On Fri, Feb 20, 2009 at 10:43, Sitsofe Wheeler <sitsofe@xxxxxxxxx> wrote: > Whoops, I didn't mean to send that previous half formed mail :) Sorry. > > On Thu, Feb 19, 2009 at 08:38:38AM -0500, Justin Piszcz wrote: >> >> I was curious if anyone had done any benchmarks and/or has conclusive >> information, what is the best Linux scheduler to use with SSDs? >> >> Noop? >> CFQ? >> AS? >> Deadline? > > As mentioned in another mail there was a discussion on > http://lkml.org/lkml/2009/1/31/28 and long thread talking about the > introduction of the rotational flag here > http://lkml.org/lkml/2009/1/5/340 . Cheapo SSDs or even USB keys are not > auto detected as non-rotational devices by the kernel and after a bit of > poking about I've come up with the following udev rules for my > particular cases: > > SUBSYSTEM=="block", TEST=="/sys$devpath/queue/rotational", ATTRS{model}=="ASUS-PHISON *", RUN+="/bin/sh -c 'echo 0 > /sys$devpath/queue/rotational'" Udev can write to the attribute itself. This should be all you need: SUSBSYTEM=="block", ATTRS{model}=="ASUS-PHISON *", ATTR{queue/rotational}="1" Kay -- To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
