gfv

7 ms·

31.
by gfv 4y ago
No, relatime applies to how often atime is updated, while lazytime controls how often all three file timestamps (atime, mtime and ctime) are written out to disk. They are orthogonal: you can have strictatime+lazytime to have accurate atime
32.
by gfv 4y ago
PSI tells you whether you have a problem or not; it's up to you to use the techniques described here to find the cause and the reason.
33.
by gfv 4y ago
Great write-up about the troubleshooting process! Regarding the exact case, there is a slightly deeper issue. XFS enqueues inode changes to the journal buffers twice: the mtime change is scheduled prior to the actual data being written, and
34.
by gfv 4y ago
It was Nortel, IIRC.
35.
by gfv 4y ago
It's not unheard of getting Cisco to give you discounts on hardware as deep as 80-85%, provided you're able to commit to buy a lot of equipment -- say, several millions $ per year. Other major networking equipment manufacturers ha
36.
by gfv 4y ago
I think the issue started a bit earlier. If you'd tracerouted from Asia to Europe at roughly 13UTC today, you could see that multiple ISPs started carrying traffic the wrong way around the world, eastward through North America, instead
37.
by gfv 5y ago
There's a pretty big difference between ICMP and UDP/TCP pings: UDP and TCP can and most likely will be load-balanced across multiple different links, as the 4-tuples change with every new packet. ICMP almost never is, so you only
38.
by gfv 5y ago
You are very welcome to tune to 4625kHz USB yourself, or use a suitable European WebSDR if you're in the US.
39.
The interesting architecture of crt.sh (2018)(lukeshu.com)
2 points by gfv 5y ago|0 comments
40.
by gfv 5y ago
Do you mean 100/8 other than the 100.64.0.0/10 RFC6598 CGNAT range?
41.
by gfv 5y ago
>in a typical setup, with Clos fabrics everywhere You choose a single spine switch to carry the multicast messages destined to the process group. The paper also explicitly notes that different process groups need not to share the sequenc
42.
by gfv 6y ago
dig has got the `-x` switch that simplifies the reverse lookups.
43.
by gfv 6y ago
No, our company's first H12 server batch with DDR4-3200 and second-generation EPYCs arrived last fall.
44.
by gfv 6y ago
Supermicro's H12 range was launched a year ago.
45.
by gfv 7y ago
The fundamental problem here is that the kernel can't time-travel into the future far enough to make sure no higher-priority processes will try to allocate more memory, as the system has to make the decision to return ENOMEM at the tim
46.
by gfv 9y ago
Nope, an EM4100-compatible card (or a key fob) is just a 64-bit ROM with radio interface. You can read its value and replay it to a reader; the latter won't be able to tell the difference between the original card and your spoofed one.
47.
by gfv 9y ago
Not all RFID cards are created the same. Most RFID cards that are some kind of "smart" (i.e. contactless bank cards, subway tickets) conform to ISO/IEC 14443 standard that mandates the use of ~13.5MHz carrier to communicate b
48.
by gfv 10y ago
"One Snowmobile can transport up to one hundred petabytes of data in a single trip, the equivalent of using about 1,250 AWS Snowball devices." -- https://aws.amazon.com/snowmobile/ You'd have to find a t
49.
by gfv 11y ago
Note that they have decomposed the GOST S-box into several non-linear 4-bit functions. While this is certainly great for hardware optimization, the cipher is still not fully understood: the authors have not determined why these particular f
50.
by gfv 12y ago
Doesn't Russian use angular quotes or double quotes where angular ones are not available?
51.
by gfv 12y ago
It's not really possible to compare LIKE to ZRANGEBYLEX. LIKE in a general case is an infix search in all text in a column, while ZRANGEBYLEX is a special case of search of all values within a given range. ZRANGEBYLEX uses a lexicograp