One other thought- to get an idea of real speeds you might try copying one of your entire source trees with cp -r dir1 dir2 Or something like that
On Wed, Dec 9, 2020 at 6:30 AM Riccardo Mottola <riccardo.mott...@libero.it> wrote: > Hi, > > > Brian Morris wrote: > > % time cat <huge_file >huge_file_copy > > > > Install smartctl to check drive health > > > > I also have a PowerBook 1ghz which is quite a bit faster than my > > 1.5ghz tho could be because the former has a bit more ram and a newer > > hard drive and the latter has a defective 2nd ram slot > > I wanted to investigate this further - except smartctl, I did more > extensive checks with file copying which are interesting, also, now that > keyboard works again, I investigated better what dmesg says. > Here some results: > > dd if=/dev/zero of=output.dat bs=1M count=128 > > PB: 158 MB/s > iBook: 117 MB/s > > dd if=/dev/zero of=output.dat bs=1M count=256 > > PB: 9.4 28.5 MB/s > iBook: 4.8s 56 MB/s > > Copy of 256MB file > PB: 5.18 s > iBook: 2.7 s > > This means that for 128MB there is some "cache effect" and there the > PowerBook beats the iBook. But with 256MB the iBook is almost twice as > fast! 28.5 MB/s is less than UDMA/33... quite slow... > Both the iBook and PowerBook still have PATA of course, since no serial > ata devices existed back then > > the iBook has > [ 3.774751] pata-pci-macio 0002:20:0d.0: Activating pata-macio > chipset UniNorth ATA-6, Apple bus ID 3 > [ 3.775921] scsi host0: pata_macio > [ 4.802731] pata-macio 0.00020000:ata-3: Activating pata-macio > chipset KeyLargo ATA-3, Apple bus ID 0 > [ 4.810545] scsi host1: pata_macio > > I bet the first one is the Hard Disk, the second one is for the optical > drive. > > The PowerBook appears also to have the same UniNorth and KeyLargo... so > I doubt there is a driver issue? Apple reused the same chips. > However: > on the PowerBook the ata1 attaches as UDMA/100 ATA-6. > on the iBook I get UDMA/100 ATA-8 > > Is this ATA-8 all the reason of being faster? Is just the PB using a > slow HD? or it does not negotiate or get recognized to full speed? > Wondering! for both UDMA/100 indicates 100MBytes top speed. > ATA-8 appears to be a hybrid drive... with a cache, I don't think that > part can explain speed up for a 256MB file! internet search says it is > an 8MB cache. > > Riccardo > >
