linux-kernel - Re: Abysmal PATA IDE performance

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Date:	Thu, 09 Nov 2006 09:39:53 -0500
From:	Stephen Clark <Stephen.Clark@...lark.us>
To:	Arjan van de Ven <arjan@...radead.org>
CC:	"\"J.A.\" Magallón" 
	<jamagallon@....com>,
	Björn Steinbrink <B.Steinbrink@....de>,
	Mark Lord <lkml@....ca>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	alan@...rguk.ukuu.org.uk
Subject: Re: Abysmal PATA IDE performance

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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