Re: CRC errors with gem(4)

[Julian Coleman <jdc%coris.org.uk@localhost>]

Hi,

> If I understand you correctly, the implication here is that the
> bytes are being transmitted corrupt.

Yes.

> At what packet rate (pps) do you start to see problems?

Sending 10 16k UDP frames with ttcp shows up the problem, so this at most
110pps.

> Is hardware checksum enabled?
> If so, does disabling it improve matters?

No.  No.  The card doesn't really support UDP checksums, so I've disabled it.

> Are there any comments/workarounds in opensolaris code
> for a problem that resembles this?

Unfortunately not.

One thing I tried was to increase the size of the TX descriptor ring.  This
made the problem disappear for 10 frames, but it's still there at 100 frames.

Thanks,

J

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