Alex Holst wrote: > Quoting Mark Kettenis ([email protected]): > > An accurate description would be that the percentage is actually the > > percentage of "DMA-reachable" physical memory the buffer cache may > > use. The minimum percentage is 5% and the maximum is 90%. > > > > But documenting it like that needs an explanation of what > > "DMA-reachable" memory is. > > In practice, my amd64 systems with 32GB memory and > kern.bufcachepercent=90 has the cache capped around 3GB. > > This surprised me greatly, so I'm all ears if anyone else has ideas on > how we can document this.
It would be better to fix the underlying issue. Coincidentally, I have a diff in progress, but I'm not quite done with it yet.
