elevator=noop solved it for me also, but just as murz says: sometimes under heavy disk activity (dd iso -> empty sata drive) some parts of Xorg will pause, sometimes for several minutes.
I can also see that noop writes to the usb drives without pausing. Normal elevator writes for a few seconds, pause for 1.5 seconds and then keep writing. Noop writes without pauses.
elevator=noop solved it for me also, but just as murz says: sometimes under heavy disk activity (dd iso -> empty sata drive) some parts of Xorg will pause, sometimes for several minutes.
I can also see that noop writes to the usb drives without pausing. Normal elevator writes for a few seconds, pause for 1.5 seconds and then keep writing. Noop writes without pauses.