[clue] Link speed test

[David L. Willson]

It seems that ssh has a significant reducing effect on throughput. 

[root at server2 ~]# dd if=/dev/zero bs=4M count=256 | ssh root at server1 "dd of=/dev/null" 
256+0 records in 
256+0 records out 
1073741824 bytes (1.1 GB) copied, 26.3507 seconds, 40.7 MB/s 
2097141+22 records in 
2097152+0 records out 
1073741824 bytes (1.1 GB) copied, 26.2736 seconds, 40.9 MB/s 
Session on host1 (reciever): 

I found one that depends on nc, rather than ssh. 

[root at server1 ~]# netcat 
-bash: netcat: command not found 
[root at server1 ~]# nc 
usage: nc [-46DdhklnrStUuvzC] [-i interval] [-p source_port] 
[-s source_ip_address] [-T ToS] [-w timeout] [-X proxy_version] 
[-x proxy_address[:port]] [hostname] [port[s]] 
[root at server1 ~]# nc -l 12345 
hello 
[root at server1 ~]# nc -l 12345 > /dev/null 

Matching session on host2 (sender): 

[root at server2 ~]# echo "hello" | nc -v server1 12345 
Connection to server1 12345 port [tcp/italk] succeeded! 
[root at server2 ~]# dd if=/dev/zero bs=4M count=256 | nc -v server1 12345 
Connection to server1 12345 port [tcp/italk] succeeded! 
256+0 records in 
256+0 records out 
1073741824 bytes (1.1 GB) copied, 7.67299 seconds, 140 MB/s 

I still don't know how to use netperf, but I'll get there. 

-- 
David L. Willson 
Trainer, Engineer, Enthusiast 
RHCE Network+ A+ Linux+ LPIC-1 Ubuntu 
Mobile 720-333-LANS(5267) 

This is a good time for a r3VOLution. 
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