On Mon, Aug 11, 2014 at 11:05:09AM -0700, Darrick J. Wong wrote: > > Using the bitmap turns out to be pretty quick (~130us to start RA for 4 groups > vs. ~70us per group if I issue the RA directly). Each fadvise call seems to > cost us ~1ms, so I'll keep using the bitmap to minimize the number of fadvise > calls, since it's also a lot less code. 4 groups? Since the default flex_bg size is 16 block groups, I would have expected that you would want to start RA every 16 groups. (And BTW, I've been wondering whether we should increase the flex_bg size for bigger file systems. By the time we get to 4TB disks, Having a flex_bg every 2GB seems a little small.) - Ted -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
