Date: Sun, 21 Feb 1999 02:20:51 -0800 (PST) From: Matthew Jacob <mjacob@feral.com> To: "Kenneth D. Merry" <ken@plutotech.com> Cc: grog@lemis.com, paulz@trantor.xs4all.nl, freebsd-current@FreeBSD.ORG Subject: Re: Slow seq. write on Seagate ST36530N Message-ID: <Pine.LNX.4.04.9902210218100.1414-100000@feral-gw> In-Reply-To: <199902210201.TAA16287@panzer.plutotech.com>
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> > > > It sounds like a good idea, and it is. What I want to see is scsi_da use > > this automatically. I have never liked the "punch it, Chewey!" approach > > CAM has been taking..... > > What do you mean "scsi_da use this automatically"? > > All of the tagged queueing stuff is controlled in the transport layer. > What are you proposing that the DA driver do? > It is up to a target driver to control properties of performance and reliability on the target device and to mediate between filesystems and that device. The da driver should be checking for and adjusting performance criteria based upon this. Whether it is now currently mistakenly placed in the transport layer (tags are a property of parallel SCSI- tags, qua tags, are not the issue, but the number of parallem operations at a time is) is not the issue. -matt To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message
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