Messages in this thread | | | Subject | Re: [2.2.9] performance problem on 100MBit network | Date | Thu, 27 May 1999 15:11:08 +0200 (MEST) | From | (Rogier Wolff) |
| |
David S. Miller wrote: > Date: Sat, 22 May 1999 16:08:30 +0200 > From: Jochen Heuer <jogi@planetzork.ping.de> > > Sometimes I get ping times of up to 20 seconds(!) while normaly > ping times are ~0.3ms. If this happens I have to reboot either my > server or my client. > > What can I do to debug this if it happens again? > > Let me guess, you see this behavior on systems where DHCP is running > in some way? And it happens about when a client rebinds, and the > machine in question is going ARP crazy if you watch it on the network > with tcpdump?
Another possibility is that he has an RTL8139 card in the machine. There is an obscure bug in that driver that causes the card to get a certain "backlog". One packet is transmitted for every packet received.
If that's the case, Jochen will see that if he starts a parallel ping to the same machine on a different xterm, the ping-times will drop to 10s.
I haven't had time to debug this yet. (and stupid me, the machine has gone into production :-( )
> Did I guess right?
Did I guess right?
Roger.
-- ** R.E.Wolff@BitWizard.nl ** http://www.BitWizard.nl/ ** +31-15-2137555 ** *-- BitWizard writes Linux device drivers for any device you may have! --* ------ Microsoft SELLS you Windows, Linux GIVES you the whole house ------
- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.rutgers.edu Please read the FAQ at http://www.tux.org/lkml/
| |