Messages in this thread | | | From | Dan Yocum <> | Subject | IDE DMA getting turned off... | Date | Tue, 26 Oct 1999 09:45:42 -0500 |
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Andre, Andries, Mark,
Well, we've run into a brand new IDE problem: disk DMA is getting turned off mysteriously. Here's one way to reproduce the problem: do a 'hdparm -S 1 /dev/hdX', wait about a minute then try to write to the disk. The write speed is about 3MB/s (ouch!) and this is the error message:
hdc: timeout waiting for DMA hdc: irq timeout: status=0xd2 { Busy } hdc: DMA disabled hdd: DMA disabled Oct 24 08:09:30 fnpc229 kernel: hdc: timeout waiting for DMA Oct 24 08:09:30 fnpc229 kernel: hdc: irq timeout: status=0xd2 { Busy } Oct 24 08:09:30 fnpc229 kernel: hdc: DMA disabled Oct 24 08:09:30 fnpc229 kernel: hdd: DMA disabled ide1: reset: success Oct 24 08:09:31 fnpc229 kernel: ide1: reset: success
Looking at the status of said drive 'hdparm -C /dev/hdX' shows the the DMA to be turned off and running bonnie proves it - the performance is horrible.
So, we set the standby mode to off (i.e., 'hdparm -S 0' and it never spins the drive down) and try to write to the disk - at some point in the future after turning DMA on, DMA gets turned off for no obvious reason.
This is a big deal to us since we require the read/write speed to exceed 6MB/sec (and of course it would be nice if it was in the 14-15MB/s range).
Any ideas?
Here's the specifics of the 2 drives we're using. The WD disks are on an Intel Lancewood MB, the Maxtor's are on an ASUS P2BD:
/dev/hdc:
Model=Maxtor 91700U5, FwRev=MA540RR0, SerialNo=C5H00JXC Config={ Fixed } RawCHS=32972/16/63, TrkSize=0, SectSize=0, ECCbytes=57 BuffType=3(DualPortCache), BuffSize=2048kB, MaxMultSect=16, MultSect=off DblWordIO=no, maxPIO=2(fast), DMA=yes, maxDMA=0(slow) CurCHS=32972/16/63, CurSects=33235776, LBA=yes, LBAsects=33235776 tDMA={min:120,rec:120}, DMA modes: mword0 mword1 mword2 IORDY=on/off, tPIO={min:120,w/IORDY:120}, PIO modes: mode3 mode4
/dev/hdc:
Model=WDC AC418000D, FwRev=J78OA30K, SerialNo=WD-WT669 Config={ HardSect NotMFM HdSw>15uSec Fixed DTR>10Mbs } RawCHS=34960/16/63, TrkSize=0, SectSize=0, ECCbytes=34 BuffType=3(DualPortCache), BuffSize=1966kB, MaxMultSect=16, MultSect=off DblWordIO=no, maxPIO=2(fast), DMA=yes, maxDMA=2(fast) CurCHS=34960/16/63, CurSects=35239680, LBA=yes, LBAsects=35239680 tDMA={min:120,rec:120}, DMA modes: mword0 mword1 mword2 IORDY=on/off, tPIO={min:240,w/IORDY:120}, PIO modes: mode3 mode4
Thanks, in advance, for the help.
Dan
___________________________________________________________________________ Dan Yocum | Phone: (630) 840-8525 Linux Research and Development | Fax: (630) 840-6345 Computing Division, OSS Dept. | email: yocum@fnal.gov .~. L Fermi National Accelerator Lab | WWW: www-oss.fnal.gov/~yocum/ /V\ I P.O. Box 500 | // \\ N Batavia, IL 60510 | "TANSTAAFL" /( )\ U ________________________________|_________________________________ ^`~'^__X_
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