Messages in this thread | | | Date | Tue, 26 Nov 2002 14:05:38 +0100 | From | Tomas Szepe <> | Subject | Re: Identifying/activating faster ATAxx modes (WAS kernel config tale of woe) |
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> > > > > /dev/hda: > > > > > > > > > > Model=Maxtor 6E030L0, FwRev=NAR61590, SerialNo=E106SZLE > > > > > Config={ Fixed } > > > > > RawCHS=16383/16/63, TrkSize=0, SectSize=0, ECCbytes=57 > > > > > BuffType=DualPortCache, BuffSize=2048kB, MaxMultSect=16, MultSect=16 > > > > > CurCHS=16383/16/63, CurSects=16514064, LBA=yes, LBAsects=60058656 > > > > > IORDY=on/off, tPIO={min:120,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 *udma6 > > > >... > > > > This is weird. Your disk seems to be set up for udma6 (UATA133), > > > > which should provide for transfer rates of at least 40MiB/s. > > > >... > > > > > > The information in "hdparm -i" shows the identification info of the > > > drive. It doesn't show whether DMA is actually used (you need > > > "hdparm -v" for this)... > > > > While this is true, I fail to see why the -i output would report > > udma6 as being the current transfer mode instead of a pio one if > > DMA were disabled. > > These were my thoughts until someone told me some time ago that this is > wrong... > > 1. "man hdparm" says: "-i Display the identification info that > was obtained from the drive at _boot time_", it doesn't give > information about the current state of the drive. > > 2. Try to disable DMA using "hdparm -d0" (you can check it with > "hdparm -v") - the information displayed by "hdparm -i" won't > change.
Hmm, I wasn't aware of this. The manpage confirms what you're saying and adds that the information may or may not be reflecting the current state.
However, Dennis's -I output also shows udma6 as the mode the drive is in, and -I info -- according to the manual -- is obtained "directly from the drive," which I read as "let's ask the drive what it's set up like at this moment."
Dennis, could you possibly post the "hdparm -v" output too?
-- Tomas Szepe <szepe@pinerecords.com> - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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