From owner-freebsd-scsi Sat Jun 13 20:12:57 1998 Return-Path: Received: (from majordom@localhost) by hub.freebsd.org (8.8.8/8.8.8) id UAA10123 for freebsd-scsi-outgoing; Sat, 13 Jun 1998 20:12:57 -0700 (PDT) (envelope-from owner-freebsd-scsi@FreeBSD.ORG) Received: from roma.coe.ufrj.br (jonny@roma.coe.ufrj.br [146.164.53.65]) by hub.freebsd.org (8.8.8/8.8.8) with ESMTP id UAA10115 for ; Sat, 13 Jun 1998 20:12:53 -0700 (PDT) (envelope-from jonny@jonny.eng.br) Received: (from jonny@localhost) by roma.coe.ufrj.br (8.8.8/8.8.8) id AAA26981 for scsi@freebsd.org; Sun, 14 Jun 1998 00:12:52 -0300 (EST) (envelope-from jonny) From: Joao Carlos Mendes Luis Message-Id: <199806140312.AAA26981@roma.coe.ufrj.br> Subject: 100% interrupt time ? To: scsi@FreeBSD.ORG Date: Sun, 14 Jun 1998 00:12:52 -0300 (EST) X-Mailer: ELM [version 2.4ME+ PL40 (25)] MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: owner-freebsd-scsi@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.org Hi, I was checking a JAZ disk today, and noted that during a whole disk dd the time spent in interrupt mode (as told by top) was almost 100%. My machine is a PPro/200, and the Jaz is in it's own controller, aic0. Is this expected ? I know that the aic support is not perfect, as stated in it's sources, but in a dd with large block sizes the machine is almost unusable. Or is it a JAZ "feature" ? The jaz drive was at a 2940 controller at first, by I changed it because heavy usage in the jaz media made the whole system slower. At first I thought that the SCSI bus beeing busy with a non-disconectable device would slow all devices, including the system disks. Maybe I was wrong ? Jonny -- Joao Carlos Mendes Luis M.Sc. Student jonny@jonny.eng.br Universidade Federal do Rio de Janeiro To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-scsi" in the body of the message