> Applied to "all Linux servers", 20 Mbps is not even a 
> plausible "rule of 
> thumb". I routinely see 60 Mbps on big (multi-gigabyte) LAN-to-LAN 
> transfers (ftp, scp, and samba) between pairs of Linux 
> servers (equipment 
> varies, but typically either a 1 GHz P3 or a 1.7 GHz Celeron, usually 
> cheap, "flavor-of-the-week" tulip NICs).

The 'rule of thumb' algorithm I was using is 5 megahertz = 1 megabit/sec.
Of course, once you top ~60-80mbps you start talking about interrupts and
64-bit slots and such.  Let's not really get into firewall rules.  Or what
happens to iptables when there are too many rules :)

>          a T-1 has a top speed of 1.544 Mbps, making it hard 
> for me to 
> understand how a connection over it could test the throughput 
> limit of a 10 Mbps NIC, let alone a 100 Mbps NIC.

I was testing if a 100mhz machine could handle a T1 with 3DES encryption.
It could, even with "compress=yes" set :).  Unencrypted it got around 20mbps
over the LAN.  Sorry for not being more specific.

Cheers,

P


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