Bug 63071 - Xircom CBEM56G Excessively Slow
Xircom CBEM56G Excessively Slow
Product: Red Hat Linux
Classification: Retired
Component: kernel-pcmcia-cs (Show other bugs)
i386 Linux
medium Severity medium
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Assigned To: Dave Jones
Brian Brock
Depends On:
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Reported: 2002-04-09 15:51 EDT by David Crim
Modified: 2015-01-04 17:01 EST (History)
1 user (show)

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Fixed In Version:
Doc Type: Bug Fix
Doc Text:
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Clone Of:
Last Closed: 2004-11-25 03:16:44 EST
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oVirt Team: ---
RHEL 7.3 requirements from Atomic Host:
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Description David Crim 2002-04-09 15:51:12 EDT
From Bugzilla Helper:
User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:0.9.8) Gecko/20020212

Description of problem:
This is a simular problem to those reported for RedHat 7.0 bug 21802 and 7.1 bug
37454, but it hasn't been registered for RedHat 7.2

I have been using a Xircom CBEM56G on a Dell Latitude CPx H500 under RedHat 7.2.
This laptop used to work great under RedHat 6.2. It has always had problems with
newer releases unless I rebuilt the kernel with an old PCMCIA driver set from
the 6.2 days.

The default installtion sets up networking, but I only get between 10 Mbits/sec
and 20 Mbits/sec throughput.

Version-Release number of selected component (if applicable):

How reproducible:

Steps to Reproduce:
1. Install RedHat 7.2 and updates
2. Use networking (netperf -H another_machine_runing_netserver)

Actual Results:  Networking is very slow. Netperf reports less than 20 Mbits/sec.

Expected Results:  This is a 100 Mbit/sec and Modem combo card. I expect
something close to 100 Mbit/sec.

Additional info:

Recently I am having some success with a 2.4.9-21 kernel. Using netperf
perfomance went form < 20 Mbits/sec to > 75 Mbits/sec between machines attatched
to the same switch, a Netgear FS108.

I did the following:

1) Moved /etc/rc.d/rc5.d/S45pcmcia to /etc/rc.d/rc5.d/S09pcmcia. Do the same for
run levels 2, 3, and 4 if you use them.

2) Add a line to /etc/modules.conf:

alias eth0 xircom_tulip_cb

3) Remove xircom_tulip_cb from /etc/hotplug/blacklist.

4) Add xircom_cb to /etc/hotplug/blacklist.

I have not excercised the modem function at this time. It used to work under the
2.2 kernel series with seperate pcmcia-cs modules.

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