Date: Fri, 18 May 2001 10:47:54 -0400 From: "Christian S." <cschreiber@netrail.net> To: <freebsd-questions@freebsd.org> Subject: RE: TX underrun, increasing TX threshold Message-ID: <MPEGJCJPPBKNCNBGOHGDKEGADJAA.cschreiber@netrail.net> In-Reply-To: <003801c0df21$4874c1a0$2813933f@cat>
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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 I've had the same problem with my xl0 driver (3C905).. I get hideously slow performance transferring between 2 100Mb NIC's, but they are connected via a 100Mb hub.. I haven't tried a x-connect cable 'twixt the two, so I can't blame the NIC's yet.. :/ Christian > -----Original Message----- > From: owner-freebsd-questions@FreeBSD.ORG > [mailto:owner-freebsd-questions@FreeBSD.ORG]On Behalf Of pan > Sent: Thursday, May 17, 2001 6:33 PM > To: freebsd-questions@FreeBSD.ORG > Subject: Re: TX underrun, increasing TX threshold > > > > From: "Peter" <fbsdq@yahoo.com> > Subject: TX underrun, increasing TX threshold > > > > What exactly does this error mean and how can I avoid it? > > [It appears while doing heavy/big file transfers between my LAN > on my dc0 > [linksys] ] > > Newer Linksys seem to have (ADMtek AN985) chips instead of the > (82c169 PNIC) > ones. > (check your boot message). > The dc0 driver never produces the underrun event with the PNIC > while with the ADMtek > it does. > What it is, bascially, is that your system could not produce data > fast enough for your > nic. There's more to it - buffer size etc, but the message says > that your system has > decided to increase the number of bytes to fill the buffer before > the nic can send. > This can occur more than once after a boot until the system and > the nic are > happy with > each other - once a reset is found the messages stop and everything > is ok. if you reboot > you will see the messages again. the event occurs only within a LAN > where you have > a linespeed greater than 10Mbs - if you were only trafficking > through your gateway to > the net (via a dsl bridge/router for example) at the max > linespeed of 10Mbs > you wouldn't > see the message. I bet you only see it when you reach > n x > 1024kbps linespeed within your > LAN. > > I think the dc0 driver intializes the nic with too small a number > of bytes - > it certainly > isn't true on the physical layer that the system hardware can't > keep up with > the nic - > it's a handshaking thing. > > Corrections and additions welcome. > > Pan > > > > > > > > _________________________________________________________ > > Do You Yahoo!? > > No. > > > Get your free @yahoo.com address at http://mail.yahoo.com > > No thanks. > > > > To Unsubscribe: send mail to majordomo@FreeBSD.org > with "unsubscribe freebsd-questions" in the body of the message -----BEGIN PGP SIGNATURE----- Version: PGPfreeware 6.5.8 for non-commercial use <http://www.pgp.com>; iQA/AwUBOwU1uCkK9qTvGvteEQIg2QCeIA+HSrW+7O4zz+mUqmMQG6HzZtMAnipj Oi3yfM742YWKoFUwcCrgRN0E =vod8 -----END PGP SIGNATURE----- To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
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