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Date: Sat, 18 Apr 2009 21:22:11 -0300 From: Rogério Brito <rbrito@....usp.br> To: linux-kernel@...r.kernel.org Subject: Quick question about libata and hdparm Dear people, I have one small question regarding the libata drivers and the interaction with hdparm. I am presently using PATA/IDE devices only, but some distributions provide kernels with libata by default (and some defconfigs also use libata even for IDE devices). Using the usual IDE drivers, I can use/query various parameters with hdparm, like, for instance, the -m option, the -c option or even disabling DMA. With the libata drivers, this is all that I get: - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - lutz:~# hdparm /dev/sda /dev/sda: IO_support = 0 (default) readonly = 0 (off) readahead = 256 (on) geometry = 48641/255/63, sectors = 781420655, start = 0 lutz:~# hdparm -c 1 /dev/sda /dev/sda: setting 32-bit IO_support flag to 1 HDIO_SET_32BIT failed: Invalid argument IO_support = 0 (default) lutz:~# hdparm -m 16 /dev/sda /dev/sda: setting multcount to 16 HDIO_SET_MULTCOUNT failed: Inappropriate ioctl for device HDIO_GET_MULTCOUNT failed: Inappropriate ioctl for device lutz:~# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Am I doing something incorrectly? I would like at least to understand what is happening and, if possible, to fine-tune some settings. If necessary, please let me know and I will provide any further information that may be needed. Thanks in advance, Rogério Brito. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.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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