ZFS secondarycache on SSD problem on r255173

[Dmitryy Makarov]

Hello, FreeBSD Current. 

Have some trouble with adding SSD drive as secondarycache device on 10.0-CURRENT FreeBSD 10.0-CURRENT #1 r255173 : 
SSD INTEL SSDSC2BW180A4 

dmesg: 
ada1 at ahcich2 bus 0 scbus4 target 0 lun 0 
ada1: <INTEL SSDSC2BW180A4 DC02> ATA-9 SATA 3.x device 
ada1: 300.000MB/s transfers (SATA 2.x, UDMA6, PIO 8192bytes) 
ada1: Command Queueing enabled 
ada1: 171705MB (351651888 512 byte sectors: 16H 63S/T 16383C) 
ada1: quirks=0x1<4K> 
ada1: Previously was known as ad8 


# diskinfo -v /dev/ada1 
/dev/ada1 
        512             # sectorsize 
        180045766656    # mediasize in bytes (167G) 
        351651888       # mediasize in sectors 
        4096            # stripesize 
        0               # stripeoffset 
        348861          # Cylinders according to firmware. 
        16              # Heads according to firmware. 
        63              # Sectors according to firmware. 
        BTDA326504N51802GN      # Disk ident. 

Creating partition and adding: 
# gpart create -s gpt ada1 
# gpart add -t freebsd-zfs -s3G -l zil0 ada1 
# gpart add -t freebsd-zfs  -l cache0 ada1 
# zpool add disk1 log /dev/gpt/zil0 
# zpool add disk1 cache /dev/gpt/cache0 

After that have: 
      log 

           gpt/zil0                                  ONLINE       0     0     0 
     cache 
          gpt/cache0    ONLINE       0     0     0  block size: 512B configured, 4096B native 

But why? ZFS can't properly set sector size for cache device (quirks=0x1<4K>)? 
And have some strange behavior with ZIl partition on the same SSD - everything works! 


Okay, was trying to do some workaround with GNOP: 
# gnop create -S4096 /dev/gpt/cache0 
# zpool add disk1 cache /dev/gpt/cache0.nop 

Seems to be OK 
 cache 
          gpt/cache0.nop    ONLINE       0     0     0 

But after reboot pool has 
status:One or more devices are configured to use a non-native block size. 
        Expect reduced performance. 

cache 
          gptid/39e40c33-1c4d-11e3-ac20-002590aa9548  ONLINE       0     0     0  block size: 512B configured, 4096B native 

And no gnop parts was found, and even gpart (in /dev/gpart) 

# gnop status 
# gnop: Command 'status' not available. 

# gpart show -l ada1 
=>  34  351651821  ada1  GPT  (167G) 
         34          6        - free -  (3.0k) 
         40    6291456     1  zil0  (3.0G) 
    6291496  345360352     2  cache0  (164G) 
  351651848          7        - free -  (3.5k) 

# ls /dev/gpt/cache* 
zsh: no matches found: /dev/gpt/cache* 


Please, help to deal with this problem. 
Or what else information can be useful to find out this trouble.