[mythtv-users] How much horespower for frontend?

James Pifer jep at obrien-pifer.com
Tue Sep 26 19:54:09 UTC 2006


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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