1. Troubleshooting network/driver issue (Marvel 88E8001)
Hi all,
Im trying to understand what the cause Im seeing for a network issue
Im experiencing is (strongly suspect its the drivers for the network
card but...).
Hardware in question is a integrated Marvell 88E8001 Gigabit Ethernet
Controller (rev 13) on an Asus A8V Delux motherboard. Its running
SuSE 10 and using the sk98lin driver.
The symptoms are that several services (pop3 mail collection, web
based adinistration tools, perl generated pages served via apache but
NOT normal webpages) will intermitantly pause downloading (an 8-x
second delay), and then sometimes resume, sometimes timeout. What is
strange though is that I can do ftp or http downloads of large files
to or from the server and get a prity constant datarate and dont have
any issues with timeouts. Im seeing this problem on 2 (identical)
machines and am reasonably certain it isnt a hardware issue.
In fact the issue sounds very similar to this post
http://groups.google.co.uk/group/fa.freebsd.current/browse_thread/thr...
However manually changing the cards speed down to 10Mbps had no
effect. Persuing the problem I thought Id look at the tcpdump output
for pop3 since its quite easy to replicate the issue and found several
lines similar to the following occuring when the service dropout
occurs.
15:10:43.258919 IP xxxxxxxco.uk.36393 > yyyyyyy.co.uk.pop3: . ack
94067 win 65535
15:10:43.279091 IP xxxxxxxco.uk.36393 > yyyyyyy.co.uk.pop3: . ack
94067 win 65535 <nop,nop,sack 1 {95527:96987}>
15:10:43.283153 IP xxxxxxxco.uk.36393 > yyyyyyy.co.uk.pop3: . ack
94067 win 65535 <nop,nop,sack 1 {95527:98447}>
15:10:43.289235 IP xxxxxxxco.uk.36393 > yyyyyyy.co.uk.pop3: . ack
94067 win 65535 <nop,nop,sack 1 {95527:99555}>
15:10:54.390129 IP yyyyyyy.co.uk.pop3 > xxxxxxxco.uk.36391: P
14115:15575(1460) ack 52 win 5840
15:10:54.408015 IP xxxxxxxco.uk.36391 > yyyyyyy.co.uk.pop3: . ack
18154 win 61497
There could be anything from 1 to 3 lines containing nop,nop,sack 1
before the service would pause/timeout. I will admit I dont understand
the abot tcpdump output though so Im clueless as to what its telling
me...
Im at a loss here to undestand quite what is going on and how to fix
it (apart from putting a new network card in which Id prefer not to
since both machines are colocated).
Can anyone offer any advice on how to continue investigating the
problem or any possible solutions?
Many thanks
Lee
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