[ltp] hdparm settings?

[Justin Mason]

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Charles E Taylor IV writes:
> On Fri, 18 Feb 2005 12:54:56 -0700
> Nathan Kurz <nate@verse.com> wrote:
> 
> > Interesting.  On my X30 with a 40G drive (presumed 5400 RPM), I still
> > get a consistent 18 MB/s, and can't get the 34 MB/s you are seeing.
> > Playing with it a little bit, I see that adjusting multcount (-m) from
> > 0 to 16 does not seem to affect the transfer speed, and that
> > surprisingly adjusting 32-bit IO Support (-c) from off to on also has
> > no effect.  I had been playing with readahead set very large (set with
> > 'blockdev'), but lowering it also seemed to have no effect.
> 
> You'd think it would be 5400 RPM.  My machine is an X22.  I'm not sure how
> different the X30 is from the X22, but you'd think they would put FASTER
> drives in them - or at least equivalent drives.
> 
> > On desktop machines I've occasionally seen the speed double when
> > adding 32-bit support, and since your speed is just about double mine
> > that seems suspicious.  Anyone know if this setup should support
> > 32-bit IO and have any idea why it might not be?
> 
> I tried turning off 32-bit IO support on my drive, and the speed
> effectively remains the same.  33-35 MB/s.
> 
> Maybe part of the speed difference is a difference in kernels?  I'm
> running Fedora Core 3 with a 2.6.9 series kernel (haven't upgraded to the
> latest Fedora Core 3 kernel because of some unresolved suspend/sound/USB
> issues with the latest FC3 kernel).
> 
> For reference, the info from the drive in my X22 looks like this:
> 
> # hdparm -i /dev/hda
> 
> /dev/hda:
> 
>  Model=HTS548040M9AT00, FwRev=MG2OA50A, SerialNo=MRL230L2G0J72B
>  Config={ HardSect NotMFM HdSw>15uSec Fixed DTR>10Mbs }
>  RawCHS=16383/16/63, TrkSize=0, SectSize=0, ECCbytes=4
>  BuffType=DualPortCache, BuffSizex77kB, MaxMultSect=16, MultSect=16
>  CurCHS=16383/16/63, CurSects=16514064, LBA=yes, LBAsectsx140160
>  IORDY=on/off, tPIO={min:240,w/IORDY:120}, tDMA={min:120,rec:120}
>  PIO modes:  pio0 pio1 pio2 pio3 pio4 
>  DMA modes:  mdma0 mdma1 mdma2 
>  UDMA modes: udma0 udma1 udma2 udma3 udma4 *udma5 
>  AdvancedPM=yes: mode=0x80 (128) WriteCache=enabled
>  Drive conforms to: ATA/ATAPI-6 T13 1410D revision 3a: 

It may be the model of drive.  Mine is also an IC25N, like Nathan's, and I
get a max of about 25 MB/s from hdparm -t.

: jm 130...; sudo hdparm -i /dev/hda
Password:

/dev/hda:

 Model=IC25N080ATMR04-0, FwRev=MO4OAD4A, SerialNo=MRG405K4GXZ8PH
 Config={ HardSect NotMFM HdSw>15uSec Fixed DTR>10Mbs }
 RawCHS=16383/16/63, TrkSize=0, SectSize=0, ECCbytes=4
 BuffType=DualPortCache, BuffSize=7884kB, MaxMultSect=16, MultSect=16
 CurCHS=16383/16/63, CurSects=16514064, LBA=yes, LBAsects=156301488
 IORDY=on/off, tPIO={min:240,w/IORDY:120}, tDMA={min:120,rec:120}
 PIO modes:  pio0 pio1 pio2 pio3 pio4
 DMA modes:  mdma0 mdma1 mdma2
 UDMA modes: udma0 udma1 udma2 udma3 udma4 *udma5
 AdvancedPM=yes: mode=0x80 (128) WriteCache=enabled
 Drive conforms to: ATA/ATAPI-6 T13 1410D revision 3a:

 * signifies the current active mode

: jm 131...; sudo hdparm -v /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     = 65535/16/63, sectors = 80026361856, start = 0
: jm 132...; sudo hdparm -t /dev/hda

/dev/hda:
 Timing buffered disk reads:   78 MB in  3.04 seconds =  25.62 MB/sec
: jm 133...; sudo hdparm -t /dev/hda

/dev/hda:
 Timing buffered disk reads:   76 MB in  3.00 seconds =  25.31 MB/sec
: jm 134...; sudo hdparm -t /dev/hda

/dev/hda:
 Timing buffered disk reads:   76 MB in  3.03 seconds =  25.09 MB/sec

- --j.
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