slow graid mirror rebuild

Setting kern.geom.raid.idle_threshold to lower value increases speed of rebuilding graid mirror and transfer on ada1 disk
https://www.freebsd.org/cgi/man.cgi?graid(8)

root@thirdeye:/usr/ports # sysctl kern.geom.raid.idle_threshold=1000000
kern.geom.raid.idle_threshold: 10000 -> 1000000
root@thirdeye:/usr/ports # iostat 1 -1
       tty            ada0             ada1             ada2             cpu
 tin  tout  KB/t tps  MB/s   KB/t tps  MB/s   KB/t tps  MB/s  us ni sy in id
   0     3 59.55  18  1.06  114.09   7  0.80   6.10   2  0.01   2  0  1  0 97
   0   533 86.86  14  1.18  128.00   8  0.99   0.00   0  0.00   0  0  0  0 100
   0   374 32.00   6  0.19   0.00   0  0.00   0.00   0  0.00   0  0  0  0 100
   0   194 32.00   6  0.19   0.00   0  0.00   0.00   0  0.00   0  0  0  0 100
   0   193 32.00   6  0.19   0.00   0  0.00   0.00   0  0.00   1  0  0  0 99
   0   190 80.00  16  1.23  128.00   8  0.99   0.00   0  0.00   1  0  1  0 99
   0   197 32.00   2  0.06   0.00   0  0.00   0.00   0  0.00   0  0  0  0 100
   0   188 32.00   4  0.12   0.00   0  0.00   0.00   0  0.00   0  0  0  0 100
   0   199 32.00   6  0.19   0.00   0  0.00   0.00   0  0.00   0  0  0  0 99
   0   194 96.00  12  1.14  128.00   8  1.01   0.00   0  0.00   3  0  0  0 97
   0   186 35.56   9  0.30   0.00   0  0.00   0.00   0  0.00   5  0  1  0 94
   0   195 108.80  20  2.16  128.00  16  2.03   0.00   0  0.00   0  0  0  0 100
   0   200 32.00   4  0.13   0.00   0  0.00   0.00   0  0.00   0  0  0  0 100
^C   3   294 32.00   3  0.09   0.00   0  0.00   0.00   0  0.00   1  0  1  0 99
root@thirdeye:/usr/ports # sysctl kern.geom.raid.idle_threshold=10000
kern.geom.raid.idle_threshold: 1000000 -> 10000
root@thirdeye:/usr/ports # iostat 1 -1
       tty            ada0             ada1             ada2             cpu
 tin  tout  KB/t tps  MB/s   KB/t tps  MB/s   KB/t tps  MB/s  us ni sy in id
   0     3 59.57  18  1.07  114.09   7  0.80   6.10   2  0.01   2  0  1  0 97
   0   536 126.54 478 59.02  127.74 473 58.95   0.00   0  0.00   7  0  2  0 91
   0   373 126.37 427 52.75  127.26 425 52.88   0.00   0  0.00  11  0  1  0 88
   0   196 127.16 459 56.94  128.00 448 56.06   0.00   0  0.00   2  0  1  0 97
   0   188 126.36 451 55.60  128.00 446 55.72   0.00   0  0.00   2  0  1  0 97
   0   205 126.31 387 47.78  127.34 386 48.04   0.00   0  0.00   0  0  1  0 99
   0   196 127.15 451 55.97  128.00 440 54.97   0.00   0  0.00   0  0  0  0 99
   0   196 126.73 456 56.40  128.00 457 57.09   0.00   0  0.00   0  0  0  0 100
   0   197 126.09 434 53.39  128.00 423 52.83   0.00   0  0.00   0  0  0  0 99
   0   197 126.67 433 53.58  128.00 425 53.14   0.00   0  0.00   0  0  0  0 100
   0   198 126.91 441 54.69  127.78 441 55.07   0.00   0  0.00   0  0  0  0 99
   0   196 127.24 420 52.20  127.70 417 52.02   0.00   0  0.00   0  0  0  0 99
   0   193 126.75 453 56.13  128.00 441 55.08   0.00   0  0.00   0  0  0  0 99
   0   199 127.14 452 56.16  128.00 454 56.79   0.00   0  0.00   0  0  3  1 96
   0   196 125.17 427 52.19  126.96 421 52.19   0.00   0  0.00   6  0  1  1 93
   0   195 125.48 417 51.09  128.00 398 49.75   0.00   0  0.00  15  0  3  0 82
   0   193 126.76 460 56.89  128.00 458 57.20   0.00   0  0.00   5  0  1  0 94
   0   198 126.66 434 53.62  128.00 428 53.56   0.00   0  0.00   0  0  0  0 99
   0   194 126.51 447 55.19  127.79 444 55.38   0.00   0  0.00   5  0  2  0 92
   0   200 127.11 441 54.70  128.00 433 54.07   0.00   0  0.00   0  0  0  0 100
   0   193 127.14 435 54.04  128.00 429 53.67   0.00   0  0.00   0  0  0  1 99
^C   2   227 127.02 450 55.80  128.00 449 56.08   0.00   0  0.00   0  0  0  0 100
root@thirdeye:/usr/ports # graid status
   Name    Status  Components
raid/r0  DEGRADED  ada0 (ACTIVE (ACTIVE))
                   ada1 (ACTIVE (REBUILD 46%))
raid/r1   OPTIMAL  ada2 (ACTIVE (ACTIVE))
                   ada3 (ACTIVE (ACTIVE))

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