> On Mar 8, 2016, at 10:07 AM, Slawa Olhovchenkov <s...@zxy.spb.ru> wrote: > > 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.
Hi, I’m not sure I understand what you’re saying. You said that you tried 8192, but the system still complained of being out of chain frames? Now you are trying fewer, only 3192? Thanks, Scott _______________________________________________ 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"
