Subject: Re: Serious IDE problem still present in 2.6.14
From: David Ronis <ronis@ronispc.chem.mcgill.ca>
Reply-To: David.Ronis@mcgill.ca
To: Stefan <gentoopower@yahoo.de>
Cc: linux-kernel@vger.kernel.org
In-Reply-To: <436A9C30.3080705@yahoo.de>
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Organization: Department of Chemistry, McGill University
Date: Thu, 10 Nov 2005 22:46:33 -0500
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I've been busy and have been a bit late responding to this.  In short,
have a problem with disk performance on a HP Pavilion laptop in the
2.6.1[34] kernels (it works fine under 2.6.12.x).  I've summarized much
of the tests I've run on in a post to linux-kernel and linux-ide (when
we thought it was a problem in the ATIIXP module) at:

   http://marc.theaimsgroup.com/?l=linux-kernel&m=112802950411697&w=2

After working with Stefan for a bit, we determined that the problem is
in the ACPI modules (in fact setting ACPI=ht at boot fixes it, although
other things seem to break, as described below).  Stefan suggested I
repost the bug to the linux-kernel list, and so here it is.

David

On Fri, 2005-11-04 at 00:24 +0100, Stefan wrote:
> David Ronis wrote:
> 
> >Hi Stefan,
> >
> >Did you receive my e-mail with the results of your suggestion?
> >  
> >
> Ah sometimes yahoo marks some mails from the list as spam.
> 
> Anyways, I just looked through the changelog from 2.6.12 to 2.6.13, lots
> of acpi changes.
> It looks like the problem is within the acpi code.
> 
> Just send another mail to linux-kernel kernel list instead of linux-ide
> and tell them about your problem.
> 
> I'd send along the hdparm tests 'hdparm /dev/hda' + 'hdparm -i /dev/hda'
> with both kernels and the 'dmesg' output of both + 'lspci -vv'
> 
> To my believe it is unlikely, that any changes in the drivers for ide or
> atiixp are responsible for your performance loss.
> 
> >I've been playing around a bit more; specifically, I tried booting with 
> >apci=ht (without noapic) as was suggested by someone from my earlier
> >post on the linux-kernel list.  This alone seems to fix the problem (as
> >did your suggestion).  Now however, X doesn't work because 
> >
> >"The /dev/input/event* device nodes seem to be missing"
> >
> >I don't know if your suggestion gives the same problem, but my bet is
> >that it does.  
> >
> >Anyhow, if you didn't receive my last e-mail, I'll resend it (it has the
> >output of dmesg as well as some timings).
> >
> >Thanks again.
> >
> >David
> >
> >
> >On Tue, 2005-11-01 at 11:05 +0100, Stefan wrote:
> >  
> >
> >>Lets try something different,
> >>
> >>boot your machine with those arguments:
> >>
> >>noapic acpi=off
> >>
> >>If you use grub, just press e to edit the boot command and add these
> >>flags to the existing line which boots your kernel.
> >>Lets see if this makes any performance difference
> >>
> >>	
> >>
> >>	
> >>		
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> >>    
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> >
> >  
> >
> 
> 
> 	
> 
> 	
> 		
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