Hello, I don't understand your answer Nicolas. Because My bus is 33MHz I get 27MB/s. I understand that. What I'm asking is if the UDMA(100) means that the HD is capable of 100MB/s and the bus holds it back. Does it mean that with a newer motherboard my HD will work much faster?
Yuval Scharf On Tue, 19 Aug 2003, Nicolas STURMEL wrote: > Scharf Yuval wrote: > > Hello, > > > > Can someone explain to me the following log messages from the kernel: > > > > ide: Assuming 33MHz system bus speed for PIO modes; override with idebus=xx > > ICH2: IDE controller on PCI bus 00 dev f9 > > ICH2: chipset revision 2 > > ICH2: not 100% native mode: will probe irqs later > > ide0: BM-DMA at 0xff00-0xff07, BIOS settings: hda:DMA, hdb:pio > > ide1: BM-DMA at 0xff08-0xff0f, BIOS settings: hdc:DMA, hdd:DMA > > hda: 39102336 sectors (20020 MB) w/512KiB Cache, CHS=2434/255/63, UDMA(100) > > > > Using `hdparm -t /dev/hda5` I get ~27MB/s. > > Does it mean that my bus holds back my HD. > > Shouldn't I get 100MB/s? > > Can I do something to improve performance. > > > > What a 'hdparm' day ;-) > > Just read the manual pageof hdparm and you will see that the '-t' flag > only gives your _Hard Drive_ speed. And a 27MB/s data rate is quite > corect for an IDE Hard Drive. > My latest Seagate Barracuda is given at 55MB/s, and my old Baracuda IV > 80GB is given at 30MB/s. > In fact, i do not think that hdparm can easily reach the theorical IDE > bus speed, as the '-T' flag ( the second of the only two bench flags I > know ) gives system mem-buffer I/O speed. > > -- > Nicolas > > > -- > [EMAIL PROTECTED] mailing list > > -- [EMAIL PROTECTED] mailing list
