Bugzilla – Bug 142273
Periodic network breakdowns
Last modified: 2007-02-22 20:33:10 UTC
Hi, I'm running a ThinkPad A30 since 4 years under various flavours of SuSE. Now, after installation of 10.0, I have regular, periodic breakdowns of the network. A ping to a machine reports in between: ping: sendmsg: No buffer space available From various sources I found that buffer memory might be an issue: tp-a30:/home/axel # sysctl net.ipv4.tcp_mem net.ipv4.tcp_mem = 12288 16384 24576 tp-a30:/home/axel # sysctl net.core.wmem_max net.core.wmem_max = 113664 tp-a30:/home/axel # sysctl net.core.rmem_max net.core.rmem_max = 113664 OK, but this did not really help in solving the issue - esp. as it seems to be new in 10.0
Are you running any other significant amount of network traffic while pinging? What network card are you using? Any heavy memory usage? Please provide hwinfo output and attach it to this report. Thanks!
Last time it occured I had only KDE and the mail program (Polarbar Mailer, a java mail client) up and running. No other memory or network usage. Network card: Have a look at www.axxite.com/brn/en/a30.html , there I have all hardware information entered. output of hwinfo is attached
Created attachment 62701 [details] output of hwinfo
The card is an e100 on board NIC. Never heard of trouble with these. Please try using the eepro100 driver; just for testing whether that makes a difference. If it does, it would point to a problem in the e100 driver.
With the eepro100 it does not work very well. Looks the e100 is better. I was trying to reproduce, my favorite for the moment to reproduce is: - have an NFS-mount running - have the automounter running - send the laptop to hibernation - wake it up again, and it is likely that the problem occurs. Seems it does not occur if the automounter is not running, but I cant finally confirm this yet.
Can you trigger this without the hibernation step? That would significantly reduce the scope of the debugging.
Just was thinking about giving you the update that I had the problem right after a reboot, without autofs or hibernation: The mail application logs in to one mail account (larger amount of mails in, failed last time due to the network down). Right after the login was successful, the 'no-buffer' message appeared. Can this be a reason (Sorry, I'm a no-programmer)?
Please try to increase the debug output for this card, before please post 'ethtool eth0' output. You can set the messagelevel with 'ethtool -s eth0 msglvl 0xf4' Look at /var/log/messages if a hang occurs. Please try to avoid hibernation. And please check also the network cable, some days ago I was looking at a similar problem myself and it was a broken contact. The ping output basically means, that the networkstack doesn't sent out packets and the queues are full at some point.
for the last time it was running like clockwork, today it appeared again: Settings for eth0: Supported ports: [ TP MII ] Supported link modes: 10baseT/Half 10baseT/Full 100baseT/Half 100baseT/Full Supports auto-negotiation: Yes Advertised link modes: 10baseT/Half 10baseT/Full 100baseT/Half 100baseT/Full Advertised auto-negotiation: Yes Speed: 100Mb/s Duplex: Full Port: MII PHYAD: 1 Transceiver: internal Auto-negotiation: on Supports Wake-on: g Wake-on: g Current message level: 0x000000f4 (244) Link detected: yes Ater the hang, /var/log/messages displayed: kernel: e100: eth0: e100_update_stats: exec cuc_dump_reset failed
Does the problem still exist with more current versions ?
Got the info from Axel offline: 10.2 dosn't show this problem anymore.