Red Hat Bugzilla – Bug 63071
Xircom CBEM56G Excessively Slow
Last modified: 2015-01-04 17:01:44 EST
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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):
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.
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.