Messages in this thread | | | From | Bartlomiej Zolnierkiewicz <> | Subject | Re: bugme #1217: "Use PCI DMA by default when available" does not work | Date | Sat, 22 Nov 2003 23:20:18 +0100 |
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Chris, please post output of 'lspci -vvv -xxx' - it will be very useful. We can see what registers are programmed differently when autodma is off.
--bart
On Saturday 22 of November 2003 21:48, Chris Cheney wrote: > I sent the following followup report to the bug I filed at > bugme.osdl.org several months ago about my hpt372 ide controller being > slow. > > I have determined what causes the dramatic slowdown problem. It is not > drive specific but it may be specific to the hpt controllers. The > problem is due to using automatic dma. If I don't have the following > two options set in my kernel then it runs at full speed when I turn on > dma with hdparm. Otherwise using automatic dma I get somewhere between > a 50% - 700% slowdown on writes, reads seem to not be as badly affected. > This is reproducible on both 2.4.23-rc1-xfs and 2.6.0-test9-bk24 (the > two I tested on). > > CONFIG_IDEDMA_PCI_AUTO=3Dy=20 > CONFIG_IDEDMA_AUTO=3Dy=20
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