From: Jens Axboe <axboe@suse.de>
To: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: Hikaru1@verizon.net,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
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: <20050110084501.GA31651@suse.de> (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, Hikaru1@verizon.net 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
pio.
--
Jens Axboe
prev parent 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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