Messages in this thread | | | Date | Fri, 20 Oct 2000 16:36:35 -0600 | From | "Jeff V. Merkey" <> | Subject | Re: DMA and my Maxtor drive |
| |
Linux 2.X trees are tested with memory sent from the buffer cache to the disk I/O subsystem aligned on 512-byte boundries. This error is typically seen is someone is passing memory via calls to ll_rw_blk() that are not at a minimum 512-byte aligned, which can result in a wrap case that will hang the IDE DMA controller. Linux I do not believe has been tested with any other alignment. When I first saw these errors when I was writing my own LRU for the NWFS file system, alignment was the cause.
:-)
Jeff
linux@cr753963-a.glph1.on.wave.home.com wrote: > > I get this when DMA is enabled: > > Oct 20 15:39:07 cr753963-a kernel: hdb: timeout waiting for DMA > Oct 20 15:39:07 cr753963-a kernel: hdb: irq timeout: status=0x6e { > DriveReady DeviceFault DataRequest CorrectedError Index } > ide0: reset: success > Oct 20 15:39:07 cr753963-a kernel: hdb: DMA disabled > Oct 20 15:39:07 cr753963-a kernel: ide0: reset: success > > It only happens when there lots of data is being transferred, or compiled > on the drive.. The drive status is this: > > /dev/hdb: > > Model=Maxtor 82560A4, FwRev=AA8Z2726, SerialNo=C40LTQGA > Config={ Fixed } > RawCHS=4962/16/63, TrkSize=0, SectSize=0, ECCbytes=20 > BuffType=DualPortCache, BuffSize=256kB, MaxMultSect=16, MultSect=off > CurCHS=4962/16/63, CurSects=5001696, LBA=yes, LBAsects=5001728 > 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 > > - > To unsubscribe from this list: send the line "unsubscribe linux-kernel" in > the body of a message to majordomo@vger.kernel.org > Please read the FAQ at http://www.tux.org/lkml/ - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org Please read the FAQ at http://www.tux.org/lkml/
| |