MAXPHYS and physical memory (Was: Re: siis/atacam/ata/gmirror 8.0-BETA3 disk performance)

Mel Flynn mel.flynn+fbsd.current at
Wed Sep 2 15:28:25 UTC 2009

On Wednesday 02 September 2009 16:51:35 Alexander Motin wrote:

> For maximum linear I/O performance you may want to build kernel with
> options 	MAXPHYS=(1024*1024)

I've found that just doubling the default MAXPHYS already panics-on-boot a 
1.5GB i386 system. Is there any reasonable conversion table for MAXPHYS to 
physical memory, since various memory related kernel setups are derived from 
or calculated with MAXPHYS?

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