RE: Gb Ethernet

By far the best way is to properly configure the machine for IPV6.

Alternatively, don't start IPV6 as you suggest. For java, you can add the "-Djava.net.preferIPv4Stack=true" system property setting on the java command in QSH.

As I don't have much control over how our customers set up their machines and IPV4 still seems to be the status quo, I ship all our java products with this property set. Many of our products never leave the box. That is, the servers and clients all live on the same box and use IP only to communicate among themselves. Still, even going to/from address "localhost" or "127.0.0.1" performance is murdered by the IPV6 configuration if it is incomplete.

-----Original Message-----
From: midrange-l-bounces@xxxxxxxxxxxx [mailto:midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of Jack Kingsley
Sent: Thursday, January 10, 2013 9:30 AM
To: Midrange Systems Technical Discussion
Subject: Re: Gb Ethernet

Dan, would you then want to make sure on the STRTCP command *NO on STRIP6 value??
Also, what if your remotely going to a DNS server, would the same apply.

On Thu, Jan 10, 2013 at 10:27 AM, Dan Kimmel <dkimmel@xxxxxxxxxxxxxxx>wrote:

Make sure you're either fully configured for IPV6 or disable it. I've
had lots of performance problems with newer machines and IBMi
versions. 6.1 and
7.1 have IPV6 enabled by default. If you aren't fully configured for
IPV6 (ie an IPV6 DNS server on the machine) the IP stack spends an
inordinate amount of time trying to find the other machine. It seems
that time is spent on EVERY packet. Most of my experience is with Java
applications which always favor IPV6 unless explicitly configured to
prefer IPV4. I don't have much experience with the FTP client and
server on IBMi, so this may not actually be a factor. But it's something to check.

-----Original Message-----
From: midrange-l-bounces@xxxxxxxxxxxx [mailto:
midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of rob@xxxxxxxxx
Sent: Thursday, January 10, 2013 7:44 AM
To: midrange-l@xxxxxxxxxxxx
Subject: Gb Ethernet

Shouldn't I be getting a lot better throughput?

Help me out with my math. I've got an Ethernet line on 1 lpar talking
to an Ethernet line on another lpar. They both say:
Current line speed . . . . . . . . : 1G
Current duplex . . . . . . . . . . : *FULL

Target system:
Resource Type
CMB03 268C
LIN04 6B26
Source system:
CMB30 181C
LIN06 181C
CMN242 181C

They are both on our same 10.17.6 subnet.

I FTP'd a sizeable file and got these results:

Size, in bytes, of save file: 13,458,505,728
Seconds to perform transmission: 2,222
Bytes/sec: 6,056,933.271
bits/byte: 8
bits/second: 48,455,466.167
Gb/bits: 0.000000001
Gb/sec: 0.048455466

iNav's Management central says lan utilization was minimal.
iNav's says percent busy of disk was minimal. (currently 2-7%) Source
system has 64 disk arms.
Target system is a guest on the source. It has 6 equal "arms".

Shouldn't I be getting a lot better throughput? After all, 0.05 is
not 1Gb.

I am not interested in any virtual ethernet backplane type solution
due to some H/A concerns.


Rob Berendt
--
IBM Certified System Administrator - IBM i 6.1 Group Dekko Dept 1600
Mail to: 2505 Dekko Drive
Garrett, IN 46738
Ship to: Dock 108
6928N 400E
Kendallville, IN 46755
http://www.dekko.com

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