Unusual fxp behaviour with link0 flag

Bruce M Simpson bms at spc.org
Sat Feb 14 23:22:52 PST 2004


D'oh! Pardon my lack of sleep.

On Sun, Feb 15, 2004 at 07:20:46AM +0000, Bruce M Simpson wrote:
> I just noticed some unusual behaviour when running an fxp with the link0
> flag set (interrupt coalescing microcode enable).

It might help if I mentioned what it was! Truncated IP datagrams. That is,
only the first 40 bytes or so of every packet were making it through. This
had the effect that I could ping the box, but TCP segments were mysteriously
Going Nowhere, and tcpdump revealed a lot of [|ip].

BMS


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