Emil Naepflein wrote: > On Mon, 10 Oct 2005 09:54:56 +0300, Marko M?kel? wrote: > > >>On Mon, Oct 10, 2005 at 06:52:12AM +0200, Emil Naepflein wrote: >> >>>This is pretty useless on my system because the loss of responsiveness >>>is mostly caused by the disk accesses and not by cpu usage. >> >>Are you sure that DMA disk transfers are enabled? If not, the copying >>with programmed I/O (PIO) will consume CPU. > > > As I wrote, there is no problem with cpu usage. And DMA is enabled as I > use a Promise SX6000 controller (SCSI interface). The main problem is > that the cutting thread reads and writes the data through the buffer > cache and purges useful data from the buffer cache. Any disk access when > using the menu then is delayed considerably. This is with a 2.4 kernel. > The 2.6 kernel behaves much better in this regard. > > Emil I'm currently in the process of adopting Ralf M?ller's patch to avoid trashing the disk cache. Maybe that will help. Klaus
