On Mon, Jan 10, 2011 at 02:25:47PM +0100, Michael Monnerie wrote: > On Montag, 10. Januar 2011 Dave Chinner wrote: > > Pretty much > > every sata disk supports NCQ these days, and default to a depth of > > 32, which means we can have 32 concurrent reads in progress at once. > > Phase 2 is all synchronous IO, so the only way to hide the IO > > latency is to queue work to multiple threads and switch between the > > threadsto work on another queue when the current one blocks waiting > > for IO. > > This is interesting. Did you measure this with a rotating single disk? Take a look at the patch description. _______________________________________________ xfs mailing list xfs@xxxxxxxxxxx http://oss.sgi.com/mailman/listinfo/xfs
