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Full Discussion: Network performance changes
Operating Systems AIX Network performance changes Post 302879259 by techy1 on Wednesday 11th of December 2013 01:15:18 PM
Old 12-11-2013
Network performance changes

Hi,

Recently I've been doing some performance changes for inter-lpar configs and completing some testing. So far test have been successful and promising but only completed in a dev environment.

Here is what I've done
created a separated vlan for inter-lpar communications separate from the VIO.
adjusted the MTU to 65280, and enabled Large Send.

transferred have increased by aprox 70% in some test. lowest was a 50% increase from the original configurations on other servers. I did see a improvement in terms of CPU as well compared to using default settings.

so my main question is this....
overall it was great. the problem which i was expecting was sftp/scp.
using nmon i did confirm they were transferring on the correct ports but transfer times were extremely slow.

I was using a 6GB file for test, on ftp best avg time was 14 seconds (all test were completed by a average of 10 test) when transferring 6 6GB files at the same time, avg time was 23 seconds.

Using sftp/scp transfer times were 2:30 min. 6 files approx 5 min.

so my next step was to try changing the algorithm on these processes which i personally was trying to avoid. I didn't run 6 concerent test with this one but the avg time was around 1:30 min.

Here was what i used for sftp:

Code:
sftp -B 260000 -o Ciphers=arcfour -R 512

here is what i used for scp:

Code:
scp -c arcfour

from ifconfig on this interface:

Code:
tcp_sendspace 262144 tcp_recvspace 262144

when using MTU=65280 and largesend what would be the best thing to adjust in terms of network tuning.

As I said this is just dev testing and I know real cases will be different but I'm just trying to see what improvements I can make since some people have been complaining about slow transfers between systems and this was the best i can think of at the moment.
 

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GONG(1) 						      General Commands Manual							   GONG(1)

NAME
gong - evaluate process performance SYNOPSIS
gong [-f] [-a] process-id DESCRIPTION
Gong is used to evaluate the performance of a process that is in execution. The process-id is the process number of the process whose performance is to be evaluated. The evaluation is performed by a set of three ``panelist'' routines, each of which analyzes one aspect (time, space, and tonality) of the performance of the process. If any of these routines is not amused by the performance, the process being analyzed is sent the gong(2) signal. In addition, the process-id of the eval- uated process is written on the standard gong, for possible future corrective action. (It is suggested that the standard gong be an audi- ble alarm for proper effect.) It is expected that after being gong(2)ed, the process will promptly commit suicide. The -f keyletter argument indicates that gong is to invoke flog(1) with the unmerciful argument if the process does not respond to gong(2)ing. In the absence of this argument, the process is continuously gong(2)ed, which may lead to the process becoming a deaf zombie. The -a keyletter argument indicates that if all three of the panelist routines gong(2) a process, the process should be unmercifully flog(1)ged whether or not the -f keyletter is supplied. FILES
/dev/ding.dong is the standard gong. SEE ALSO
On the Applicability of Gonging to the Performance and Merit Review Process, Journal of Irreproducible Results, vol. 263, issue 19, pp. 253-307. BUGS
If the named process does not exist, it is possible that gong will attempt an evaluation of itself, which may lead to a condition known as compounded double ringing (see echo(1)). Therefore, it is recommended that gong be used with extreme care. GONG(1)
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