fxp(4) TCP checksum offloading
andreas-moeller at gmx.net
Sat Jan 17 13:49:38 PST 2004
I got an Intel PRO/100 S NIC (Intel 82550 chip) which supports TCP
checksum offloading. I am also able to load the microcode necessary in
order to activate that feature:
fxp0: Microcode loaded, int_delay: 1000 usec bundle_max: 6
Unfortunately, when enabled, network connections (at least those based
on TCP) start timing out while ping remains working flawlessly. The
system in question is running latest -CURRENT source as of today.
Also, after having put /sbin/ifconfig fxp0 link0 in
/etc/start_if.<interface> (which by the way seems to be undocumented),
the microcode gets loaded but then sshd refuses to start at boot time. I
don't get any error message.
fxp0: <Intel 82550 Pro/100 Ethernet> port 0xdc00-0xdc3f mem
0xe3000000-0xe301ffff,0xe3020000-0xe3020fff irq 11 at device 10.0 on pci0
fxp0: Ethernet address 00:02:b3:4c:9c:32
miibus0: <MII bus> on fxp0
fxp0 at pci0:10:0: class=0x020000 card=0x00408086 chip=0x12298086 rev=0x0d
vendor = 'Intel Corporation'
device = '82550/1/7/8/9 EtherExpress PRO/100(B) Ethernet Adapter'
class = network
subclass = ethernet
Any ideas? (Is there a way to unload the microcode again besides
rebooting the system?)
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