Hi Jeff, On Don, 2011-09-01 at 10:19 -0400, Jeff Moyer wrote: > Werner Fischer <devlists@xxxxxxxx> writes: > > http://www.thomas-krenn.com/de/wikiDE/images/0/07/Linux-IO-Stack.png > > Is this diagram correct or are there any errors in there? > > That's a nice diagram. :) Thanks! ;-) > A few of things of note: > 1) O_DIRECT I/O can bypass the page cache you are right, I'll add it. > 2) request-based dm targets sit below the I/O scheduler (currently, that > just means dm-multipath) Thanks, I'll correct this. > 3) the fusion IO device driver can hook itself in where you put it, or > also up above the I/O scheduler (based on a module load option). Oh wow, that sounds interesting. Does this mean that in this case (IO device driver above the I/O scheduler) simply no I/O scheduler is used? > 4) not sure if you want to cover I/O directly to the device (no file > system involved) Yea, that sound reasonable. I'll add it. So thanks a lot for your valuable feedback. I will update the diagram according to your hints and let you know then. Once the diagram is in a state that seems reasonable, I'll add it to Wikipedia commons under some open license and include it in articles where it makes sense (e.g. http://en.wikipedia.org/wiki/Deadline_scheduler and so on) Regards, Werner -- To unsubscribe from this list: send the line "unsubscribe fio" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
