On 2011-09-05 16:01, Werner Fischer wrote: > On Don, 2011-09-01 at 15:13 -0600, Jens Axboe wrote: >> [...] >> I mean that every device should plug in at the same place. There are >> definite up and down sides to plugging in at the stacking level and >> bypassing the IO scheduler. So you have to weight the pros and cons >> before doing that. We need to fix this. Drivers doing that lose out on >> other features in the name of a bit more performance, that's just not >> acceptable. > > I have updated the diagram according to all of your hints: > http://www.thomas-krenn.com/de/wikiDE/images/0/07/Linux-IO-Stack.png > > I had also some off-list discussion with Florian Haas, who convinced me > that the file systems are below of the page cache. I hope this is now > correct. Not sure I'd agree with that, I'd place the page cache between the fs and the storage layer. -- Jens Axboe -- 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
