linux-kernel - Re: SCSI TMF processing; tag allocation

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Message-ID: <1289832794.2233.8.camel@mulgrave.site>
Date:	Mon, 15 Nov 2010 08:53:14 -0600
From:	James Bottomley <James.Bottomley@...senPartnership.com>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
Cc:	Jens Axboe <jaxboe@...ionio.com>, Matthew Wilcox <matthew@....cx>,
	Luben Tuikov <ltuikov@...oo.com>, Greg KH <greg@...ah.com>,
	"linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"tj@...nel.org" <tj@...nel.org>
Subject: Re: SCSI TMF processing; tag allocation

On Mon, 2010-11-15 at 14:40 +0000, Alan Cox wrote:
> > Realistically, tag starvation isn't really a problem.  It was a known
> > issue for 80s era hardware.  I've got some of the oldest drives on the
> > planet and I didn't see a problem when the clock algorithm was removed
> > from 53c700.
> 
> I'm not entirely sure that is the case at least for some early NCQ
> capable ATA drives 8(

OK, since ATA seems to be reinventing all sorts of bad 80s SCSI
behaviour, I'll concede this point.

James


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