I retried my 2.8GB copy tests on the -generic kernel after manually
switching to deadline scheduling and back to cfq, and for me the desktop
is definitely more responsive under deadline (note: I didn't try
writeback or any other settings, just the scheduling).

In one test with deadline scheduling firefox didn't grey out at all, and
in another it greyed out twice but only for half a second or so (and
nautilus greyed out once for a couple of seconds). With cfq, firefox was
greying out for five to ten seconds at a time. Irrespective of which
scheduling I choose, the average throughput reported by nautilus is the
same.

Thanks to Anil, Tobias, and Ravindran for the info about how to change
the scheduling.

@Thomas Pi: I actually don't normally have problems with vmware-server
1.05 (XP runs at a similar speed to natively), but I find that
occasionally the VM will get itself into a state where it thrashes the
disk whenever I try to do something (even scrolling), and at this point
it becomes unusable like you say. Sometimes vmware-server does this when
I first boot the VM, in which case it takes forever to boot. Whenever it
happens, a power reset from the VMWare menu fixes the problem. So maybe
there's a separate bug in vmware that is making it look like this bug?

-- 
Heavy Disk I/O harms desktop responsiveness
https://bugs.launchpad.net/bugs/131094
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