Re: RX2800 sporadic disk I/O slowdowns

On Sat, 19 Oct 2024 21:22:08 -0400, Arne Vajhøj wrote:

On 10/19/2024 9:04 PM, Lawrence D'Oliveiro wrote:
>

Here’s another question: why does a disk controller need a battery-

backed-

up cache? Or indeed any cache at all?

 
Better performance.

Think about it: the OS already has a filesystem cache in main RAM. That
runs at main RAM speeds. Whereas the disk controller is connected through
an interface to the CPU suitable only for disk I/O speeds. So any disk
controller cache is on the wrong side of that interface.