[mythtv-users] How much horespower for frontend?

[Jason]

Ahh,  DMA looks to be the issue.   You dont seemt to have your IDE
chipset compiled into the kernel so it can't set the "use dma" features.
Without DMA, a box will be so sluggish as to almost be unusable when you
really start to hit the disk and will be just unacceptable the remainder
of the time. Do an lspci to get your chipset, then compile that support
into your kernel. That should help yuo a LOT.

--
Jason
The place where you made your stand never mattered,
only that you were there... and still on your feet



James Pifer wrote:
> On Tue, 2006-09-26 at 12:56 -0500, Jason wrote:
>   
>> Im not sure you have DMA enabled on your drives, which could cause you
>> all sorts of woes.  For example, my timed cached reads on a 1.6ghz
>> machine are 1065 MB/sec.   Let your box settle down a bit and then run
>>
>> hdparm -d1 /dev/hdaWhatever
>>
>> then run that hdparm -tT again 
>>
>>     
>
>
> I got this:
> [root at mythtv ~]# hdparm -d1 /dev/hda1
>
> /dev/hda1:
>  setting using_dma to 1 (on)
>  HDIO_SET_DMA failed: Invalid argument
>  using_dma    =  1 (on)
> [root at mythtv ~]# hdparm -tT /dev/hda1
>
> /dev/hda1:
>  Timing cached reads:   608 MB in  2.00 seconds = 303.62 MB/sec
>  Timing buffered disk reads:  118 MB in  3.01 seconds =  39.16 MB/sec
> [root at mythtv ~]#
> [root at mythtv ~]# hdparm -d1 /dev/hdd1
>
> /dev/hdd1:
>  setting using_dma to 1 (on)
>  HDIO_SET_DMA failed: Invalid argument
>  using_dma    =  1 (on)
> [root at mythtv ~]# hdparm -tT /dev/hdd1
>
> /dev/hdd1:
>  Timing cached reads:   596 MB in  2.00 seconds = 298.07 MB/sec
>  Timing buffered disk reads:   70 MB in  3.02 seconds =  23.19 MB/sec
> [root at mythtv ~]#
>
> Can test whether it affected anything with playback yet. 
>
> James
>
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