manfred@ramz.UUCP (Manfred Blum) (06/11/90)
Hello. Yesterday, I did a diskperf on my A3000/25-100 and got something about 70K/s Read and 38K/s write speed. This seems to be very strange since the A3000 is really fast ;-) Ist it possible that Diskperf does't work on the A3000 ??? -manfred
jesup@cbmvax.commodore.com (Randell Jesup) (06/11/90)
In article <1512@ramz.UUCP> manfred@ramz.UUCP (Manfred Blum) writes: >Hello. >Yesterday, I did a diskperf on my A3000/25-100 and got something about >70K/s Read and 38K/s write speed. >This seems to be very strange since the A3000 is really fast ;-) >Ist it possible that Diskperf does't work on the A3000 ??? >-manfred Check to make sure the mask for the partition is 0xfffffffc. If it's 0xfffffe, then it's set up wrong. You use HDToolBox, partitioning screen, advanced options, change filesystem for partition. Fast ram on the A3000 is above the 24-bit memory space of earlier machines. (0x07xxxxxx) -- Randell Jesup, Keeper of AmigaDos, Commodore Engineering. {uunet|rutgers}!cbmvax!jesup, jesup@cbmvax.cbm.commodore.com BIX: rjesup Common phrase heard at Amiga Devcon '89: "It's in there!"
lphillips@lpami.wimsey.bc.ca (Larry Phillips) (06/14/90)
In <404@nyit.UUCP>, aca@nyit.UUCP (Al Arthur) writes: >In article <12526@cbmvax.commodore.com> jesup@cbmvax (Randell Jesup) writes: >> Check to make sure the mask for the partition is 0xfffffffc. If it's >>0xfffffe, then it's set up wrong. > >I never did figure-out what the mask was really used for, nor what it >should be set to on my machine. Can you explain it to me? (Thanks) It 'masks' the data address such that any address having bits _only_ within the 1 bits in the mask will initiate a DMA transfer, while any bit in the address corresponding to a 0 bit in the mask will cause a programmed IO transfer to to be initiated. Put another way... if ((!Mask) & (DataAddress)) DoProgrammedIO else DoDMA One proper value for a 2000 with a 2630 would be 0xfffffe, which says that you can DMA to any even address in the first 16 MBytes. -larry -- The raytracer of justice recurses slowly, but it renders exceedingly fine. +-----------------------------------------------------------------------+ | // Larry Phillips | | \X/ lphillips@lpami.wimsey.bc.ca -or- uunet!van-bc!lpami!lphillips | | COMPUSERVE: 76703,4322 -or- 76703.4322@compuserve.com | +-----------------------------------------------------------------------+
aca@nyit.UUCP (Al Arthur) (06/15/90)
In article <12526@cbmvax.commodore.com> jesup@cbmvax (Randell Jesup) writes: > Check to make sure the mask for the partition is 0xfffffffc. If it's >0xfffffe, then it's set up wrong. I never did figure-out what the mask was really used for, nor what it should be set to on my machine. Can you explain it to me? (Thanks) I have a 2090A, and early docs on it that don't seem to contain complete information about the Mountlist entries. My machine has a 2630, 2090A, 1)2052, 2) SCSI Disks, 1)TapeDrive Thanks, Al -- Alex Arthur, System Programmer/UUCP Administrator New York Institute of Technology - Computer Graphics Laboratory Gerry House, Old Westbury, New York 11568 Phone:(516) 686-7644 UUCP: ...!{sbcs.sunysb.edu,philabs}!nyit!aca
valentin@cbmvax.commodore.com (Valentin Pepelea) (06/16/90)
In article <404@nyit.UUCP> aca@nyit.UUCP (Al Arthur) writes: >In article <12526@cbmvax.commodore.com> jesup@cbmvax (Randell Jesup) writes: >> >> Check to make sure the mask for the partition is 0xfffffffc. If it's >> 0xfffffe, then it's set up wrong. > > I never did figure-out what the mask was really used for, nor what it > should be set to on my machine. Can you explain it to me? (Thanks) The mask value specifies to what addresses a DMA device may DMA into. A mask value of 0xfffffe means that DMA transfers are restricted to the lower 16Meg address space, word-long transfers please. A value of 0xfffffffc means that DMA transfers may be made to the entire 4 Gigabyte address space, long-word transfers please. Randell was talking about the mask value suggested for A3000's. On these computers, since fast memory resides above the 16Meg boudare, the 0xfffffe mask value effectively restricts DMA transfers to CHIP memory. > I have a 2090A, and early docs on it that don't seem to contain complete > information about the Mountlist entries. My machine has a 2630, 2090A, > 1)2052, 2) SCSI Disks, 1)TapeDrive On other computers, leave the mask value to the factory preset. Valentin -- The Goddess of democracy? "The tyrants Name: Valentin Pepelea may distroy a statue, but they cannot Phone: (215) 431-9327 kill a god." UseNet: cbmvax!valentin@uunet.uu.net - Ancient Chinese Proverb Claimer: I not Commodore spokesman be