[mythtv-users] LiveTV with via M-9000 board

[Barry Davis]

I doubt its down to the drivers - its probably more likley the need for 
different hdparm options.
Have a look at the settings for 32/16bit mode access and the udma settings.

Tos display your settings:
    hdparm -cd /dev/hda

To change the settings:
    hdparm -c 1 /dev/hda        # 32bit mode
    hdparm -c 0 /dev/hda        # 16bit mode
    hdparm -d 1 /dev/hda        # udma off
    hdparm -d 0 /dev/hda        # udma on

I'm running 2.4.18 suse8.0.
Heres the results from my disk with the 4 possible combinations:

---------------------------
 > hdparm -cd /dev/hda
/dev/hda:
 I/O support  =  0 (default 16-bit)
 using_dma    =  0 (off)

 > hdparm -tT /dev/hda
/dev/hda:
 Timing buffer-cache reads:   128 MB in  0.23 seconds =556.52 MB/sec
 Timing buffered disk reads:  64 MB in 19.64 seconds =  3.26 MB/sec
----------------------------
 > hdparm -cd /dev/hda
/dev/hda:
 I/O support  =  1 (32-bit)
 using_dma    =  0 (off)

 > hdparm -tT /dev/hda
/dev/hda:
 Timing buffer-cache reads:   128 MB in  0.23 seconds =556.52 MB/sec
 Timing buffered disk reads:  64 MB in 10.52 seconds =  6.08 MB/sec
-------------------------------
 > hdparm -cd /dev/hda
/dev/hda:
 I/O support  =  0 (default 16-bit)
 using_dma    =  1 (on)

 > hdparm -tT /dev/hda
/dev/hda:
 Timing buffer-cache reads:   128 MB in  0.23 seconds =556.52 MB/sec
 Timing buffered disk reads:  64 MB in  2.63 seconds = 24.33 MB/sec
---------------
 > hdparm -cd /dev/hda
/dev/hda:
 I/O support  =  1 (32-bit)
 using_dma    =  1 (on)

 > hdparm -tT /dev/hda
/dev/hda:
 Timing buffer-cache reads:   128 MB in  0.23 seconds =556.52 MB/sec
 Timing buffered disk reads:  64 MB in  2.49 seconds = 25.70 MB/sec
-----------------------------

My cached reads might be a bit higher than yours because I'm running on 
a p4xeon workstation.

If you can get better results by playing with these options then try 
mythtv again. You could always try using a ramdisk for storage as well, 
just to make sure its not the disk thats the problem. Most people have 
been saying you only need 0.5MB/s access speed.


Peter wrote:

>this are the test with the 2.4.18 kernel (Debian)
>
>Timing buffered disk reads:  64 MB in 10.89 seconds =  5.88 MB/sec
>Timing buffer-cache reads:   128 MB in  1.71 seconds = 74.85 MB/sec
>
>I have loaded the 2.4.20 Kernel, there the MB/sec 3times faster... but i
>think this would be better when i get running the 2.5dev Kernel.(it compiles
>perfect, but when i start it displays nothing, but i thing the kernel
>started, because of fsck checks next boot time) On the Via site they sad
>that there is a bug in the IDE driver and all seems to be fixed in the 2.5
>Kernel.
>
>----- Original Message ----- 
>From: "Barry Davis" <bdavis at elipsan.com>
>To: "Discussion about mythtv" <mythtv-users at snowman.net>
>Sent: Friday, May 23, 2003 9:57 AM
>Subject: Re: [mythtv-users] LiveTV with via M-9000 board
>
>
>  
>
>>Try this to see how fast your drive is:
>>
>>root > hdparm -t /dev/hda
>>
>>/dev/hda:
>> Timing buffered disk reads:  64 MB in  3.59 seconds = 17.83 MB/sec
>>root > hdparm -T /dev/hda
>>
>>/dev/hda:
>> Timing buffer-cache reads:   128 MB in  0.23 seconds =556.52 MB/sec
>>
>>
>>Peter wrote:
>>
>>    
>>
>>>Is anyone running smooth LiveTV on the via M-9000 board?
>>>
>>>My board seems to be to slow... or the HD is to slow. I have read that
>>>      
>>>
>there
>  
>
>>>is a kernel Patch for speed up IDE things, but i can't see any
>>>improvements...
>>>
>>>Suggestions what i can do?
>>>
>>>Thanks Peter
>>>
>>>_______________________________________________
>>>mythtv-users mailing list
>>>mythtv-users at snowman.net
>>>http://lists.snowman.net/cgi-bin/mailman/listinfo/mythtv-users
>>>
>>>
>>>
>>>      
>>>
>>_______________________________________________
>>mythtv-users mailing list
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>>
>>    
>>
>
>_______________________________________________
>mythtv-users mailing list
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>  
>

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