linux-kernel - Re: [Bug 12309] Large I/O operations result in slow performance and high iowait times

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Date:	Sat, 03 Apr 2010 21:19:48 +0200
From:	Thomas Pilarski <Thomas.Pilarski@...or.de>
To:	Henrique de Moraes Holschuh <hmh@....eng.br>
Cc:	linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Jens Axboe <jens.axboe@...cle.com>
Subject: Re: [Bug 12309] Large I/O operations result in slow performance
 and high iowait times

> > This problem is enormous increased, while the ultra bay disc is acceded
> > with udma2 instead of udma6 (caused by another bug), 
> 
> There is a thinkpad BIOS bug that could cause that: it will not signal a
> 80-wire cable when you hot-add an HD on a PATA ultrabay.  Exists at least on
> all T4x, including the T43.

It's a SATA untrabay disk. There is a 40-wire message, but sometimes it
works and sometimes not. I could not figure out, when it does and when
not. 

> The fix is to whitelist these thinkpads for high-speed UDMA even on 40-wire
> cables.  The workaround is to add a kernel command line parameter (I forget
> which).
> 
> Does that match your udma2 instead of udma6 problem?

Thanks. I will try it. But have to finish another project first. 



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