Date: Sat, 11 Sep 1999 00:20:28 -0700 From: Don Lewis <Don.Lewis@tsc.tdk.com> To: "Justin T. Gibbs" <gibbs@caspian.plutotech.com>, Andrew Gallatin <gallatin@cs.duke.edu> Cc: "Justin T. Gibbs" <gibbs@plutotech.com>, scsi@FreeBSD.ORG, gibbs@FreeBSD.ORG, anderson@cs.duke.edu Subject: Re: data corruption when using aic7890 Message-ID: <199909110720.AAA06762@salsa.gv.tsc.tdk.com> In-Reply-To: "Justin T. Gibbs" <gibbs@caspian.plutotech.com> "Re: data corruption when using aic7890" (Sep 10, 4:36pm)
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On Sep 10, 4:36pm, "Justin T. Gibbs" wrote: } Subject: Re: data corruption when using aic7890 } >My tweak didn't seem to help either. The default setting seem to } >be the most reliable. Should I continue to tweak this variable, or do } >you have other ideas? } } I would continue to tweak the variable. I assume you tried setting } the read threshold to MIN and the write threshold to MAX? In other } words, don't start a read from host memory until the FIFO is almost } empty, and don't start a write to host memory until the FIFO is almost } full. The assumption here is that PCI is faster than the SCSI bus } speed so we'll get the longest bursts this way. Please tell me that this hardware doesn't silently corrupt data on a FIFO underflow or overflow without at least setting a flag somewhere ... I've got one of these at home and am getting ready to put three more in service at work. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-scsi" in the body of the message
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