Re: Re: Configuring DMA Access

["adwint pandora be" <adwint pandora be>]

Great article!  More, more!!

BTW, is this tool available in RED HAT 9?  I can hardly wait to check it out.  
Though I work in a million dollar (euro) entreprise, at work we don't run Linux (can you imagine?)

How to deal with a boss who happily announced we would soon "upgrade" (!) to WinXP???

Albert



------------------------
 redhat-install-list redhat com wrote:
------------------------
	
>There's a good article on optimizing IDE drives
>http://pierre.mit.edu/compfac/linux/Securing-Optimizing-Linux-RH-Edition-v1.
>3/chap6sec74.html
>or
>http://linux.oreillynet.com/pub/a/linux/2000/06/29/hdparm.html
>
>
>The idea is to use the hdparm utility to check your current settings. You
>can also use hdparm to change current configuration. However you should
>exercise caution when choosing the DMA modes.
>
>For example my Intel controller supports UDMA5 (ATA100) which is the case
>for most recent boards and hard drives.
>
>So I usually use something like
>hdparm -A1 -c3 -d1 -X69 /dev/hda
>
>-c1 enables 32-bit I/O
>-d1 enables DMA
>-X69 enables ATA/100
>
>You can check disk performance before/after changes by typing
>hdparm /Tt /dev/hda
>
>I found that after installing RH7.1 the test gave me 2.66Mbytes/s transfer
>rate. Changing hdparm to enable UMDA5 now gives me 43Mbytes/s! This is with
>a Western Digital 120Go, 8mo cache hard disk.
>
>
>Daniel
>----- Original Message -----
>From: "Tiago Maduro-Dias" 
>To: 
>Sent: Friday, May 23, 2003 5:32 PM
>Subject: Configuring DMA Access
>
>
>> Hi!
>>
>> I installed my Red Hat Linux 9 system recently. I have been told that
>> one should configure the DMA access in order to take full advantage of
>> the hardware, however, I'm not sure how to do it nor if it has to be
>> done.
>>
>> What I would like to know is:
>> i) How do I check if the DMA access is properly configured? What kind of
>> values am I expecting?
>> ii) If the values aren't the expected, what are the steps to make sure I
>> take full advantage of the hardware?
>>
>> I'm using a Toshiba Satellite 2450-101 laptop.
>>
>> Thank you in advance,
>> Tiago Maduro Dias
>>
>> --
>>
>> "To underestimate one's self is as much a departure from truth as to
>> exaggerate one's own powers."
>> (Sherlock Holmes)
>>
>>
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