I get dma timeouts with kernel 2.3.99-pre6. I noticed this when I was copying 20GB data from one disk to another.
I have four disks hda,hdc on on board ide controller (440fx)and hde,hdg on a promise ultra66.
I copy data from hdg to hde and its was more or less the only thing. The kswapd problem is also very visible with over 90% cpu when DMA is on, when DMA is dead it's not showing.
After some time I got dma timeout on hda ?? and that one is not even involved in the copying.
>May 5 01:18:06 ken1 kernel: hda: timeout waiting for DMA
>May 5 01:18:07 ken1 kernel: ide_dmaproc: chipset supported ide_dma_timeout func only: 14
>May 5 01:18:07 ken1 kernel: hda: irq timeout: status=0x58 { DriveReady SeekComplete DataRequest }
followed by hdc and that one should not have any access at all going to it.
>May 5 01:24:05 ken1 kernel: hdc: timeout waiting for DMA
>May 5 01:24:05 ken1 kernel: ide_dmaproc: chipset supported ide_dma_timeout func only: 14
>May 5 01:24:05 ken1 kernel: hdc: irq timeout: status=0x58 { DriveReady SeekComplete DataRequest }
Then both channels on the promise card dives more or less the same time.
>May 5 01:51:29 ken1 kernel: hdg: timeout waiting for DMA
>May 5 01:51:29 ken1 kernel: ide_dmaproc: chipset supported ide_dma_timeout func only: 14
>May 5 01:51:29 ken1 kernel: hdg: irq timeout: status=0x58 { DriveReady SeekComplete DataRequest }
>May 5 01:51:29 ken1 kernel: hde: timeout waiting for DMA
>May 5 01:51:29 ken1 kernel: ide_dmaproc: chipset supported ide_dma_timeout func only: 14
>May 5 01:51:29 ken1 kernel: hde: irq timeout: status=0x58 { DriveReady SeekComplete DataRequest }
I also get very bad values from hdparm -t on the promise card 7MB and 12MB. The one that gives 7MB on another computer gave 24MB. As both the CPU and IDE controller changed I really dont know if its a
problem with promise code or if the CPU is to slow(ppro 200MHz no overclocking of any kind).
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