On Apr 29, 2008, at 2:08 PM, Jeremy Chadwick wrote:
tcpdump reporting "bad cksum" can occur due to TX/RX checksum
offloading. Do you not see this message normally, but only when the
problem begins?
Have you tried turning off TX/RX offloading to see if the erroneous
behaviour goes away?
Have you tried disabling RFC1323 to see if that's actually what's
responsible for the stalls you're seeing? sysctl
net.inet.tcp.rfc1323=0
I'd recommend staying away from Realtek NICs. Pick up an Intel Pro/
1000
GT or PT. Realtek has a well-known history of issues.
Now Ive tried:
ninja# sysctl net.inet.tcp.rfc1323=0
net.inet.tcp.rfc1323: 1 -> 0
ninja# ifconfig re0 -rxcsum -txcsum -tso -lro
The problem remains, but when I have -rxcsum/tx tcpdump does not say
anything
about bad checksums but it send out the same ack over and over.
and it seems like bigger files are the most effected (images rather
then html-files)
I know, I have em in all other machines.. :/
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