Date: Wed, 14 Feb 2001 20:38:26 -0600 From: "Josh Paetzel" <jpaetzel@hutchtel.net> To: <freebsd-questions@FreeBSD.ORG>, "Lowell Gilbert" <lowell@world.std.com> Subject: Re: tx underrun Re: (none) Message-ID: <00c801c096f8$722ecf20$6100000a@vladsempire.net> References: <200102131639.f1DGdWj14713@cwsys.cwsent.com> <44bss5qke7.fsf@lowellg.ne.mediaone.net>
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----- Original Message ----- From: "Lowell Gilbert" <lowell@world.std.com> To: <freebsd-questions@FreeBSD.ORG> Sent: Wednesday, February 14, 2001 10:50 AM Subject: tx underrun Re: (none) > Cy.Schubert@uumail.gov.bc.ca (Cy Schubert - ITSD Open Systems Group) writes: > > > I came into work this morning and notice the following in my xconsole: > > > > xl0: transmission error: 90 > > xl0: tx underrun, increasing tx start threshold to 120 bytes > > > > What would cause a tx underrun? The only cause of any large amount of > > traffic from my desktop system was a Veritas backup. > > A tx underrun is caused by the computer not keeping up with the NIC > rather than the other way around, so it's basically a question of what > was keeping the computer from servicing the buffer-empty interrupts. > Any other interrupt that took too long being serviced could do that, > so it's hard to say what caused it in this case. > > A tx underrun is not in itself a problem, however. The messages are > important because they may help sometimes in tracking down other > problems, but a single underrun, which doesn't repeat with a larger > transmit buffer, is nothing to be concerned over. It's virtually > unavoidable on slower PCs, depending on the type of NIC. > > Really? I get them on LNE100TX's all the time. I have a p3-700 256 megs ram that has load avererages of 0.00 0.00 0.00 that will spit out tx under-runs if I try to ftp something off it. Josh > To Unsubscribe: send mail to majordomo@FreeBSD.org > with "unsubscribe freebsd-questions" in the body of the message > To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
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