Re:Splitting the Ping
by gerdesj on Monday March 01, 2021 @07:39PM
(#26310491)
"However there is a common assumption on this latency number. Is that you can divide it in half to get the time it takes to send data in one direction"
So you ssh the other end and ping in the other direction. I tend to use mtr instead.
Nowadays latency to internet services are within the sort of latencies we used to require on site. OK I do understand that not all internet connections are equal. I live in a fairly rural part of the UK - a small town of roughly 25,000 odd people. The UK is a fairly small country and fairly densely populated and quite rich, so in general: internets are fairly reasonable in comparison to the rest of the world. Not world beating but overall pretty decent.
If I ping say www.google.com (yes I know it's a funky address with random "distance") from home on my FTTC connection I see something like 15 to 20ms returns. I can ssh the office and use a 1GB link and get 8ms returns. My office PC is on the end of three 1GBs-1 hops in the building itself and it's a crappy old ex-customer hand me down (I run Arch Linux, I don't need whatever W10 requires). Both of those links are via the same ISP. My home PC test is via wifi!
I'm not going to bother going too much further with this now but if I was bothered (and I will be one day!), I would start my pinging n stuff at my internet facing router.
It wasn't that long ago that we (my company, about 10 years ago) accepted a condition of contract that required a site latency of 30ms end to end (ignoring hosts - the latency was directly measured without normal IT involvement.) 30ms!
So you ssh the other end and ping in the other direction. I tend to use mtr instead.
Nowadays latency to internet services are within the sort of latencies we used to require on site. OK I do understand that not all internet connections are equal. I live in a fairly rural part of the UK - a small town of roughly 25,000 odd people. The UK is a fairly small country and fairly densely populated and quite rich, so in general: internets are fairly reasonable in comparison to the rest of the world. Not world beating but overall pretty decent.
If I ping say www.google.com (yes I know it's a funky address with random "distance") from home on my FTTC connection I see something like 15 to 20ms returns. I can ssh the office and use a 1GB link and get 8ms returns. My office PC is on the end of three 1GBs-1 hops in the building itself and it's a crappy old ex-customer hand me down (I run Arch Linux, I don't need whatever W10 requires). Both of those links are via the same ISP. My home PC test is via wifi!
I'm not going to bother going too much further with this now but if I was bothered (and I will be one day!), I would start my pinging n stuff at my internet facing router.
It wasn't that long ago that we (my company, about 10 years ago) accepted a condition of contract that required a site latency of 30ms end to end (ignoring hosts - the latency was directly measured without normal IT involvement.) 30ms!