Date: Tue, 08 Apr 2003 19:15:04 +0200 From: Dag-Erling Smorgrav <des@ofug.org> To: Nate Lawson <nate@root.org> Cc: sos@freebsd.org Subject: Re: cvs commit: src/sys/dev/ata ata-all.c ata-all.h ata-chipset.cata-dma.c ata-pci.c ata-pci.h Message-ID: <xzpof3gnc6f.fsf@flood.ping.uio.no> In-Reply-To: <Pine.BSF.4.21.0304081001400.27414-100000@root.org> (Nate Lawson's message of "Tue, 8 Apr 2003 10:09:20 -0700 (PDT)") References: <Pine.BSF.4.21.0304081001400.27414-100000@root.org>
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Nate Lawson <nate@root.org> writes: > Tagged queuing is orthogonal to caching. TQ allows multiple transactions > to be passed to the drive, allowing it to order and aggregate the requests > as it thinks best. TQ can be done with no cache because all the drive is > tracking is handles to transactions (typically 16 bit ids). Think of it > as more like a pipeline than a cache. It can't be done without cache, because you can't queue and reorder transactions without some sort of cache. DES -- Dag-Erling Smorgrav - des@ofug.org
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