[mythtv-users] How much horespower for frontend?

James Pifer jep at obrien-pifer.com
Wed Sep 27 14:27:57 UTC 2006


On Tue, 2006-09-26 at 19:30 -0500, Jason wrote:
> You can certainly use the other box, but I'm pretty sure something is
> going on with your IO.   For example, you are only using 16bit IO,  you
> should be using 32 bit for the most performance. Cranking on unmask IRQ
> will help to.  Give that a shot, make your settings look like the below
> and hdparm -tT again.
> 
> /dev/hda:
>  multcount    = 16 (on)
>  IO_support   =  1 (32 bit)
>  unmaskirq    =  1 (on)
>  using_dma    =  1 (on)
>  keepsettings =  0 (off)
>  readonly     =  0 (off)
>  readahead    = 256 (on)
> 
> 
> hdparm -u1 -c1 -d1 /dev/hda
> 

Doesn't seem to have changed much:

[root at mythtv ~]# hdparm -u1 -c1 -d1 /dev/hda;hdparm -u1 -c1 -d1 /dev/hdb;hdparm -u1 -c1 -d1 /dev/hdc;hdparm -u1 -c1 -d1 /dev/hdd

/dev/hda:
 setting 32-bit IO_support flag to 1
 setting unmaskirq to 1 (on)
 setting using_dma to 1 (on)
 IO_support   =  1 (32-bit)
 unmaskirq    =  1 (on)
 using_dma    =  1 (on)

/dev/hdb:
 setting 32-bit IO_support flag to 1
 setting unmaskirq to 1 (on)
 setting using_dma to 1 (on)
 IO_support   =  1 (32-bit)
 unmaskirq    =  1 (on)
 using_dma    =  1 (on)

/dev/hdc:
 setting 32-bit IO_support flag to 1
 setting unmaskirq to 1 (on)
 setting using_dma to 1 (on)
 IO_support   =  1 (32-bit)
 unmaskirq    =  1 (on)
 using_dma    =  1 (on)

/dev/hdd:
 setting 32-bit IO_support flag to 1
 setting unmaskirq to 1 (on)
 setting using_dma to 1 (on)
 IO_support   =  1 (32-bit)
 unmaskirq    =  1 (on)
 using_dma    =  1 (on)

[root at mythtv ~]# hdparm -tT /dev/hda; hdparm -tT /dev/hdb; hdparm -tT /dev/hdc; hdparm -tT /dev/hdd;

/dev/hda:
 Timing cached reads:   628 MB in  2.01 seconds = 313.07 MB/sec
 Timing buffered disk reads:  146 MB in  3.02 seconds =  48.40 MB/sec

/dev/hdb:
 Timing cached reads:   628 MB in  2.00 seconds = 313.33 MB/sec
 Timing buffered disk reads:   66 MB in  3.01 seconds =  21.91 MB/sec

/dev/hdc:
 Timing cached reads:   628 MB in  2.01 seconds = 312.64 MB/sec
 Timing buffered disk reads:   76 MB in  3.05 seconds =  24.88 MB/sec

/dev/hdd:
 Timing cached reads:   620 MB in  2.00 seconds = 309.79 MB/sec
 Timing buffered disk reads:   74 MB in  3.00 seconds =  24.66 MB/sec
[root at mythtv ~]#




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