home *** CD-ROM | disk | FTP | other *** search
- Newsgroups: comp.dcom.sys.cisco
- Path: sparky!uunet!boulder!recnews
- From: Pasha Quadri <quadri@last-call.cisco.com>
- Subject: Re: Routers and NFS traffic
- In-Reply-To: Your message of Tue, 5 Jan 1993 06:29:18 GMT
- Message-ID: <726264384.1282@news.Colorado.EDU>
- Sender: news
- Date: 5 Jan 93 10:03:24 PST
- Approved: news
- X-Note1: message-id generated by recnews
- X-Note2: mail msgid was <CMM.0.90.2.726257004.quadri@last-call.cisco.com>
- Lines: 44
-
-
- Hello Mike,
-
- > Some colleagues and I were discussing a subnet design the other day, and
- > someone said that, for performance reasons, one shouldn't put a router
- > between two hosts that have a "lot" of NFS traffic between them.
- >
- > The reason given was that the router would have to decode every UDP packet
- > in order to route it correctly, thus introducing unacceptable delays during
- > heavy file transfer periods.
- >
- > It is my impression that a decently powered router (like maybe an MGS) would
- > be able to handle bursty, UDP-intensive applications like NFS with no problem.
- >
-
- It is OK to NFS across networks that are ether-to-ether via a cisco
- but do avoid it if you want to do it across a WAn that does not
- consist of a full T1. If you see a lot of retarnsmissions, you should
- use rsize and wsize parameters of mount to select smaller
- transmissions. The 8K UDP packets sent by NFS are always fragmented to
- begin with. Since most routers today match the ethernet mtu on serial
- lines and therefore additional fragmentation is unlikely to occur.
- A protocol like RFS (I think it is developed by AT&T), based on TCP
- and actually runs over streams which means, you can run it over UDP,
- TCP, CLNS etc is maybe what is needed for such applications !?
-
-
-
-
- > Can anyone give me some insight on this?
- >
- > Please email responses, and thanks in advance.
- >
-
- > Mike Cantu
- > mike@nit.PacTel.COM
-
-
- Regards
-
-
- Pasha Quadri
- Customer Engg.
-
-