Messages in this thread | | | Subject | Re: [Bug 12309] Large I/O operations result in slow performance and high iowait times | From | Thomas Pilarski <> | Date | Sat, 03 Apr 2010 21:19:48 +0200 |
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> > 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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