Am 25.07.2013 02:14, schrieb Kent Overstreet: > On Tue, Jul 23, 2013 at 10:38:49PM +0200, Stefan Priebe wrote: >> Mhm works directly on block device but not with XFS on top. > > That's odd... > > Do you suppose you could look at what blktrace says is going down? If > you could compare what blktrace says is going to the bcache device with > and without XFS, hopefully that'll show what's going wrong... > > Only thing I can think of that would cause it is for some reason XFS is > sending bios down in the wrong order... which normally wouldn't be _too_ > painful since both the elevator and the disk's cache will reorder the > IOs, so I can see how that would slip by. Hi, will try to have a look. But can it also be that the history of 128 entries is too small under my workload and bcache does not detect the sequence? Is there a way to try with a higher value like 1024? Stefan -- To unsubscribe from this list: send the line "unsubscribe linux-bcache" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
