shivak

6 ms·

1.
by shivak 2y ago
A DC busbar can propagate a short circuit across the rack, and DC circuit protection is harder than AC. So of course each server now needs its own current limiter, or a cheap fuse. But I’m not debating the merits of this engineering tradeof
2.
by shivak 2y ago
> > The power shelf distributes DC power up and down the rack via a bus bar. This eliminates the 70 total AC power supplies found in an equivalent legacy server rack within 32 servers, two top-of-rack switches, and one out-of-band swi
3.
by shivak 5y ago
I guess we expected a marvelous interplay of hardware and software, but all we got was fudged numbers.
4.
by shivak 5y ago
As you noted, Apple's fsync() behavior is defensible if PLP is assumed. Committing through the PLP cache isn't how these drives are meant to operate - hence the poor behavior of F_FULLSYNC. But this isn't specific to Macs and
5.
by shivak 5y ago
The first problem is rendering within the guest. If you only have one GPU, then GVT-g [1] virtualizes it with just a bit of overhead. But it's Intel only. The second problem is getting those pixels onto your screen in the host. SPICE i
6.
by shivak 5y ago
Those images are hashed, not transmitted in original format. On top of that, PSI prevents you from learning those hashes, or how many there are. So you can’t tell if the database contains the hash of, say, tank-man.jpg. I understand why thi
7.
by shivak 5y ago
> recruited mathematicians to analyze it, and published the results, as well as one in-house proof and one independent proof showing the cryptographic integrity of the system. Apple employs cryptographers, but they are not necessarily ac
8.
by shivak 6y ago
Compiling and installing large amounts of system software, a la `emerge world` or `make buildworld`, is great exposure to many system components. `make menuconfig` introduces one to various features of the Linux kernel, and yes, even a humb
9.
by shivak 8y ago
I think that’s mitigated by the physical button one has to press every time something is signed. I’m not sure if the restriction to authentication has substantially simplified the WebAuthn API. The restriction is caused by a speed optimizat
10.
by shivak 8y ago
I hoped WebAuthn would allow such general-purpose use of security devices. Unfortunately, in the spec: "To save bandwidth and processing requirements on the authenticator, the client hashes the client data and sends only the result to
11.
by shivak 9y ago
He struggled deeply with alcoholism, but the cause of his death has not been announced.
12.
by shivak 14y ago
I disagree thoroughly. I've been to both Harvard and CMU, and assisted classes at the latter. CMU SCS undergrads work much harder than Harvard undergrads, and their work is more honest. Actually, CMU students are perhaps a bit too isolated.
13.
by shivak 15y ago
Yes, but the reason why is not exactly the same. That point is lost on Krugman, who equates gold and Bitcoin on that basis.
14.
by shivak 15y ago
His description of Bitcoin is technically incorrect. As described in the original Bitcoin paper, workers are not necessarily "miners" and may be funded by transaction fees. Bitcoin isn't susceptible to hoarding because, unlike gold, it has