From owner-freebsd-isp Wed Apr 7 13:52:11 1999 Delivered-To: freebsd-isp@freebsd.org Received: from hostigos.otherwhen.com (dialin2017.pernet.net [205.229.2.17]) by hub.freebsd.org (Postfix) with ESMTP id 63AE21590D for ; Wed, 7 Apr 1999 13:51:59 -0700 (PDT) (envelope-from mavery@mail.otherwhen.com) Received: from mail.otherwhen.com (mail.2.229.205.in-addr.arpa [205.229.2.19] (may be forged)) by hostigos.otherwhen.com (8.8.6/8.7.3) with ESMTP id PAA02127 for ; Wed, 7 Apr 1999 15:58:51 -0500 (CDT) Message-Id: <199904072058.PAA02127@hostigos.otherwhen.com> Received: from PORKY/SpoolDir by mail.otherwhen.com (Mercury 1.44); 7 Apr 99 15:49:52 -0600 Received: from SpoolDir by PORKY (Mercury 1.44); 7 Apr 99 15:49:39 -0600 From: "Mike Avery" To: freebsd-isp@freebsd.org Date: Wed, 7 Apr 1999 15:49:29 -0500 MIME-Version: 1.0 Content-type: text/plain; charset=US-ASCII Content-transfer-encoding: 7BIT Subject: Re: NFS slowness on 100 LAN Reply-To: mavery@mail.otherwhen.com In-reply-to: X-mailer: Pegasus Mail for Win32 (v3.02b17) Sender: owner-freebsd-isp@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.org On 7 Apr 99, at 13:17, Suresh Rajagopalan wrote: > I am seeing very slow response over NFS between a 3.1 client and Solaris > X86 NFS server, with both NIC's set to 100M-FD. Writing a 2MB file takes > 30 seconds. > > Some data points: > 1. The NIC card is a 3COM, and the ifconfig options are set to use > "media 100BaseT mediaopt full-duplex" > 5. The switch is a 3COM Superswitch, with ports forced to 10FD or 100FD, > depending on the machine (autonegotiate is off). I'd turn off the FD. Based on information in another list, when congestion occurs the 3COM switches tend to just drop packets as a means of flow control. The sender has to time out before a retry is attempted. Bad design. A number of other switches do the same thing. All in all, FD may not be quite ready for prime time yet. Also, you didn't mention the box you were using, but there are some documented problems with Compaq boxes and 3Com PCI cards - the cards can only access the bus one fourth as often as it should be able to. All in all, I'm phasing out my 3Com cards. Mike ====================================================================== Mike Avery MAvery@mail.otherwhen.com (409)-842-2942 (work) ICQ: 16241692 * Spam is for lusers who can't get business any other way * A Randomly Selected Thought For The Day: Every time I lose weight, It finds me again! To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-isp" in the body of the message