From owner-freebsd-atm Thu Sep 16 2:18:27 1999 Delivered-To: freebsd-atm@freebsd.org Received: from inetfw.sonycsl.co.jp (inetfw.SonyCSL.Co.Jp [203.137.129.4]) by hub.freebsd.org (Postfix) with ESMTP id 58C5A150AD for ; Thu, 16 Sep 1999 02:18:24 -0700 (PDT) (envelope-from kjc@csl.sony.co.jp) Received: from hotaka.csl.sony.co.jp (root@hotaka.csl.sony.co.jp [43.27.98.57]) by inetfw.sonycsl.co.jp (8.9.3+3.2W/3.7Ws3/99071615) with ESMTP id SAA08798 for ; Thu, 16 Sep 1999 18:18:23 +0900 (JST) Received: from localhost (kjc@[127.0.0.1]) by hotaka.csl.sony.co.jp (8.8.8/3.7Ws3/hotaka/99071615) with ESMTP id SAA26315 for ; Thu, 16 Sep 1999 18:18:22 +0900 (JST) Message-Id: <199909160918.SAA26315@hotaka.csl.sony.co.jp> To: atm@FreeBSD.ORG Subject: Re: CRC errors of en0 at receiver side In-reply-to: Your message of "16 Sep 1999 10:28:52 +0200." Date: Thu, 16 Sep 1999 18:18:21 +0900 From: Kenjiro Cho Sender: owner-freebsd-atm@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.org Martin Recktenwald said: > "Kyungran Kang" 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 To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-atm" in the body of the message