[ale] boot parms ide=???

[Dow Hurst]

Geof,
In single user mode first test throughput with:

hdparm -tT /dev/hdx

do this a few times to get a decent average.

then,
hdparm /dev/hdx

will give you the current settings

after that,
hdparm -d 1 /dev/hdx

will turn on dma.

That is the simple howto hdparm.  Now, to use the -u option you'd have 
to experiment with a file system in read only mode unless you don't care 
about what is on it.  I didn't touch that as the throughput I have is 
great.  Do you want to see just how much performance you can get?

I searched Google for
high performance computing Linux IDE hdparm and got a bunch of hits.  
Here is a link with some data on hdparm but not the -u option:
http://www.networkcomputing.com/1122/1122ws2.html?ls=NCJS_1122bt

Here is a link with some info down at the bottom about hparm but isn't 
something you don't already know.
http://slashdot.org/askslashdot/01/03/07/0512206.shtml

Hope this helps a little,
Dow




Geoffrey wrote:

> I'm still trying to figure this one out.  Can't find much 
> documentation on all this.  I've since removed the boot parm reference 
> and it appears that using hdparm is sufficient to get the most bang 
> out of my drives.
>
> Cory T. Echols wrote:
>
>> On 02/19, Geoffrey wrote:
>>
>>> Interesting, I've not seen this.  I guess the kernel has not kept up 
>>> with the latest technology, since the highest available value is 66, 
>>> as noted above.
>>>
>>> Thanks.
>>
>>
>>
>> We may be talking about two different things here, but it is my
>> understanding that the clock speed specified by the "idebus" parameter
>> is not the same as the frequency that is being referred to on ide drive
>> controllers.  In other words, setting "idebus=100" is not required when
>> using a 100Mhz drive controller.  I've read the idebus parameter has
>> something to do with PIO modes, and that PIO modes aren't used if you're
>> running a 100Mhz drive controller properly.
>>
>> I know for a fact that some Promise brand ide controllers, and the
>> 100Mhz controllers on some ASUS boards are fully supported in 2.4
>> kernels.  How you configure that support, I'm not sure.  I don't own any
>> 100Mhz controllers.
>>
>>
>

-- 
__________________________________________________________
Dow Hurst                  Office: 770-499-3428
Systems Support Specialist    Fax: 770-423-6744
1000 Chastain Rd., Bldg. 12
Chemistry Department SC428  Email:dhurst at kennesaw.edu
Kennesaw State University         Dow.Hurst at mindspring.com
Kennesaw, GA 30144
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