I'm pretty certain that most DOS installations use a minimal setting for the BUFFERS= directive in config.sys. I've never seen anything over 30.
Cache pollution is not an issue when your cache is already tiny - it's always being flooded. The BUFFERS cache primary exists to pick up the easy case of sectors being read or modified close in time, like during a FAT update before extending a file or reading the next cluster number from the FAT when doing a sequential read. And they have their biggest impact on floppy accesses, which are horrible. Look at it like this .. loading almost any program is going to wipe out the buffers cache. We're not protecting anything by keeping INT 25/26 traffic out of it.
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