[wplug] DMA

Henry Umansky hmust2 at pitt.edu
Tue Mar 11 22:58:46 EST 2003


When I ran lsmod, ide-scsi is not loaded and when I ran hdparm with the 
-i option I get the following:

[root at localhost root]# hdparm -i /dev/hdd

/dev/hdd:

 Model=TOSHIBA DVD-ROM SD-M1502, FwRev=1008, SerialNo=1100306493
 Config={ Fixed Removeable DTR<=5Mbs DTR>10Mbs nonMagnetic }
 RawCHS=0/0/0, TrkSize=0, SectSize=0, ECCbytes=0
 BuffType=unknown, BuffSize=128kB, MaxMultSect=0
 (maybe): CurCHS=0/0/0, CurSects=0, LBA=yes, LBAsects=0
 IORDY=on/off, tPIO={min:120,w/IORDY:120}, tDMA={min:120,rec:120}
 PIO modes:  pio0 pio1 pio2 pio3 pio4
 DMA modes:  sdma0 sdma1 sdma2 mdma0 mdma1 mdma2
 UDMA modes: udma0 udma1 udma2
 AdvancedPM=no
 Drive conforms to: ATA/ATAPI-5 T13 1321D revision 3:  2 3 4 5

I'm not a hardware guy, so I can't really tell if this drive supports DMA.

-Henry

Alexandros Papadopoulos wrote:

>-----BEGIN PGP SIGNED MESSAGE-----
>Hash: SHA1
>
>On Tuesday 11 March 2003 18:25, Henry Umansky wrote:
>  
>
>>I believe it supports it, because the following works:
>>
>>[root at localhost linux-2.4]# hdparm -d1 /dev/hda
>>
>>/dev/hda:
>> setting using_dma to 1 (on)
>> using_dma    =  1 (on)
>>
>>I'm not sure exactly how to check if its being emulated as a SCSI
>>drive. 
>>    
>>
>
>Grab the list of loaded modules with
># lsmod
>
>and look for ide-scsi or something similar.
>
>To check what your drive supports, you can try other hdparm switches, 
>like hdparm -i /dev/hdd
>
>- -A
>- -- 
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