On Fri, Jan 29, 2016 at 07:01:44PM +0800, Dennis Yang wrote: > I had tried to define MAX_DECS as 1, 16, and 8192, and here is the > throughput I got. > When #define MAX_DECS 1, throughput drops from 3.2GB/s to around 800 ~ 950 > MB/s. > When #define MAX_DECS 16, throughput drops from 3.2GB/s to around 150 ~ 400 > MB/s > When #define MAX_DECS 8192, the I/O blocks until deletion is done. > > These throughput is gathered by writing to a newly created thin device > which means lots of provisioning take place. So it seems that the more fine > grained lock we use here results in the higher throughput. Is there any > concern if I set MAX_DECS to 1 for production? Does the time taken to remove the thin device change as you drop it to one? - Joe -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel
