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From: Jens Axboe <>
To: Alan Cox <>
	Linux Kernel Mailing List <>
Subject: Re: PROBLEM: ide-cd in 2.6.8-2.6.10 and 2.4.26-2.4.28 high cpu use with dma
Date: Mon, 10 Jan 2005 09:45:06 +0100	[thread overview]
Message-ID: <> (raw)
In-Reply-To: <1105278277.12004.32.camel@localhost.localdomain>

On Sun, Jan 09 2005, Alan Cox wrote:
> On Sul, 2005-01-09 at 12:30, wrote:
> > A minor mistake. I forgot to state explicitly that the problem only appears
> > with writing audio cds. Writing data cds does not cause problems.
> It sets the required alignment of buffers for DMA. The 2.6.10 code is
> correct, the question is who is feeding unaligned buffers to the driver
> layer - the kernel or the SG layer. Which burning interface are you
> using  - /dev/sg  (ie dev=1,0,0) or /dev/hd*  (dev=/dev/hdc etc)

Look at the check, it's also doing length check. And for cdda burning,
you are never going to have 32-byte alignment, hence it false back to

Jens Axboe

      reply	other threads:[~2005-01-10  8:45 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2005-01-09 10:52 PROBLEM: ide-cd in 2.6.8-2.6.10 and 2.4.26-2.4.28 high cpu use with dma Hikaru1
2005-01-09 10:54 ` Hikaru1
2005-01-09 12:30   ` Hikaru1
2005-01-09 15:32     ` Jens Axboe
2005-01-09 20:47       ` Marcel Sebek
2005-01-10  9:10       ` Hikaru1
2005-01-11  8:25         ` Jens Axboe
2005-01-09 23:01     ` Alan Cox
2005-01-10  8:45       ` Jens Axboe [this message]

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