[ltp] hdparm settings?

[Eric Van Buggenhaut]

On Fri, Feb 18, 2005 at 10:47:57AM -0500, Charles E Taylor IV wrote:
> On Fri, 18 Feb 2005 16:32:30 +0100
> Eric Van Buggenhaut <eric@sindominio.net> wrote:
> 
> > That's pretty nice: with a 60GB disk at 7200RPM on my T42 I only get:
> > 
> > atto:/home/eric[0]# hdparm -t /dev/hda
> > 
> > /dev/hda:
> >  Timing buffered disk reads:   38 MB in  3.02 seconds =  12.58 MB/sec
> > atto:/home/eric[0]# hdparm  /dev/hda
> > 
> > /dev/hda:
> >  multcount    =  0 (off)
> >  IO_support   =  1 (32-bit)
> >  unmaskirq    =  0 (off)
> >  using_dma    =  1 (on)
> >  keepsettings =  0 (off)
> >  readonly     =  0 (off)
> >  readahead    = 256 (on)
> >  geometry     = 65535/16/63, sectors = 60011642880, start = 0
> 
> Okay, that's REALLY slow ... for a 7200 RPM drive on a T42?  My 40GB 5400
> RPM drive is set up this way:
> 
> # hdparm /dev/hda
> 
> /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)
>  geometry     = 16383/255/63, sectors = 40007761920, start = 0
> 
> and gives this performance:
> 
> # hdparm -t /dev/hda
> 
> /dev/hda:
>  Timing buffered disk reads:  104 MB in  3.02 seconds =  34.41 MB/sec
> 
> Is your measurement taken when the system is quiet, or is updatedb running
> in the background or something? :)
> 

I applied your tweaks and it got better but still don't reach your own 
figures:

atto:/home/eric[0]# hdparm -tT /dev/hda

/dev/hda:
 Timing cached reads:   884 MB in  2.09 seconds = 422.42 MB/sec
 Timing buffered disk reads:   92 MB in  3.22 seconds =  28.57 MB/sec

-- 
Eric VAN BUGGENHAUT
Eric.VanBuggenhaut@AdValvas.be