y ago
> YOU'RE BUILDING A HARDWARE FRONT-END TO EBS? You guys are insane! It seems more likely that they've put in a software device model of NVME as a replacement for the BlkBack software device model that the BlkFront driver talked
197.
by kijiki 9y ago
Does this deal include datacenter/HW designs? Software? Operational practices? Seems like a pretty massive technology transfer.
198.
by kijiki 9y ago
Sure, but it doesn't pull HTML or Javascript from servers, it is all packaged along with the native Electron runtime. Exploiting a Javascript vulnerability is an absurd waste of time when you could just add a backdoor or whatever to t
199.
by kijiki 9y ago
In-browser e2e encryption is vulnerable to targeted attacks on specific individuals. The service (either intentionally or by virtue of being hacked) can serve up Javascript crypto code that either uploads plaintext, or subtly backdoors the
200.
by kijiki 9y ago
Attack surface of a minimal hypervisor is way smaller than that of an entire kernel. Take a look at Clear Containers (despite the name, actually using VMs) and their qemu-lite minimal machine type.
201.
by kijiki 9y ago
Assuming OWS doesn't rate limit, all that would do is let you tell what phone #s use signal. Which is slightly sensitive info, but radically less so than "who is communicating with whom", which is what the older method could
202.
by kijiki 9y ago
This is an NPU, so for sure not in the 5k, or any other Nexus. Those are all fixed-function ASICs, in some cases (like the 3k, or the 5k's L3 module) actually Broadcom ASICs. The original 5k (which was a Nuova Systems product before c
203.
by kijiki 9y ago
They're actually fabbed by TSMC. MCST is fabless, not an IDM.
204.
by kijiki 9y ago
This was, in large part, the original rationale for BART. You'd drive a few miles from your suburban home to the nearest station, and then take the train under the bay and get off near your office downtown. But then jobs in the bay ar
205.
by kijiki 9y ago
At least on Debian, rsh is just a symlink for ssh, and rcp is just scp.
206.
by kijiki 9y ago
Your description of cut-through switching isn't quite correct. If the packet is corrupted, there is no need for the switch to intentionally break the CRC, since the only way it knew the packet was corrupted in the first place was the b
207.
by kijiki 9y ago
Interesting. The traditional problem in this space is that the source code is lost or otherwise not available. It is not clear that some encrypted source analog to encrypted verilog would be more available.
208.
by kijiki 9y ago
> The main improvement we have made with the Neo architecture is we have hard (exact cycle count) guarantees on all memory movements on and off the chip ... This is a fascinating idea, but I have a question. What happens when the next pr
209.
by kijiki 9y ago
Iris Graphics Geometry Engines weren't programmable in the modern sense. There was a fixed pipeline of Matrix units, clippers and so on that fed the fixed function Raster Engines. You could change various state that went into the var
210.
by kijiki 10y ago
Binary Translating. Basically a JIT that recompiles (for example) 32bit x86 instructions to ARM64, so that you can run old apps on new CPUs. DEC had FX!32 to run x86 Windows NT programs on Alpha Windows NT. Apple licensed Transitive's

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