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Message-ID: <49EB1A33.7050808@rtr.ca> Date: Sun, 19 Apr 2009 08:33:55 -0400 From: Mark Lord <lkml@....ca> To: Rogério Brito <rbrito@....usp.br> Cc: linux-kernel@...r.kernel.org Subject: Re: Quick question about libata and hdparm Rogério Brito wrote: > 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: .. > Am I doing something incorrectly? I would like at least to understand > what is happening and, if possible, to fine-tune some settings. .. Nearly all of the hdparm flags work fine with libata and SATA/PATA drives. Among the *very few* that do not, are the -m and -d flags. -c will be working in the newest kernels, but not yet in most distro kernels. The -d flag is not permitted by libata, as the kernel prefers to completely dictate DMA / PIO, and it does do a rather good job of it. The -m flag could be done, and I even have code in hdparm to do it, but libata is very buggy with multi-sector I/O, so -m is currently is disallowed. Cheers -- 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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