On Thu, Sep 09, 2010 at 01:39:10PM +0100, wrote: > It has been pointed out that the fix potentially increases the number of > IPIs sent. On larger machines, I worry that these delays could be severe > and we'll see other problems down the line. Hence, I'd like to reduce > the number of calls to drain_all_pages() without eliminating them > entirely. I'm currently in the process of testing the following patch > but can you try it as well please? > > In particular, I am curious to see if the performance of fs_mark > improves any and if the interrupt counts drop as a result of the patch. The interrupt counts have definitely dropped - this is after creating 200M inodes and then removing them all: CAL: 11154 10596 11804 15366 10048 12916 13049 9864 That's in the same ballpark as a single 50M inode create run without the patch. Performance seems a bit lower, though (2-3% maybe less), and CPU usage seems a bit higher (stays much closer to 800% than 700-750% without the patch). Those are subjective observations from watching graphs and counters, so take them with a grain of salt. Cheers, Dave. -- Dave Chinner david@xxxxxxxxxxxxx -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxxx For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>