Am Fr, den 23.01.2004 schrieb Alexander Dalloz um 20:27: > Am Fr, den 23.01.2004 schrieb Robert D. Arendt um 19:18: > > Steve Saady wrote: > > > I have a Promise Ultra 66 eide controller, but think it is only being > > > acessed at 33 Mhz. I have looked around, but have not found how to > > > ascertain what rate Fedora is using it at. > > > Is there a way to configure FC1 to use it at 66MHz? > > > > > <snip> > > > > > > dmesg|more : > > > ide: Assuming 33MHz system bus speed for PIO modes; override with idebus=xx > > > > > I added idebus=66 to /etc/grub.conf, so my boot line now looks like: > > kernel /vmlinuz-2.6.1-1.53smp ro root=LABEL=/ apm=off idebus=66 > > should work with the nominal FC1 kernel as well. Really boosted my > > disk I/O speed. > > > > Hope this helps, > > -Bob Arendt > > What kind of hardware are you running - no PC ware or even very old EISA > bus hardware? > > idebus=66 is nonsense and might even be dangerous on normal PC hardware, > as simply the bus frequency is 33 MHz and nothing else! > > How did you measure the speed boost? Please compare the speed at > idebus=33 and with your setting of idebus=66 and post your values and > how you measured the I/O speed values. > > Alexander To be clear once again: idebus=66 does NOT mean ATA 66 nor idebus=33 means ATA 33! The UDMA setting is normally best self-detected by the kernel but can be modified with "hdparm -X xx" (between the borders the hardware allows). Alexander -- Alexander Dalloz | Enger, Germany PGP key valid: made 13.07.1999 PGP fingerprint: 2307 88FD 2D41 038E 7416 14CD E197 6E88 ED69 5653
