From owner-freebsd-questions Tue Sep 10 16:37:36 2002 Delivered-To: freebsd-questions@freebsd.org Received: from mx1.FreeBSD.org (mx1.FreeBSD.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id BF30337B400 for ; Tue, 10 Sep 2002 16:37:33 -0700 (PDT) Received: from sage-one.net (adsl-65-71-135-137.dsl.crchtx.swbell.net [65.71.135.137]) by mx1.FreeBSD.org (Postfix) with ESMTP id EA9E243E3B for ; Tue, 10 Sep 2002 16:37:32 -0700 (PDT) (envelope-from jackstone@sage-one.net) Received: from sagea (sagea [192.168.0.3]) by sage-one.net (8.11.6/8.11.6) with SMTP id g8ANbWS06057 for ; Tue, 10 Sep 2002 18:37:32 -0500 (CDT) (envelope-from jackstone@sage-one.net) Message-Id: <3.0.5.32.20020910183731.00fbeac8@mail.sage-one.net> X-Sender: jackstone@mail.sage-one.net X-Mailer: QUALCOMM Windows Eudora Pro Version 3.0.5 (32) Date: Tue, 10 Sep 2002 18:37:31 -0500 To: freebsd-questions@freebsd.org From: "Jack L. Stone" Subject: DD copy is too slow Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Sender: owner-freebsd-questions@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.ORG Am running FBSD 4.5-RELEASE On one of the servers, am having very slow real dd copy speed vs test and don't know why. Below is the test first made that shows 25MB/s but the real dd copy is only doing about half the speed. Other servers are matching the test. Wonder what is wrong with this machine I/O....?? DD TEST ONLY dd if=/dev/ad0c of=/dev/null bs=128k sageame@sagec$ iostat ad0 1 tty ad0 cpu tin tout KB/t tps MB/s us ni sy in id 18 4 0.00 0 0.00 0 0 0 0100 88 58 128.00 200 25.06 0 0 2 0 98 20 48 128.00 200 25.01 0 0 2 0 98 0 44 128.00 200 25.00 0 0 1 1 98 0 44 123.32 203 24.45 0 0 1 1 98 0 44 128.00 187 23.39 0 0 1 0 99 0 44 128.00 189 23.65 0 0 0 0100 74 57 128.00 191 23.89 0 0 3 1 96 34 50 128.00 192 24.01 0 0 1 3 96 DD REAL COPY dd if=/dev/ad0 of=/dev/ad1 bs=128k sageame@sagec$ iostat ad0 1 tty ad0 cpu tin tout KB/t tps MB/s us ni sy in id 18 4 0.00 0 0.00 0 0 0 0100 48 50 128.00 88 10.99 0 0 0 0100 0 44 128.00 88 11.02 0 0 1 0 99 0 44 128.00 87 10.89 0 0 1 0 99 0 44 128.00 88 11.02 0 0 1 0 99 0 44 128.00 87 10.89 0 0 0 0100 48 53 128.00 88 11.02 0 0 0 0100 60 53 128.00 88 11.02 0 0 1 0 99 Best regards, Jack L. Stone, Administrator SageOne Net http://www.sage-one.net jackstone@sage-one.net To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message