On Tue, 2003-11-18 at 12:02, Thomas Backlund wrote: > From: "James Sparenberg" <[EMAIL PROTECTED]> > > On Tue, 2003-11-18 at 03:32, Angelo Naselli wrote: > > > So there isn't any problem is it? > > > I saw this thing because of a system that seems to be > > > slower and with more hd access so i assumed the > > > message > > > > > > ide: Assuming 33MHz system bus speed for PIO modes; > > > override with idebus=xx > > > > > > as something wrong on my system. > > > > No problem. You might try doing hdparm -m 32 to see if it speeds up > > disk access. But the reference to PIO mode would only affect you > > directly if you had some really old HDD's or CD drives on the box. The > > PIO IDE bus and the UDMA IDE bus are "different" (Although I don't have > > all of the details on the difference.) and you use one but not the > > other. > > > > Actually the bus is the same, it's only the data flow protocol on the bus > that changes...
True enough I knew what I meant ... not what I said. *grin* > > running the bus in pio mode means that your cpu workload will get high > since it has to "be in charge" of moving all the data to and from ram... > > but when the bus is running dma, the data from the hdd to ram will bypass > your cpu (and leave it free for other work) and rely an the dma controller > to > make sure the data gets to/from ram. > > going from dma to udma adds crc32 checking to the transfers, thus enabling > higher transfer speeds without transfer errors ... > > So, in short... to gain full speed from a pio hdd, your cpu will run with > 60-99% workload, whereas running udma will keep it around 3-5% > > ( of course your might see different values, but this was only a generic > example) > > -- > Regards > > Thomas > > > > > ______________________________________________________________________ > Want to buy your Pack or Services from MandrakeSoft? > Go to http://www.mandrakestore.com
Want to buy your Pack or Services from MandrakeSoft? Go to http://www.mandrakestore.com
