Subject: Re: DVD burning still have problems
From: Kasper Sandberg <lkml@metanurb.dk>
To: Jens Axboe <axboe@suse.de>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>,
       Alessandro Suardi <alessandro.suardi@gmail.com>,
       Volker Armin Hemmann <volker.armin.hemmann@tu-clausthal.de>,
       Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
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Date: Fri, 28 Jan 2005 15:45:46 +0100
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first, sorry for posting so much :|
On Fri, 2005-01-28 at 15:05 +0100, Kasper Sandberg wrote:
> On Fri, 2005-01-28 at 14:47 +0100, Jens Axboe wrote:
> > On Fri, Jan 28 2005, Kasper Sandberg wrote:
> > > On Mon, 2005-01-24 at 23:48 +0000, Alan Cox wrote:
> > > > On Llu, 2005-01-24 at 23:01, Kasper Sandberg wrote:
> > > > > > there are certainly chipset and CPU errata in this area.
> > > > > would this mean that i should not use cpu frequency scaling?
> > > > 
> > > > Worth an experiment but I'd be suprised if it was your fix. The more
> > > > data the better however 
> > > I disabled cpufreq in the kernel, acpi i still have in kernel.. when i
> > > booted i did acpi=off, and changed IO scheduler to anticipatory
> > > i just burned a DVD, and it works ;D pretty neat, im not sure what
> > > caused it. but im glad.. i still have the small change in scsi_ioctl.h,
> > > however nothing appears in dmesg.. gonna burn one more dvd in a little
> > > bit, if it doesent work, i will let you know, if you dont hear more
> > > about it, assume it works :DD
> > > 
> > > btw: the reason i changed to anticipatory from cfq is that i noticed
> > > that sometimes the speed dropped abit, and thought it might have
> > > something to do with it, and, with as it did not
> > 
> > That's interesting, a short io starvation could for sure cause it. I
> > would really appreciate if you could try one change at the time though,
> > right now it's not really clear if it's acpi or the io scheduler.
> well.. all good things must come to an end.. the second dvd i burned
> failed.. :(
> this is really frustrating.. but im pretty pretty sure its not media
> error..
> perhaps i must reboot after each burn again.. anyway, it is nice knowing
> everything isnt completely lost :)
i just rebooted, (and booted with acpi off, anticipatory like before)
and burned a DVD, and it works.. this means that when acpi is disabled,
cpufreq off, i have the same problems i initially had with earlier
kernels (2.6.9-rc*)

that is: i could burn 1 dvd, which works fine, then the next i burn
fails, with io error, then the third i burns works.. in short, every
second works.. unless i reboot after each, then no one fails..

its a insanely strange problem. :) but atleast im able to get abit free
hd space now :)


> 
> > 
> 
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