From owner-aic7xxx Tue Oct 6 14:09:45 1998 Return-Path: Received: (from majordom@localhost) by hub.freebsd.org (8.8.8/8.8.8) id OAA21128 for aic7xxx-outgoing; Tue, 6 Oct 1998 14:09:45 -0700 (PDT) (envelope-from owner-aic7xxx@FreeBSD.ORG) Received: from post.mail.demon.net (post-11.mail.demon.net [194.217.242.40]) by hub.freebsd.org (8.8.8/8.8.8) with ESMTP id OAA21027 for ; Tue, 6 Oct 1998 14:09:27 -0700 (PDT) (envelope-from paul@nailed.demon.co.uk) Received: from [158.152.227.248] (helo=ermintrude.magic.com) by post.mail.demon.net with smtp (Exim 2.03 #1) id 0zQeM9-0002iu-00 for aic7xxx@freebsd.org; Tue, 6 Oct 1998 21:09:18 +0000 Received: from dougall.magic.com (dougall.magic.com [192.168.1.22]) by ermintrude.magic.com (8.8.7/8.8.7) with SMTP id WAA02528 for ; Tue, 6 Oct 1998 22:07:27 +0100 Received: by localhost with Microsoft MAPI; Tue, 6 Oct 1998 22:07:24 +0100 Message-ID: <01BDF175.B29F64A0.paul@nailed.demon.co.uk> From: Paul Haigh To: "aic7xxx@freebsd.org" Subject: Synchronous/Asynchronous and Disconnect/Connect? Date: Tue, 6 Oct 1998 22:07:23 +0100 X-Mailer: Microsoft Internet E-mail/MAPI - 8.0.0.4211 MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: owner-aic7xxx@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.org All, Sorry If I'm asking a silly question but here goes anyway: I'm a little confused about the difference between Sync and Async (and also disconnect and connect). I've read a lot of stuff about the changing of harddisc jumper settings to alter the behaviour of the driver under Linux. (To either enable it or disable it) Am I missing a simple trick to speed up my discs? I've got two older Sun Microsystems discs in my linux server (both 4.5Mb SCA drives) The driver purports the following: ------------------------------------------------------------------------ Adaptec AIC7xxx driver version: 5.1.0pre6/3.2.4 Compile Options: AIC7XXX_RESET_DELAY : 15 AIC7XXX_TAGGED_QUEUEING: Adapter Support Enabled Check below to see which devices use tagged queueing AIC7XXX_PAGE_ENABLE : Enabled (This is no longer an option) AIC7XXX_PROC_STATS : Enabled Adapter Configuration: SCSI Adapter: Adaptec AHA-294X Ultra SCSI host adapter Ultra Wide Controller PCI MMAPed I/O Base: 0xe1000000 Adaptec SCSI BIOS: Enabled IRQ: 11 SCBs: Active 0, Max Active 2, Allocated 15, HW 16, Page 255 Interrupts: 47205 BIOS Control Word: 0x19b6 Adapter Control Word: 0x005f Extended Translation: Enabled Disconnect Enable Flags: 0xffff Ultra Enable Flags: 0xfffa Tag Queue Enable Flags: 0x0000 Ordered Queue Tag Flags: 0x0000 Default Tag Queue Depth: 8 Tagged Queue By Device array for aic7xxx host instance 0: {255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255} Actual queue depth per device for aic7xxx host instance 0: {1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1} Statistics: (scsi0:0:0:0) Device using Wide/Sync transfers at 20.0 MByte/sec, offset 8 Total transfers 36744 (21442 read;15302 written) blks(512) rd=71931; blks(512) wr=42780 < 512 512-1K 1-2K 2-4K 4-8K 8-16K 16-32K 32-64K 64-128K >128K Reads: 0 1 18818 434 1170 945 26 27 21 0 Writes: 0 0 13117 1857 266 34 4 3 21 0 (scsi0:0:2:0) Device using Wide/Sync transfers at 20.0 MByte/sec, offset 8 Total transfers 10402 (5637 read;4765 written) blks(512) rd=81923; blks(512) wr=55246 < 512 512-1K 1-2K 2-4K 4-8K 8-16K 16-32K 32-64K 64-128K >128K Reads: 0 1 2581 75 1051 1474 166 107 182 0 Writes: 0 0 3372 760 426 23 15 3 166 0 ------------------------------------------------------------------------ I only get around 5Mb/sec on these drives, which I would say was less than I was expecting. Is the sync/async thing slowing me down? This is running on an Adaptec 2940 UW controller. Thanks for any help in advance. Cheers, Paul Haigh. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-aic7xxx" in the body of the message