From owner-freebsd-smp Fri Sep 6 5:46:14 2002 Delivered-To: freebsd-smp@freebsd.org Received: from mx1.FreeBSD.org (mx1.FreeBSD.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 8983E37B400 for ; Fri, 6 Sep 2002 05:46:11 -0700 (PDT) Received: from grafin.fujimori.cache.waseda.ac.jp (grafin.fujimori.cache.waseda.ac.jp [133.9.152.154]) by mx1.FreeBSD.org (Postfix) with ESMTP id DA5C443E3B for ; Fri, 6 Sep 2002 05:46:10 -0700 (PDT) (envelope-from fujimori@grafin.fujimori.cache.waseda.ac.jp) Received: from grafin.fujimori.cache.waseda.ac.jp (localhost [127.0.0.1]) by grafin.fujimori.cache.waseda.ac.jp (8.12.3/8.12.3) with ESMTP id g86Ck7oQ001578 for ; Fri, 6 Sep 2002 21:46:09 +0900 (JST) (envelope-from fujimori@grafin.fujimori.cache.waseda.ac.jp) Message-Id: <200209061246.g86Ck7oQ001578@grafin.fujimori.cache.waseda.ac.jp> To: freebsd-smp@freebsd.org Subject: AHA39260 Date: Fri, 06 Sep 2002 21:46:07 +0900 From: Yoriaki FUJIMORI Sender: owner-freebsd-smp@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.org Dear Listers, I have been feeling annoyed by the following funny phenomenon. I am using Iwill DP400 dual xeon boxes and 4.6.2R. On one of them, I installed Adaptec 39260 dual u160 channel 64bit scsi card to 64bit PCI slot, and attatch one disk to each channel. When I invoked `make buildworld', it takes about 50 min, while, on other FreeBSD boxes with the same motherboard and cpus, Adaptec 29160 64bit scsi card (to 64bitslot) and one LVD HDD, it takes only 28 min. Could some kind souls explain why dual channel scsi runs slower than single channel on 64bit slots? Thanks in advance. Yoriaki Fujimori To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-smp" in the body of the message