Hi,

I am maintaining a large-volume HTTP server. It is with one em0
gigabit NIC, and running apache(or thttpd) for users to download
relatively big(>200k) files.

I started this service using 4.5R. It shows about 500Mbit/sec
performance(the server is Pentium III 1G, 1G RAM, 36G SCSI
HDD). Server load was very high(>200) but I heard it's characteristic
of apache server and I decided to upgrade to recent system and use
thttpd instead of apache.

2 days ago I updated the system to 4.6-RELEASE. Whether or not using
apache or thttpd, under some traffic(about >150Mbit/sec), it shows
"watchdog timeout" repeatedly:

Jun 16 11:36:18 gigatest /kernel: em0: Link is Down
Jun 16 11:36:18 gigatest /kernel: em0: Link is up 1000 Mbps Full Duplex
Jun 16 11:40:49 gigatest /kernel: em0: watchdog timeout -- resetting
Jun 16 11:40:51 gigatest /kernel: em0: Link is Down
Jun 16 11:40:51 gigatest /kernel: em0: Link is up 1000 Mbps Full Duplex
Jun 16 11:40:51 gigatest /kernel: em0: Link is Down
Jun 16 11:40:51 gigatest /kernel: em0: Link is up 1000 Mbps Full Duplex
Jun 16 11:44:23 gigatest /kernel: em0: watchdog timeout -- resetting
Jun 16 11:44:24 gigatest /kernel: em0: Link is Down
Jun 16 11:44:24 gigatest /kernel: em0: Link is up 1000 Mbps Full Duplex
Jun 16 11:50:28 gigatest /kernel: em0: watchdog timeout -- resetting
Jun 16 11:50:29 gigatest /kernel: em0: Link is Down
Jun 16 11:50:29 gigatest /kernel: em0: Link is up 1000 Mbps Full Duplex
Jun 16 11:50:30 gigatest /kernel: em0: Link is Down
Jun 16 11:50:30 gigatest /kernel: em0: Link is up 1000 Mbps Full Duplex
Jun 16 11:50:30 gigatest /kernel: em0: Link is Down
Jun 16 11:50:30 gigatest /kernel: em0: Link is up 1000 Mbps FullDuplex
Jun 16 11:50:30 gigatest /kernel: em0: Link is Down
Jun 16 11:50:30 gigatest /kernel: em0: Link is up 1000 Mbps Full Duplex

I updated em0 driver to 1.3.8 from Intel webpage, but it no helps.

Can you suggest some advice? If not, I have to back to 4.5R-p5.

--
 +++ Any opinions in this posting are my own and not those of my employers +++
 CHOI Junho [sleeping now]                    <http://www.kr.FreeBSD.org/~cjh>
 [while sleeping] <cjh @ kr.FreeBSD.ORG> <cjh @ FreeBSD.ORG> <cjh @ wdb.co.kr>
 Korea FreeBSD Users Group <www.kr.FreeBSD.org>   Web Data Bank<www.wdb.co.kr>

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