Hello, AIX-gurus! We have some AIX networking (?) issue, for test I created 2 LPARs (AIX 6.1) on 2 different blade IBM power servers (p702 with POWER7 on board), located in same BladeCenter H.
Networking bandwith between them is 1Gbit/s
Code:
# iperf -c 172.16.17.170
------------------------------------------------------------
Client connecting to 172.16.17.170, TCP port 5001
TCP window size: 63.6 KByte (default)
------------------------------------------------------------
[ 3] local 172.16.17.53 port 37113 connected with 172.16.17.170 port 5001
[ ID] Interval Transfer Bandwidth
[ 3] 0.0-10.0 sec 1.09 GBytes 935 Mbits/sec
But when I copy files with scp, even with fastest available cipher arcfour, it shows about 30 Mb/s (about 240 MBit/s bandwidth),
Code:
scp -o Cipher=arcfour root@172.16.17.170:/u01/exp/bigfile.dmp /u01/backup/2.dmp
The authenticity of host '172.16.17.170 (172.16.17.170)' can't be established.
RSA key fingerprint is SHA256:EuxnUV1Ru1nzf9RI0j6ui+tcC1vFGXrU0fLnVzJw0Ds.
Are you sure you want to continue connecting (yes/no)? yes
Warning: Permanently added '172.16.17.170' (RSA) to the list of known hosts.
root@172.16.17.170's password:
bigfile.dmp 3% 2009MB 28.8MB/s 28:44 ETAK
I even tried rsync-daemon, which is not using encryption, unlike regular rsync, it gives about 36 Mb/s (same bandwidth as scp)
I think it's AIX issue, because we have some x86_64 machines in this network, and when I use scp on them, with same cipher I recieve about 80 Mb/s-100Mb/s download speed.
ssh, scp et al have high CPU overhead from encryption and aren't representative of down-to-the-wire performance.
You also have your disks to consider. How fast would that happen if you wrote to /dev/null instead of ssh? Also, caching. Does it speed up when you run it twice?
Easiest utility I know to throw unencrypted content down the wire ASAP is udpcast. Of course, it's wide-open and limited to your local subnet. It can have more than one receiver with no bandwidth penalty however.
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01-30-2019
