Messages in this thread | | | Subject | Re: Checking module parameters | Date | Mon, 19 Jan 2009 09:38:07 +0000 | From | (Nick Craig-Wood) |
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David Wagner <daw@cs.berkeley.edu> wrote: > Is there a way to tell what options have been applied to a currently > loaded kernel module? > > I'm trying to force libata to use 1.5Gbps rather than 3Gbps, so I created > a file /etc/modprobe.d/local containing: > options libata force=1.5Gbps > However my SATA drive gets loaded at 3Gbps. I'm trying to figure out how > to debug this so that I can tell whether the option got correctly applied > to the libata module, and if not, how to force the SATA link to 1.5Gbps. > Any suggestions or ideas? > > (I can't set libata.force=1.5Gbps as a kernel argument because on my > Fedora kernel, libata is loaded as a module rather than built into the > kernel. I can't run "modprobe libata force=1.5Gbps" by hand because > I've got SATA drives, so the libata module is automatically loaded before > I get shell access.)
I had to do this recently (under debian I ended up putting "libata force=1.5Gbps" into /etc/modules)
You can check it is working by looking for something like this in the log
[ 2.345058] ata1: FORCE: PHY spd limit set to 1.5Gbps [ 2.345058] ata1: SATA max UDMA/133 abar m2048@0xfb106000 port 0xfb106100 irq 218 [ 2.345058] ata2: FORCE: PHY spd limit set to 1.5Gbps [ 2.345058] ata2: SATA max UDMA/133 abar m2048@0xfb106000 port 0xfb106180 irq 218 [ 2.345058] ata3: FORCE: PHY spd limit set to 1.5Gbps [ 2.345058] ata3: SATA max UDMA/133 abar m2048@0xfb106000 port 0xfb106200 irq 218 [ 2.345058] ata4: FORCE: PHY spd limit set to 1.5Gbps [ 2.345058] ata4: SATA max UDMA/133 abar m2048@0xfb106000 port 0xfb106280 irq 218 [ 2.345058] ata5: FORCE: PHY spd limit set to 1.5Gbps [ 2.345058] ata5: SATA max UDMA/133 abar m2048@0xfb106000 port 0xfb106300 irq 218 [ 2.345058] ata6: FORCE: PHY spd limit set to 1.5Gbps [ 2.345058] ata6: SATA max UDMA/133 abar m2048@0xfb106000 port 0xfb106380 irq 218
-- Nick Craig-Wood <nick@craig-wood.com> -- http://www.craig-wood.com/nick
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