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Date:      Thu, 16 Sep 1999 18:18:21 +0900
From:      Kenjiro Cho <kjc@csl.sony.co.jp>
To:        atm@FreeBSD.ORG
Subject:   Re: CRC errors of en0 at receiver side 
Message-ID:  <199909160918.SAA26315@hotaka.csl.sony.co.jp>
In-Reply-To: Your message of "16 Sep 1999 10:28:52 %2B0200." <wtzwvtr1cqj.fsf@cs.uni-sb.de> 

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Martin Recktenwald <mreckt@cs.uni-sb.de> said:
  > "Kyungran Kang" <krkang@etri.re.kr> writes:
  > I'm configuringng a system for IP over ATM with FreeBSD 3.1.
  > I tried both BSDATM and HARP with Efficient Network Inc. ATM NIC.
  > 
  > I found that hea0(ENI ATM NIC in HARP) works well with Fore ATM Switch 200BX
  > but en0 (ENI ATM NIC in BSDATM) results in severe CRC errors at the receiver side if
  > two ENI ATM NICs are connected by the ATM switch.

>> The same configuration with both FreeBSD 3.0 and 3.2 works perfectly
>> for me, no CRC errors. I never tried FreeBSD 3.1, but AFAIK the en0
>> driver did not change.

CRC errors indicate cell loss at an intermediate ATM switch.
If only en0 has CRC errors with the same configuration, it could be
that en0 sends cells faster than hea0.  (last time I looked, the en
driver uses larger DMA bursts.)

-Kenjiro


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