Peter Grandi <pg_lxra <at> lxra.for.sabi.co.UK> writes: > this seems to indicate that not only the Linux block IO subsystems issues > IO operations in multiples of the read-ahead size, but does so at a fixed > number of times per second that is a multiple of 10. Is it the case with a classic controller (not a 3ware?) http://forums.storagereview.net/index.php?showtopic=25923 may be of interest. > Which lead me to think about elevators, which was also mentioned > in some recent (and otherwise less interesting :->) Sorry, I don't understand this. > It still seems the case to me that the block IO subsystem > structures IO in lots of read-ahead sectors Isn't it specific to the 3ware driver and/or hardware, even in SINGLE (JBOD) mode? > Finally, I am getting a bit skeptical about elevators in general; > several tests show no-elevator as not being significantly worse > and sometimes better than any elevator Isn't it specific to intelligent controllers? -- 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
