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SubjectRe: TCP/PPP bug 2.3.5?
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> months ago) throughput between my two boxen on a private ethernet segment
> has dropped by a factor of over 100 from almost half a MB to just a few KB

half MB is a bit low but ok

> per second. tcpdump shows only a few packets per second and ifconfig
> shows 1 carrier error about every 2 seconds on the tx side and the same
> number of frame errors on the rx side. The send queue on the tx side gets

framing/carrier errors are consistent with a hardware problem or low level
driver problem. The framing is done in hardware, carrier errors are hardware
and framing on rx errors are hardware level. What devices are you using for
this ?

> filled to capacity and stays there until the transfer is complete. I
> think this is a network stack problem and not a hardware problem because
> ping -f gets 0% packet loss (one run lost 10 packets out of 60,000). This
> only happens with bulk transfer, interactive sessions are perfectly fine.

ping -f is a meaningless test, it generates no long back to back frames,
and few frames with pessimal ethernet clocking.


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