Re: Abysmal PATA IDE performance

[Stephen Clark]

Arjan van de Ven wrote:

> > Probably your drives are renamed.
> > Before you had (wild guess, look at your boot log messages):
> > - ata bus -> hdc,hdd
> > - sata -> sda (if you really have any sata bus...)
> >
> > Now all hdX become sdX, and PATA is detected _before_ SATA, so you names
> > probaly became:
> > - ata via libata -> sda (HD), sr0 (CDROM)
> > - sata -> sdb.
> >    
>
> on fedora this doesn't matter (due to mount-by-label)
>
> the bigger problem I suspect is that the sata modules aren't part of the
> initrd!
>
> you can force the issue by adding
>
> alias scsi_hostadapter1 ata_piix
>
> to the /etc/modprobe.conf file, and then recreating the initrd
> (see the mkinitrd tool, or just install the kernel rpm)
>
>
>
>
>  
Thanks all.

Arjan, using combined_mode=libata and making a new ramdisk increased my 
xfer rate from 1.xx mb/sec to 28.xx mb/sec.

I am curious as to why my friends dell inspiron 8200 with a 1.8ghz p4 
and the same drive using the same drive with FC6 and the standard ide 
module gets 44 to 45 mb/sec.

Steve

--

"They that give up essential liberty to obtain temporary safety, 
deserve neither liberty nor safety."  (Ben Franklin)

"The course of history shows that as a government grows, liberty 
decreases."  (Thomas Jefferson)



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