Date: Tue, 12 Nov 2002 17:03:43 -0500 (EST) From: Dan Ellard <ellard@eecs.harvard.edu> To: Chris Dillon <cdillon@wolves.k12.mo.us> Cc: freebsd-fs@FreeBSD.ORG, <freebsd-hackers@FreeBSD.ORG> Subject: Re: how to control tagged queueing? Message-ID: <Pine.BSF.4.44.0211121702590.91995-100000@bowser.eecs.harvard.edu> In-Reply-To: <20021112120159.Y41695-100000@duey.wolves.k12.mo.us>
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On Tue, 12 Nov 2002, Chris Dillon wrote: > > I'm experimenting with the effects of SCSI tagged queueing on file > > system performance. Is there any kind of global toggle somewhere in > > the kernel to turn tagged queueing on and off, and/or knob to limit > > the number of outstanding tags? Tagged queue management all seems > > to be done at the device level, and I haven't found hooks for > > controlling it at a higher level (but I thought I'd ask before > > running off to write something). > > > > I'm running 4.6.2p4, in case things have changed. (If there's a > > nicer interface in 4.7, I'll install it immediately!) > > man camcontrol > > Specifically: > > camcontrol tags [device id] [generic args] [-N tags] [-q] [-v] > camcontrol negotiate [device id] [generic args] [-T enable|disable] Thanks, that's exactly what I needed. And thanks to the other people who have responded! -Dan To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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