fc5 kernels after 1788 have excessive, kernel overhead

[Dave Jones]

On Sat, Dec 31, 2005 at 11:09:33PM +0000, Andy Burns wrote:
 > Dave Jones wrote:
 > 
 > >my people page will have a new kernel with it turned off in about
 > >an hour (buildsys permitting).
 > 
 > Got it thanks, you can certainly feel the difference :-)
 > my previous wget now gets an "expected" 11.1MB/s and eats about 25% CPU 
 > (which feels a bit on the high side)
 > 
 > One weird note though, I accidentally installed the 1806 uniprocessor 
 > i686 kernel, and when it booted it didn't see the SATA drives
 > 
 > ata1 is slow to respond, please be patient
 > ata1 failed to respond (30 secs)
 > scsi0 : ahci
 > ata2 is slow to respond, please be patient
 > ata2 failed to respond (30 secs)
 > scsi1 : ahci
 > 
 > http://adslpipe.co.uk/nosata.jpg it happened twice so no fluke.
 > 
 > I suppose the subsequent panic is justified given that it didn't see the 
 > disks, but why would it not see them? I rebooted back to 1805 smp i686 
 > kernel, installed 1806 smp i686 kernel and now all is well, I can double 
 > check the uniprocessor result if required ...

puzzling. does the UP initrd have the sata modules in it?

If you remove and reinstall the UP kernel, is it repeatably broken?

		Dave