Messages in this thread Patch in this message | | | Date | Wed, 15 Mar 2006 23:11:19 +0100 | From | Ingo Molnar <> | Subject | Re: libata/sata_nv latency on NVIDIA CK804 [was Re: AMD64 X2 lost ticks on PM timer] |
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the patch below is a blind shot into the dark: it turns on MMIO for the sata_nv driver. But be careful with it - this turns on a probably totally untested mode in the driver and thus may damage your data. (It might not even work at all because the driver might not be ready for it - Jeff?). I'd suggest to first boot into single-user mode with all filesystems readonly mounted.
on the low chance of this patch actually working, the interesting thing would be to check whether the latencies occur in MMIO mode too? (if they do then please send us the new latency traces too.)
Ingo
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WARNING: this may damage your data. Be careful ...
drivers/scsi/sata_nv.c | 1 + 1 files changed, 1 insertion(+)
Index: linux/drivers/scsi/sata_nv.c =================================================================== --- linux.orig/drivers/scsi/sata_nv.c +++ linux/drivers/scsi/sata_nv.c @@ -280,6 +280,7 @@ static struct ata_port_info nv_port_info .host_flags = ATA_FLAG_SATA | /* ATA_FLAG_SATA_RESET | */ ATA_FLAG_SRST | + ATA_FLAG_MMIO | ATA_FLAG_NO_LEGACY, .pio_mask = NV_PIO_MASK, .mwdma_mask = NV_MWDMA_MASK, - 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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