Mel Flynn wrote: > On Wednesday 02 September 2009 17:46:46 Alexander Motin wrote: >> Mel Flynn wrote: >>> 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? >> What especially your panic was about? It could be bug in ATA(4) or some >> other code, that does not handle MAXPHYS correctly. I don't think that >> you could reach memory limit during simple system boot because of that. >> I am successfully running my testing Pentium-75 with 64MB RAM with 1MB >> MAXPHYS. >> >> Could you show your panic message? > > It's been a while since I last tried, during 7.1-STABLE. Two different > machines wouldn't boot, both 1.5G; loading kernel.old, then commenting the > MAXPHYS change, rebuilding kernel made things work, so I stopped pursuing this > at the time. > I remember the panic message quite early page fault, one of the first drivers > loaded (ahci or acpi). Since this is supposed to work, I'm going to pursue it > further and see if I can still reproduce it. I have fixed MAXPHYS issue in ata-ahci in RELENG_8, but I haven't merged it lower as code is quite different. So it would be nice if you can check it on 8.x. -- Alexander MotinReceived on Wed Sep 02 2009 - 19:20:53 UTC
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