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Operating Systems AIX AIX networking performance, during copying files Post 303029591 by supacat on Tuesday 29th of January 2019 10:16:29 AM
Old 01-29-2019
AIX networking performance, during copying files

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)


Code:
rsync -aHAxv --numeric-ids --progress rsync://172.16.17.170:/big-archive/bigfile.dmp /u01/backup/1.dmp
receiving incremental file list
bigfile.dmp
  2,212,724,736   4%   36.28MB/s    0:23:19

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.
 

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NIGREP(1)						      General Commands Manual							 NIGREP(1)

NAME
nigrep - search for a regular expression in the NetInfo hierarchy SYNOPSIS
nigrep expression [ -t ] domain [ directory ... ] DESCRIPTION
nigrep searches through the specified domain argument for a regular expression. It searches the domain's directory hierarchy depth-first starting from the root directory. It can also start from each directory specified on the command line. The domain argument can be specified as an absolute or relative domain name. The domain argument can be specified as a network address or hostname and tag if preceded by the -t option. On output, nigrep prints the directory ID number of the directory which contains the regular expression, and the property key and values where it was found. A line is printed for each property that contains the regular expression. OPTIONS
-t Specify domain as a network address or hostname and tag. EXAMPLES
% nigrep '[Nn]et' / % nigrep '[Nn]et' -t 192.42.172.17/local % nigrep '192.[0-9]+.172' -t astra/network /machines % nigrep '/Net/server.*/Users' .. /users /mounts SEE ALSO
netinfo(5) AUTHOR
Marc Majka, Apple Computer Inc. Apple Computer, Inc. August 9, 1994 NIGREP(1)
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