Red Hat Bugzilla – Bug 55627
Slows network when loaded
Last modified: 2007-04-18 12:38:00 EDT
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Description of problem:
When using RP-PPPoE 3.2-3, upon typing "adsl-start", all network functions
(ftp and samba in my test case), slow down drastically. RP-PPPoE 2.6-5
(that comes with RedHat 7.1) does not exhibit this problem, and
downgrading to this version fixes the problem. The only way i can manage
to recover from the 3.2-3 slowdown is to reboot.
Version-Release number of selected component (if applicable):
Steps to Reproduce:
1. Start playing a movie (served up by Samba) on a different computer via
2. Type "adsl-start".
Actual Results: Movie plays fine until a few seconds after adsl-start is
typed. The movie then stutters constantly and won't play properly until i
Expected Results: Movie should not stutter.
As i said, RP-PPPoE 2.6-5 that comes with RedHat 7.1, installed onto
RedHat 7.2, does not exhibit the problem. RP-PPPoE 3.2-3 that comes with
RedHat 7.2, does exhibit the problem.
Two points that i want to make clear:
1. By rebooting, i mean that i have to reboot the RedHat box serving the movie
to solve the problem. Only after a clean reboot without running adsl-start does
the movie play back smoothly.
2. Not even adsl-stop will fix the network slowdown. Rebooting seems like the
strange, i cannot reproduce this problem. it works for me here
please check if you run adsl-start in debugging mode?
How could it work if you only type adsl-start? Do you have DSL configuration
i recommend you should use ifup/ifdown to start/stop DSL connection instead
adsl-start is not running in debug mode, no.
Yes, i have my configuration in /etc/ppp/pppoe.conf.
I'm not sure how to use ifup/ifdown. I can't seem to find any information on
it. Could you point me to a resource on the web? Why isn't adsl-start/adsl-stop
the best way to connect/disconnect? The HOWTO on rp-pppoe's website doesn't
mention ifup/ifdown at all, only adsl-start.
I don't know what other information i can give you. I just upgraded to rp-pppoe
3.2-3 to try it again, started playing a movie over the network (it's running
fine and smooth), typed adsl-start, and within a few seconds my network has now
slowed to a crawl again, the movie stuttering. I've downgraded to 2.6-5, run
adsl-start adsl-stop, tried ifdown eth0 then ifup eth0, and the problem
persists. What else can i try apart from rebooting? By the way, 'top' shows 94-
97% idle CPU time.
we have a new config tool 'redhat-config-network' in 7.2, which allows you to
setup your network/dialup/DSL ...
This new config tool puts all the configuration fies under
/etc/sysconfig/network-scripts/ (for DSL /etc/sysconfig/network-scripts/ifcfg-ppp0)
To start/stop DSL connection just do ifup/ifdown ppp0
could you please give me your /etc/ppp/pppoe.conf?
Created attachment 36449 [details]
Configuration file for RP-PPPoE
I tried the redhat-config-network tool, and then did ifup ppp0 with rp-pppoe
3.2 and i still had the same problems.
By the way, does it matter that i am using the same ethernet card for both ADSL
and my LAN? I have set up eth0 as 192.168.3.1, and ADSL to use eth0, and i am
doing the tests on eth0/192.168.3.1.
of course the network slow down drastically if you use the same ethernet card
for both ADSL and LAN !
In normal case it won't work!
To fix this problem you have to have 2. network adapter for your DSL
But why does RP-PPPoE 2.6 work fine, and 3.2 doesn't? And why, even when i adsl-
stop/ifdown, does the network remain slow and bugged? This shouldn't happen and
it points clearly towards a bug in 3.2. I should be able to use LAN and ADSL
via the same ethernet card. The ethernet card is 100Mbps FD plugged into a
100Mbps FD switch with the ADSL modem on the switch's uplink. Even with ADSL
downloading at its maximum speed (512Kbps mine is), i should still get (and do
get with RP-PPPoE 2.6) ~9+MB/s via the LAN.
please try ftp://people.redhat.com/than/7.2/rp-pppoe-3.3-2
It works! There is no slowdown on my network after running adsl-start. The
movie is still running smoothly and ftp is getting 8.5-9.5MB/s, even while
downloading at maximum speed via ADSL. Great! Thanks! I wonder what the problem
with 3.2 was?