在 2021/1/15 下午4:27, Raffaele BELARDI 写道:
-----Original Message-----
From: bobwxc <[email protected]>
Sent: Friday, January 15, 2021 08:57
To: [email protected]
Subject: Re: [gentoo-user] network transfer speed
在 2021/1/15 下午2:56, [email protected] 写道:
On both of my systems the network card speed is showing 1000
cat /sys/class/net/enp4s0/speed 1000
but when I do rsync larage file I only see about: 20 to 22MB/s On my
home network I get about 110MB/s between PC's
Both PC's have SSD and the swith is Gigabit (I think).
How to find a the bottleneck?
1000Mbps network card's maximum theoretical speed is about 125MiB/s.
It only works in short distances.
Correct but that's the line speed that you'll never reach, when you take into
account Ethernet frame overhead, IP (and possibly TCP) header overhead and
application ( rsync, FTP, SMB, NFS) overhead you get lower figures. In my
experience 900Mbps (110MiBps) on a 1000Mbps line is more realistic for 'normal'
transfers.
Yes, you are right. So it is just *theoretical* speed :-)
I don't know where does the file he sync from.
If you sync a file from a server in other city, for a 20 to 22MB/s speed
is very normal. But if in home, that is not good.
And for ftp and rsync.
ftp is better for transferring a single large file once.
rsync is better for a long-term, incremental synchronization. The
file verification of rsync may take a lot of time for first sync.
