Throughput on Cisco 7140-2T3

Unanswered Question
Mar 29th, 2008

I have a setup shown in the diagram. The speed and duplex are hard coded

on both the server and the Cisco 7140 and the switchport on the blade.

Servers are hard coded to 1000-full and Cisco 7140 is hard code to 100-full.

Same thing on the Catalyst 6506 blade.

When I performed iperf between linux_1 and linux_2, I get 890Mbps.

That is what I expected. However, when I performed iperf between linux_1

and Linux_3 or Linux2 and Linux_3, I only get about 30mbps throughput.

I thought that I should get much higher throughput than that, like

90Mpbs or something like that but I am maxing out at 30mbps.

Configuration on the Cisco 7140 is very simple:

interface F0/0

ip address 192.168.1.1 255.255.255.0

ip address 192.168.2.1 255.255.255.0 secondary

speed 100

duplex full

no shut

There is no other configuration on this device.

LAB>sh ver

Cisco Internetwork Operating System Software

IOS (tm) EGR Software (C7100-JO3S-M), Version 12.3(12e), RELEASE SOFTWARE (fc2)

Technical Support: http://www.cisco.com/techsupport

Copyright (c) 1986-2005 by cisco Systems, Inc.

Compiled Wed 24-Aug-05 15:44 by ssearch

Image text-base: 0x60008AF4, data-base: 0x6255C000

ROM: System Bootstrap, Version 12.0(5r)XE2, RELEASE SOFTWARE (fc1)

BOOTLDR: EGR Software (C7100-BOOT-M), Version 12.1(5a)E, EARLY DEPLOYMENT RELEASE SOFTWARE (fc1)

LAB uptime is 7 weeks, 3 days, 19 hours, 5 minutes

System returned to ROM by reload at 21:47:23 UTC Tue Feb 5 2008

System restarted at 19:45:47 UTC Tue Feb 5 2008

System image file is "slot1:c7100-jo3s-mz.123-12e.bin"

Last reload reason: Reload command

cisco 7140-2T3 (EGR) processor (revision A) with 229376K/98304K bytes of memory.

Processor board ID xxxxx

R7000 CPU at 262MHz, Implementation 39, Rev 2.1, 256KB L2, 2048KB L3 Cache

Last reset from power-on

Bridging software.

X.25 software, Version 3.0.0.

SuperLAT software (copyright 1990 by Meridian Technology Corp).

TN3270 Emulation software.

2 FastEthernet/IEEE 802.3 interface(s)

2 Serial network interface(s)

125K bytes of non-volatile configuration memory.

16384K bytes of Flash PCMCIA card at slot 1 (Sector size 128K).

8192K bytes of Flash internal SIMM (Sector size 256K).

Configuration register is 0x2102

LAB>

Furthermore, CPU on the Cisco 7140 hit 100%

utilization. at 30mbps.

Is this "normal" on the Cisco 7140 at 30mpbs throughput? Thanks.

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