From owner-freebsd-net Sat Sep 14 13:39: 8 2002 Delivered-To: freebsd-net@freebsd.org Received: from mx1.FreeBSD.org (mx1.FreeBSD.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 6542137B405 for ; Sat, 14 Sep 2002 13:39:04 -0700 (PDT) Received: from ns.flncs.com (srv.flncs.com [12.27.148.74]) by mx1.FreeBSD.org (Postfix) with ESMTP id 0613343E65 for ; Sat, 14 Sep 2002 13:39:04 -0700 (PDT) (envelope-from moti@flncs.com) Received: from win (cable [12.164.45.65]) by ns.flncs.com (Postfix) with ESMTP id 5D09E106A0; Fri, 13 Sep 2002 18:07:46 -0400 (EDT) Message-ID: <003201c25b71$f03c4930$f901a8c0@win> From: "Moti Levy" To: "Steve Fettig" , References: Subject: Re: Network Transfer Speed Issues - Tweaks/Advice? Date: Fri, 13 Sep 2002 18:07:14 -0400 MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2600.0000 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2600.0000 Sender: owner-freebsd-net@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.org i my expirience it's ot the etwork but the file types ..... is it a large amount of small files or a small amount of large files . i get over 400kb a sec when transfering large ( 1gb + ) files files but 7.2kb a sec when copying our small files ( 1 to 5 kb each but over 300,000 of them ) if it's the case with you AFAIK there's not much you can do but change IO devices . Moti ----- Original Message ----- From: "Steve Fettig" To: Sent: Friday, September 13, 2002 5:58 PM Subject: Network Transfer Speed Issues - Tweaks/Advice? > Hi, > > I already asked this one in questions thinking that I should try there > before hitting the net list. Since I haven't received any responses, I > was hoping someone here might have a clue. > I recently set up an NFS server to run daily backups on. The server was > built using an old P150 w/ 90 MB of ram and a 6GB hard drive. (All > servers in this experiment are set up using FBSD 4.6.2 and the client is > a Mac PowerBook G4 running Mac OS X.) Attached to it is an external > SCSI hard drive enclosure with 4 47GB SCSI drives running off an > AHA-2490UW SCSI adapter. I am getting really odd performance when doing > an NFS transfer (I also get odd performance out of scp) from the machine > I am trying to back up. I will get a burst of 20Mbps for about 30 > seconds, then it will ramp down to 1 Mbps for about 2 minutes, ramp > backup to 20 Mbps, then back down to 1 Mbps and so on. It take > absolutely forever to do any high volume transfer at this rate. I > originally thought it was a faulty NIC, so I swapped out my 3Com 509B > Fast Etherlink card for an Intel Pro 10/100 card. The switch between > cards and also between PCI slots has made no difference. When I run the > same setup on a PIII 1GHz machine, the results are completely > different. I get average transfer rates of 20-40 Mbps between the > client and server using the same ethernet hardware. I have also set up > another test on a dual PII-450 and have the same luck as with the PIII 1 > GHz machine. This is using the same network cables and adapters, but > between faster machines. > I don't have any other services other than NFS running on the old P150, > so I don't understand what would be the root of the problem. > Is there something I can tweak in the kernel config that would help me > attain higher, consistent throughput or am I out of luck with the older > machine? (By the way, soft updates are enabled on all of the machines. > MaxUsers is set to 0 on the P150 and to 128 on the PIII 1 GHz, but from > what I have read in the Handbook, setting MaxUsers to 0 only helps the > system decide what is best given the current configuration.) If needed > I can also attach my current kernel config... > > Thanks, > Steve > > > To Unsubscribe: send mail to majordomo@FreeBSD.org > with "unsubscribe freebsd-net" in the body of the message > > > To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-net" in the body of the message