On Mon, Mar 07, 2016 at 02:10:12PM +0300, Slawa Olhovchenkov wrote: > > >>> This allocated one for all controllers, or allocated for every > > >>> controller? > > >> > > >> It’s per-controller. > > >> > > >> I’ve thought about making the tuning be dynamic at runtime. I > > >> implemented similar dynamic tuning for other drivers, but it seemed > > >> overly complex for low benefit. Implementing it for this driver > > >> would be possible but require some significant code changes. > > > > > > What cause of chain_free+io_cmds_active << max_chains? > > > One cmd can use many chains? > > > > Yes. A request uses and active command, and depending on the size of the > > I/O, > > it might use several chain frames.
I am play with max_chains and like significant cost of handling max_chains: with 8192 system resonded badly vs 2048. Now try 3192, response like with 2048. _______________________________________________ freebsd-stable@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/freebsd-stable To unsubscribe, send any mail to "freebsd-stable-unsubscr...@freebsd.org"
