From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S267646AbUHELcf (ORCPT ); Thu, 5 Aug 2004 07:32:35 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S267648AbUHELcf (ORCPT ); Thu, 5 Aug 2004 07:32:35 -0400 Received: from web50802.mail.yahoo.com ([206.190.38.111]:54457 "HELO web50802.mail.yahoo.com") by vger.kernel.org with SMTP id S267646AbUHELcc (ORCPT ); Thu, 5 Aug 2004 07:32:32 -0400 Message-ID: <20040805113228.51997.qmail@web50802.mail.yahoo.com> Date: Thu, 5 Aug 2004 04:32:28 -0700 (PDT) From: mr Subject: using isa - performance degrade? To: linux-kernel@vger.kernel.org MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org hi all i'm running 2.4.26 (debian) with sd's attached to an ncr53c8xx-scsi controller. since the sys is a p133 (the machine acts as a router/gw and knfs) performance isn't all the matters...but i was wondering.. if i would plug the vga-card to an isa slot(now unused& not compiled), one pci would get free to hold an AHA-2940 scsi controller, so i could split disks over the two scsihosts & add a few more. will the additional use of the isa-bus give me a performance impact? sym0: <810> rev 0x2 on pci bus 0 device 12 function 0 irq 10 Vendor: IBM Model: DNES-309170 Rev: SA30 ANSI SCSI revision: 03 Vendor: QUANTUM Model: FIREBALL1080S Rev: 1Q09 ANSI SCSI revision: 02 Vendor: QUANTUM Model: VP32210 Rev: 81H8 ANSI SCSI revision: 02 Vendor: IBM Model: DDRS-34560 Rev: S97B ANSI SCSI revision: 02 another DDRS-34560...cdroms... i won't have a problem with pci-throughput. afaik, with 33MHz-pci it shouldn't be a problem to get data from queries over the bus - those are not quite fast disks (hdparm -t 4,4MBs-fireball, 5,2MBs-VP, >8MBs-IBMs). since i also heard about poor performance of the adaptec-2940, will it be wise to use the second adapter? another issue i'm poring about is using tagged command queueing(VP) / linked commands(fireball) on two disks holding a cache for squid on a reiserfs + swaps. will it improve performance or is the elevator/schedular enough? i know how to set command queueing at bootup but i'm clueless if there is a programm (scsi-tools? do i need sg?) to set various other options for the drives/host? please cc to jkerdawnyahoo.com -i've been on the list for a while, but the traffic..=( thanks a lot & regards ritch. __________________________________ Do you Yahoo!? New and Improved Yahoo! Mail - 100MB free storage! http://promotions.yahoo.com/new_mail