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Date:      Tue, 28 Jan 2003 17:19:46 -0600
From:      Redmond Militante <r-militante@northwestern.edu>
To:        freebsd-questions@freebsd.org
Subject:   tx underrun error when ftp'ing large file
Message-ID:  <20030128231946.GA550@darkpossum>

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--huq684BweRXVnRxX
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hi
=20
i get the following error
=20
l0: transmissions error: 90
xl0: tx underrun, increasing tx start threshold to 120 bytes
=20
when trying to ftp a large tar.gz file to a dell poweredge network storage =
appli
ance.
=20
the commands i'm using to upload this large tar.gz file are:
=20
ftp -n -v storageappliance.organization.com
user myaccount
mypassword
bin
prompt
mput largefile.tar.gz
=20
-i've used this method to ftp smaller tar.gz files, but when i try to uploa=
d thi
s large file (several gig in size) i get the tx underrun error, and the tra=
nsfer

 freezes.

i've done some research on this error

i've found the following off the mailing list archives:

"According to:
http://www.freebsd.org/cgi/getmsg.cgi?fetch=3D1651362+1653480+/usr/local/ww=
w/db/te
xt/1999/freebsd-questions/19990926.freebsd-questions

Tx under runs occur when the tx state machine cannot get packet
data from memory fast enough to keep up with wire transmit
rate. Setting the start threshold higher increases the number
of bytes which are buffered in the tx fifo which increases the
allowable bus latency.

And according to the linux driver for the 3com cards:
Tx underrun (not enough PCI bus bandwidth).

It's not a problem as far as I know, if the message stops (depending on how
mutch traffic there is on your network, at my FreeBSD box it sometimes rize=
s to
300 bytes) the systems works fine. "

so - i'm wondering if anyone has deal w this type of issue before, and if s=
o, how to configure my nic card to perform this type of ftp transfer.

any advice would be appreciated
thanks again
redmond

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