4 ms·
ok this article had me intrigued (and the fix presented to speedup rsync for large files is good) but then, this gem: "The thing is, modern networks aren’t lik
by chetanahuja 13y ago
ok this article had me intrigued (and the fix presented to speedup rsync for large files is good) but then, this gem:
"The thing is, modern networks aren’t like that at all, they’re high bandwidth and low latency"
No they're not. Unless you mean two machines sitting side by side in a data center or perhaps within the same metro area connected via wired connections.
Two machines sitting on either coast of US with the best wired connectivity at either end are at least 70-80 ms away from each other. That's not "low" latency.
Connected via anything less than a perfect connection on either end, now you're looking at 100+ ms latency.
One of the ends is on non-wired internet connection (LTE, Wimax etc.) and now you're looking at 150+ ms and with high standard deviation (in ping latencies).
Slow pace of latency improvements is as much a fact of life as the slow pace of battery life improvements. Perhaps because both are constrained by hard physical limits of nature.
- kbenson 13y agoAlthough in some cases being able to assume low latency and use the appropriate changes is appropriate. Rsync is used quite a bit to sync data on servers within the same datacenter, or even cabinet/switch.
- deleted 13y ago[deleted]
- bigiain 13y agoAnd for some of us, this is a typical experience: 25 packets transmitted, 25 packets received, 0.0% packet loss round-trip min/avg/max/stddev = 263.361/321.076/375.393/29.289 ms (That's from Sydney Australia to a DigitalOcean Droplet in nyc1)
- mcpherrinm 13y agoIn the article, the author mentions sending "1.2 terabytes in a few hours" with 10ms latency. This sounds like a gigabit network with a few router hops in the middle. Maybe 100mbit if "a few hours" is interpreted longer than I would. So we're talking about connecting two machines, possibly in different buildings, but likely within a thousand kilometers. It's honestly the use case I have the most often, and certainly one useful to have tools supporting the use case. This person seems to be worried about off-site backups, so I'm thinking "enterprise", not "cross-country home user".