Date: Thu, 28 Sep 2000 20:05:26 +0200 (CEST) From: Mads Bondo Dydensborg <madsdyd@challenge.dk> To: "'aic7xxx@FreeBSD.ORG'" <aic7xxx@FreeBSD.ORG> Subject: How does the driver determine the Synchronous transfer rate? Message-ID: <Pine.LNX.4.21.0009281958110.7180-100000@challenge.dk>
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Hi there. I am having trouble with a 2940UW (7881U) and a Quantum Atlas III drive. In one machine I get: Sep 28 18:59:40 sci11 kernel: (scsi1:0:-1:-1) Scanning channel for devices. Sep 28 18:59:40 sci11 kernel: (scsi1:0:0:0) Synchronous at 40.0 Mbyte/sec, offset 8. This is as it should be, and gives me a nice performance. Same hardware in another machine very similar machine (they should be identical, same adaptec BIOS setup) I get: Sep 28 19:06:17 sci10 kernel: (scsi1:0:-1:-1) Scanning channel for devices. Sep 28 19:06:17 sci10 kernel: (scsi1:0:0:0) Synchronous at 20.0 Mbyte/sec, offset 8. What gives? The disk now performs with about 50 % of the speed of machine 1. I am confused. I have tried to figure out how the driver (5.1.20) determines the Synchronous rate. I haven't been able to figure it out. Is there any way I can set this rate during module install or in the source? Mads -- Mads Bondo Dydensborg. madsdyd@challenge.dk Remember, never ask a geek "why"; just nod your head and back away slowly... To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe aic7xxx" in the body of the message
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