Improving disk performance by changing VirtualMemory path
|Reported by:||haiqu||Owned by:||kallisti5|
|Has a Patch:||yes||Platform:||All|
Currently the haiku BFS is a little slow. My guess is that DMA transfers have not yet been enabled.
There is a simple interim solution. By allowing the user to select a virtual memory path on a separate drive - preferrably on another bus entirely - disk swapping speed can be increased significantly. This is due to the fact that the physical heads in your drive need to change what they're doing to service a virtual memory call.
By placing the virtual memory on a separate bus, optimum improvement is gained due to the fact that the PC's controller is now less loaded, and because there is now less data on the bus.
I believe this would be a fairly simple change, and very worthwhile even in the long-term. Checking to ensure the drive is mounted and recreating virtual memory if this fails is about all the extra work required.
No change would be noticed in systems with a single HDD, but then again no improvement is available from Haiku's ability to run SMP either if you only have one CPU ...