larry@nstar.rn.com (Larry Snyder) (02/19/91)
rob@xyzoom.info.com (Rob Lingelbach) writes: >I've been trying to compile smail3 for my system running ISC 2.2. >I get through building the dependencies, but about 10 minutes into >building the binaries, the kernel panics. It never happens at exactly >the same place--just generally during heavy disk I/O. I also get some >random errors in component files, that don't appear to exist when I >examine them. >The processor is a 25 MHz 386 w/64k cache, 8 MB RAM, the controller is >an Adaptec 1542B with a Maxtor 207 MB drive. >I have replaced the controller and the drive, with no change. I've >tried adding BIOS wait states to the Adaptec, with no effect. >Is anyone else having this problem? Thanks. chances are your motherboard isn't compatible with the DMA on the Adaptec 1542B -- Did you run the DMA test under DEBUG (using DOS) on the 1542B? another issue is the DMASPEED and BUSSON/BUSSOFF paramaters in the kernel -- -- Larry Snyder, NSTAR Public Access Unix 219-289-0287 (HST/PEP/V.32/v.42bis) regional UUCP mapping coordinator {larry@nstar.rn.com, ..!uunet!nstar.rn.com!larry}
aland@informix.com (Colonel Panic) (03/01/91)
In article <1991Feb19.134450.6095@nstar.rn.com> larry@nstar.rn.com (Larry Snyder) writes: >... >chances are your motherboard isn't compatible with the DMA on the >Adaptec 1542B -- Did you run the DMA test under DEBUG (using DOS) >on the 1542B? > >another issue is the DMASPEED and BUSSON/BUSSOFF paramaters in >the kernel -- > Larry Snyder, NSTAR Public Access Unix 219-289-0287 (HST/PEP/V.32/v.42bis) Am I *blind*? I've got TFM right in front of me, and the only DMA- or bus-related parm I can find is DMAEXCL... where did you find out about DMASPEED and BUSS*? (or were these pre-2.2?) -- Alan Denney aland@informix.com {pyramid|uunet}!infmx!aland I'm Pro-Anarchy... and I Vote!
larry@nstar.rn.com (Larry Snyder) (03/03/91)
aland@informix.com (Colonel Panic) writes: >Am I *blind*? I've got TFM right in front of me, and the only DMA- or >bus-related parm I can find is DMAEXCL... where did you find out about >DMASPEED and BUSS*? (or were these pre-2.2?) no, your not blind - none if this is covered in the manual - here is part of my file: #define AHA_BUSON 9 /* 5&9 defaults */ #define AHA_BUSOFF 5 /* 10 & 5 were working until recently */ #define AHA_DMASPEED 4 /* 1 for 6.7 mhz, 2 for 8 mhz, 3 for 10 mhz */ /* 4 for 5.7 mhz */ ok, the first two defs are 5 and 9 by default - as you can see I have them reversed which increased disk IO by around 31% here on nstar raising these paramaters too much will cause the floppy drive to overrun next is DMA Speed - I have mine at 4 (5.7mhz) - my other motherboard (a SOYO) supported up to 8 megs (2) without problems but my current 386/33 can't handle anything higher than 5.7 without cause problems when the systems gets very loaded by tweaking these defs and rebuilding the kernel it is possible to make a noticable increase in diskio -- but it is also possible to screw up your disk - - use caution - and make backups -- -- Larry Snyder, NSTAR Public Access Unix 219-289-0287 (HST/PEP/V.32/v.42bis) regional UUCP mapping coordinator {larry@nstar.rn.com, ..!uunet!nstar.rn.com!larry}