I/O Scheduling results in poor responsiveness

[Nathan Grennan]

Les Mikesell wrote:
> Can you compare to systems with SCSI drives?  I think this is telling 
> you that your disk controller is eating all the CPU when the 
> controller and DMA should be doing all the work.
>
  Are you saying you think that the controller isn't using DMA? You 
think the controller or driver is just poorly written?

  I will try a SCSI system, but the closest I have is a CentOS 4.6 
machine, which using a kernel based on 2.6.9. It is also a server, so I 
can't run firefox, thunderbird, xchat, or pidgin on it.