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From: James Bottomley <James.Bottomley@HansenPartnership.com>
To: Mark Lord <liml@rtr.ca>
Cc: Tejun Heo <htejun@gmail.com>,
	IDE/ATA development list <linux-ide@vger.kernel.org>,
	FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Subject: Re: WARNING: at drivers/ata/libata-core.c:5988 ata_qc_issue()
Date: Fri, 25 Jan 2008 09:01:01 -0600	[thread overview]
Message-ID: <1201273261.3119.4.camel@localhost.localdomain> (raw)
In-Reply-To: <479965C1.3070009@rtr.ca>

On Thu, 2008-01-24 at 23:29 -0500, Mark Lord wrote:
> Tejun Heo wrote:
> > Mark Lord wrote:
> >..
> >> Super!  You've done a great job with this stuff, Tejun!
> > 
> > Thanks but I can't really say nice things about how sata_sil24's
> > qc_defer() is implemented or how we generally handle command deferring.
> >  We really need the control at the higher level - request_queue group.
> > Oh well... I guess you guys will be talking about it over beer again
> > soon.  :-)
> ..
> 
> You too?
> 
> Another one for those beers, is a way to tell the IOMMU code about
> physical segment limitations -- so we can stop having to allocate
> PRD tables 2X as big as necessary in drivers like sata_mv.

If the IOMMU would observe the queue dma_boundary parameter, is that
enough?  (it is for the 64k PRD limit).  If so, there are already
patches in the works to solve this permanently.  If not, could we get
the requirements to see how it might be done?

James



  parent reply	other threads:[~2008-01-25 15:01 UTC|newest]

Thread overview: 17+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-01-24 15:20 WARNING: at drivers/ata/libata-core.c:5988 ata_qc_issue() Mark Lord
2008-01-24 15:26 ` Tejun Heo
2008-01-24 15:56   ` Mark Lord
2008-01-24 23:36     ` Tejun Heo
2008-01-24 23:52       ` Mark Lord
2008-01-24 23:57         ` Tejun Heo
2008-01-25  0:02           ` Mark Lord
2008-01-25  0:07             ` Tejun Heo
2008-01-25  4:01               ` Mark Lord
2008-01-25  4:08                 ` Tejun Heo
2008-01-25  4:29                   ` Mark Lord
2008-01-25  4:36                     ` Tejun Heo
2008-01-25  7:20                       ` Jeff Garzik
2008-01-25  7:18                     ` Jeff Garzik
2008-01-25 15:01                     ` James Bottomley [this message]
2008-01-25 15:18                       ` Mark Lord
2008-01-25 15:29                         ` James Bottomley

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