[vdr] Re: VDR recording problem

[Ryan Mak <ryanmak@ameritech.net>]

# hdparm /dev/hdc1

/dev/hdc1:
 multcount    = 16 (on)
 IO_support   =  0 (default 16-bit)
 unmaskirq    =  0 (off)
 using_dma    =  1 (on)
 keepsettings =  0 (off)
 readonly     =  0 (off)
 readahead    =  8 (on)
 geometry     = 14593/255/63, sectors = 167766732,
start = 63


--- Sergei Haller <Sergei.Haller@math.uni-giessen.de>
wrote:

> On Mon, 17 Jan 2005, Richard Scobie (RS) wrote:
> 
> RS> 
> RS> > > > UDMA modes: udma0 udma1 udma2 udma3 *udma4
> udma5
> RS> 
> RS> And indeed the asterisked entry shows the drive
> is using UDMA66.
> 
> this is not an indicator for dma being enabled, as
> the following example 
> shows:
> 
>    # sudo hdparm -d0 /dev/hda
> 
>    /dev/hda:
>     setting using_dma to 0 (off)
>     using_dma    =  0 (off)
> 
>    # hdparm /dev/hda
> 
>    /dev/hda:
>     multcount    = 16 (on)
>     IO_support   =  0 (default 16-bit)
>     unmaskirq    =  0 (off)
>     using_dma    =  0 (off)
>     keepsettings =  0 (off)
>     readonly     =  0 (off)
>     readahead    = 256 (on)
>     geometry     = 16383/255/63, sectors = 78140160,
> start = 0
> 
>    # hdparm -i /dev/hda
> 
>    /dev/hda:
> 
>     Model=ST94811A, FwRev=3.04, SerialNo=3KW0DP0K
>     Config={ HardSect NotMFM HdSw>15uSec Fixed
> DTR>10Mbs RotSpdTol>.5% }
>     RawCHS=16383/16/63, TrkSize=0, SectSize=0,
> ECCbytes=4
>     BuffType=unknown, BuffSize=8192kB,
> MaxMultSect=16, MultSect=16
>     CurCHS=16383/16/63, CurSects=16514064, LBA=yes,
> LBAsects=78140160
>     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: unknown setting
> WriteCache=enabled
>     Drive conforms to: ATA/ATAPI-6 T13 1410D
> revision 2:
> 
>     * signifies the current active mode
> 
> as you can see, dma is disabled "using_dma = 0
> (off)" 
> but the asterisk is at "udma5"
> 
> and here is the timing difference:
> 
>    # sudo hdparm -t /dev/hda
> 
>    /dev/hda:
>     Timing buffered disk reads:    8 MB in  3.10
> seconds =   2.58 MB/sec
> 
>    # sudo hdparm -d1 /dev/hda
> 
>    /dev/hda:
>     setting using_dma to 1 (on)
>     using_dma    =  1 (on)
> 
>    # sudo hdparm -t /dev/hda
> 
>    /dev/hda:
>     Timing buffered disk reads:   94 MB in  3.05
> seconds =  30.81 MB/sec
> 
> 
> hope, that helps
> 
> 
> 
> c ya
>         Sergei
> -- 
>
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>  -?)
>          eMail:      
> Sergei.Haller@math.uni-giessen.de               /\\
>
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> _\_V
> Be careful of reading health books, you might die of
> a misprint.
>                 -- Mark Twain
> 
> 
>