illumos gate

I can't say for certain which revision caused this, but I'm seeing a constant 8KB/sec load on my L2ARC device in my pool, regardless of how idle it is.

                             capacity     operations     bandwidth 
pool                       alloc   free   read  write   read  write
-------------------------  -----  -----  -----  -----  -----  -----
rpool1                      107G   115G      0      0      0      0
  c8t5001B44F00970028d0s0   107G   115G      0      0      0      0
-------------------------  -----  -----  -----  -----  -----  -----
sqlpool                    29.8G   192G      0      0      0      0
  mirror                   9.98G  64.0G      0      0      0      0
    c8t50014EE6034B2CC7d0      -      -      0      0      0      0
    c8t50014EE0ABA3B6B9d0      -      -      0      0      0      0
  mirror                   9.97G  64.0G      0      0      0      0
    c5t4d0                     -      -      0      0      0      0
    c5t5d0                     -      -      0      0      0      0
  mirror                   9.88G  64.1G      0      0      0      0
    c5t1d0                     -      -      0      0      0      0
    c8t50014EE057470E4Bd0      -      -      0      0      0      0
logs                           -      -      -      -      -      -
  c15tE4D25CFBDE0F0100d0     40K  54.5G      0      0      0      0
cache                          -      -      -      -      -      -
  c5t2d0                   4.98G  88.1G      0      0      0  7.95K
-------------------------  -----  -----  -----  -----  -----  -----
                             capacity     operations     bandwidth 
pool                       alloc   free   read  write   read  write
-------------------------  -----  -----  -----  -----  -----  -----
rpool1                      107G   115G      0      0      0      0
  c8t5001B44F00970028d0s0   107G   115G      0      0      0      0
-------------------------  -----  -----  -----  -----  -----  -----
sqlpool                    29.8G   192G      0      0      0      0
  mirror                   9.98G  64.0G      0      0      0      0
    c8t50014EE6034B2CC7d0      -      -      0      0      0      0
    c8t50014EE0ABA3B6B9d0      -      -      0      0      0      0
  mirror                   9.97G  64.0G      0      0      0      0
    c5t4d0                     -      -      0      0      0      0
    c5t5d0                     -      -      0      0      0      0
  mirror                   9.88G  64.1G      0      0      0      0
    c5t1d0                     -      -      0      0      0      0
    c8t50014EE057470E4Bd0      -      -      0      0      0      0
logs                           -      -      -      -      -      -
  c15tE4D25CFBDE0F0100d0     40K  54.5G      0      0      0      0
cache                          -      -      -      -      -      -
  c5t2d0                   4.98G  88.1G      0      0      0  7.96K
-------------------------  -----  -----  -----  -----  -----  -----

                    extended device statistics              
    r/s    w/s   kr/s   kw/s wait actv wsvc_t asvc_t  %w  %b device
    0.0    1.6    0.0  113.3  0.0  0.0    0.0    0.2   0   0 c15tE4D25CFBDE0F0100d0
    0.1    0.2    2.5    3.9  0.0  0.0    1.5    0.2   0   0 rpool1
    0.0    1.1    0.1   45.2  0.0  0.0    0.0    0.3   0   0 c5t2d0
    0.1    0.9    3.4   28.3  0.0  0.0    0.2    0.9   0   0 c5t4d0
    0.1    0.9    3.6   28.3  0.0  0.0    0.1    0.9   0   0 c5t5d0
    0.1    0.9    3.7   28.2  0.0  0.0    0.1    0.4   0   0 c5t1d0
    0.1    0.9    3.6   28.2  0.0  0.0    0.0    1.0   0   0 c8t50014EE057470E4Bd0
    0.1    0.9    3.4   28.2  0.0  0.0    0.0    1.0   0   0 c8t50014EE0ABA3B6B9d0
    0.1    0.9    3.9   28.2  0.0  0.0    0.0    0.4   0   0 c8t50014EE6034B2CC7d0
    0.1    0.2    2.5    3.9  0.0  0.0    0.0    0.2   0   0 c8t5001B44F00970028d0
    0.6    8.1   21.8  327.8  0.1  0.0   11.1    0.7   0   0 sqlpool
                    extended device statistics              
    r/s    w/s   kr/s   kw/s wait actv wsvc_t asvc_t  %w  %b device
    0.0    1.0    0.0    8.0  0.0  0.0    0.0    0.2   0   0 c5t2d0
    0.0    1.0    0.0    8.0  0.0  0.0    0.0    0.3   0   0 sqlpool
                    extended device statistics              
    r/s    w/s   kr/s   kw/s wait actv wsvc_t asvc_t  %w  %b device
    0.0    1.0    0.0    8.0  0.0  0.0    0.0    0.2   0   0 c5t2d0
    0.0    1.0    0.0    8.0  0.0  0.0    0.0    0.2   0   0 sqlpool
                    extended device statistics              
    r/s    w/s   kr/s   kw/s wait actv wsvc_t asvc_t  %w  %b device
    0.0    1.0    0.0    8.0  0.0  0.0    0.0    0.2   0   0 c5t2d0
    0.0    1.0    0.0    8.0  0.0  0.0    0.0    0.2   0   0 sqlpool
                    extended device statistics              
    r/s    w/s   kr/s   kw/s wait actv wsvc_t asvc_t  %w  %b device
    0.0    1.0    0.0    8.0  0.0  0.0    0.0    0.2   0   0 c5t2d0
    0.0    1.0    0.0    8.0  0.0  0.0    0.0    0.3   0   0 sqlpool
                    extended device statistics              
    r/s    w/s   kr/s   kw/s wait actv wsvc_t asvc_t  %w  %b device
    0.0    1.0    0.0    8.0  0.0  0.0    0.0    0.2   0   0 c5t2d0
    0.0    1.0    0.0    8.0  0.0  0.0    0.0    0.3   0   0 sqlpool

For the sake of not slowly killing the flash, it'd be nice to get to the bottom of this at some point (even if it is cheap TLC).