Re: tx underrun ???
On 2005-11-30 10:20 +0100, Vincent Blondel [EMAIL PROTECTED] wrote: Hello all, When having a look at log files on my web servers, I regulary see next output on the 3COM ethernet interfaces : xl1: transmission error: 90 xl1: tx underrun, increasing tx start threshold to 120 bytes xl1: transmission error: 90 xl1: tx underrun, increasing tx start threshold to 180 bytes xl1: promiscuous mode enabled xl1: promiscuous mode disabled Can somebody explain me what it is and if this situation is normal ? Yes, that's normal. The driver starts putting data on the Ethernet link before the whole packet has been fetched via the PCI bus, under the assumption, that the PCI bus is much faster than the network link. If there are more competing devices on the bus, then the buffer in the controller chip will run out of data (transmitter underrun) and the packet will be garbled (will be sent with a wrong checksum to indicate this). The driver will then increase the amount of data to prefetch (slightly incresing the latency, since it will start sending the packet a few microseconds later). Thus this is kind of a self-tuning of the driver: It starts with an optimistic assumption that the Ethernet chip will get access to the PCI bus with little delay whenever it requests it, but in case this assumption does not hold, the transmission is delayed slightly after loss of one packet (i.e. to avoid more packets to be lost) until the transmission always succeeds with the minimum acceptable amount of prefetching and corresponding delay. Regards, STefan ___ freebsd-stable@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-stable To unsubscribe, send any mail to [EMAIL PROTECTED]
tx underrun ???
Hello all, When having a look at log files on my web servers, I regulary see next output on the 3COM ethernet interfaces : xl1: transmission error: 90 xl1: tx underrun, increasing tx start threshold to 120 bytes xl1: transmission error: 90 xl1: tx underrun, increasing tx start threshold to 180 bytes xl1: promiscuous mode enabled xl1: promiscuous mode disabled Can somebody explain me what it is and if this situation is normal ? Regards Vincent ___ freebsd-stable@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-stable To unsubscribe, send any mail to [EMAIL PROTECTED]
tx underrun ? (add entry into xl manpage)
Vincent Blondel wrote: Hello all, When having a look at log files on my web servers, I regulary see next output on the 3COM ethernet interfaces : xl1: transmission error: 90 xl1: tx underrun, increasing tx start threshold to 120 bytes xl1: transmission error: 90 xl1: tx underrun, increasing tx start threshold to 180 bytes xl1: promiscuous mode enabled xl1: promiscuous mode disabled Can somebody explain me what it is and if this situation is normal ? Rumours are that these messages are harmless, but if someone can explain these messages properly, it would be nice to add an entry to the DIAGNOSTICS section of the xl manpage (hence, this mail also goes to doc mailinglist) I see these messages too on my router/gateway: xl1: transmission error: 90 xl1: tx underrun, increasing tx start threshold to 120 bytes xl1: transmission error: 90 xl1: tx underrun, increasing tx start threshold to 180 bytes xl0: transmission error: 90 xl0: tx underrun, increasing tx start threshold to 120 bytes xl1: transmission error: 90 xl1: tx underrun, increasing tx start threshold to 240 bytes Regards, Rob. __ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com ___ freebsd-stable@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-stable To unsubscribe, send any mail to [EMAIL PROTECTED]
Re: tx underrun ? (add entry into xl manpage)
On Wed, 2005-11-30 at 04:37 -0800, Rob wrote: Vincent Blondel wrote: Hello all, When having a look at log files on my web servers, I regulary see next output on the 3COM ethernet interfaces : xl1: transmission error: 90 xl1: tx underrun, increasing tx start threshold to 120 bytes xl1: transmission error: 90 xl1: tx underrun, increasing tx start threshold to 180 bytes xl1: promiscuous mode enabled xl1: promiscuous mode disabled Can somebody explain me what it is and if this situation is normal ? Rumours are that these messages are harmless, but if someone can explain these messages properly, it would be nice to add an entry to the DIAGNOSTICS section of the xl manpage (hence, this mail also goes to doc mailinglist) I see these messages too on my router/gateway: xl1: transmission error: 90 xl1: tx underrun, increasing tx start threshold to 120 bytes xl1: transmission error: 90 xl1: tx underrun, increasing tx start threshold to 180 bytes xl0: transmission error: 90 xl0: tx underrun, increasing tx start threshold to 120 bytes xl1: transmission error: 90 xl1: tx underrun, increasing tx start threshold to 240 bytes This is from the dc(4) man page: dc%d: TX underrun -- increasing TX threshold The device generated a transmit underrun error while attempting to DMA and transmit a packet. This happens if the host is not able to DMA the packet data into the NIC's FIFO fast enough. The driver will dynamically increase the trans- mit start threshold so that more data must be DMAed into the FIFO before the NIC will start transmitting it onto the wire. I'm assuming the explanation also holds true for other drivers (xl, etc.) that issue this warning. Cheers, Paul. -- e-mail: [EMAIL PROTECTED] Without music to decorate it, time is just a bunch of boring production deadlines or dates by which bills must be paid. --- Frank Vincent Zappa ___ freebsd-stable@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-stable To unsubscribe, send any mail to [EMAIL PROTECTED]
Re: xl0 tx underrun / watchdog errors
On Sat, 22 Sep 2001, Lamont Granquist wrote: So you're suggesting its just this? http://www.freebsd.org/cgi/query-pr.cgi?pr=11869 Yes, that looks exactly like the problem I had. The network would just stop working when copying files to and fro another host. Didn't see the patch though, so I ended up putting an Intel EEPRO in the box instead. Didn't even know that this fix existed. Incrementing to 300 seems to fix my problems completely (integrated NIC in HP Omnibook 6000). Can we get this MFC'd? Looks like it's been in -CURRENT for over two years now... Cheers, AS To Unsubscribe: send mail to [EMAIL PROTECTED] with unsubscribe freebsd-stable in the body of the message
xl0: tx underrun
Hi All! I'm getting these occasionally on my 3.4STABLE box here: xl0: transmission error: 90 xl0: tx underrun, increasing tx start threshold to 120 bytes But it doesnt seem to cause too many problems. However, I get them all the time on another box running 3.4-RELEASE which is a Samba server. If someone hammers the server (usually by running a backup from a Win 98 workstation) it will reliably generate loads of the above error, then lock up solid. The two machines are quite different, the one with the mild symptoms is a Celeron 466 w 256MB RAM and the bad one is a Pentium 133 with 64MB RAM on an Intel HX chipset. -- Irvine Short SANBI Sys Admin tel: +27-21-959 3645 cel: +27-82-494 3828 To Unsubscribe: send mail to [EMAIL PROTECTED] with "unsubscribe freebsd-stable" in the body of the message
