Dennis Lee Bieber  wrote:
> On Tue, 12 Jan 2021 10:57:04 +0000, Chris Green  declaimed the
> following:
>
>
> >
> >bone-debian-9.4-console-armhf-2018-07-08-1gb.img                  100% 850MB
 16.2MB/s   00:52
> >
> >So I get about half the 'expected' speed, also quite similar to your
> >speeds I think.
>
>         Are you taking into account the IP header size, the TCP (or UDP)
header
> size, and MTU size? The latter will tend to determine how many packets need
> to be sent (and for TCP, ACKed). Also, does your transfer method apply any
> sort of CRC or ECC logic, which will also consume some space in those
> packets?
>
>
https://networkengineering.stackexchange.com/questions/19976/trying-to-find-out
-exact-tcp-overhead-cost
>
When I copy from laptop to desktop (both quite fast machines with fast
disks) I get something quite a bit over 100MB/s on wired Gigabit
connections.  So the overhead isn't that great given that the
theoretical maximum would be 1000/8 which is 125MB/s.  So on a 300Mb/s
wireless link between the same two machines one would, sort of, expect
something a bit more than 30MB/s whereas in reality one gets about
half of that.


--
Chris Green
·

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