[Bug 290153] Re: Fails to find boot device in Intel D945Gnt

[Marcel Ibes]

@SpinningAround

I tried your work-around by adding the "all_generic_ide" to the kernel
options and it works!!

So far the good news. Although I can now boot with the latest kernel,
the solution has a negative impact on disk performance:

-------------

With "all_generic_ide" (kernel: 2.6.27-8-generic):

>> hdparm -tT /dev/md1

/dev/md1:
 Timing cached reads:   1768 MB in  2.00 seconds = 884.18 MB/sec
 Timing buffered disk reads:   54 MB in  3.06 seconds =  17.66 MB/sec


Without "all_generic_ide" (kernel: 2.6.27-4-generic):

>> hdparm -tT /dev/md1

/dev/md1:
 Timing cached reads:   1852 MB in  2.00 seconds = 926.06 MB/sec
 Timing buffered disk reads:  318 MB in  3.00 seconds = 105.84 MB/sec


--------------


As you can see the buffered disk reads goes down from 105.84 MB/sec to 17.66 MB/sec on my Raid-0 disk array. 

So thanks for supplying us with a work-around, but for the longer term
we need an actual fix.


Regards,
Marcel


PS.
My motherboard has an NVIDIA chipset.

-- 
Fails to find boot device in Intel D945Gnt
https://bugs.launchpad.net/bugs/290153
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