Re: [Bug 12309] Large I/O operations result in slow performanceand high iowait times

[Thomas Pilarski]

> > 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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