ZFS L2ARC - incorrect size and abnormal system load on r255173

[Vitalij Satanivskij]

Hello.

Patch worked as expected - no compresion on l2, but 

a) l2arc couse big overhad on fs io 
b) after some time errors apears again.


For now best choice not to use any patch on system

so, for now we delete next changes from system 

1) http://svnweb.freebsd.org/base?view=revision&sortby=file&revision=256889
2) http://svnweb.freebsd.org/base?view=revision&revision=255753


Yes, zpool status says 
        cache
          gpt/cache0    ONLINE       0     0     0  block size: 512B configured, 4096B native
          gpt/cache1    ONLINE       0     0     0  block size: 512B configured, 4096B native
          gpt/cache2    ONLINE       0     0     0  block size: 512B configured, 4096B native



But l2arc work as expected (no errors, no noticeable performance problem ) 

There is many another problem with performance on freebsd 10 after implement new vmem subsystem (at least no problem was before) 

but thay not corespond to l2 

Don't even know what to do with situation.



Vitalij Satanivskij wrote:
VS> I dont apply previos patch on high load server, only on test where find that it's not disabling compression.
VS> 
VS> Thank you for help, i will try new patch as soon as posible.
VS> 
VS> SH> 
VS> SH> Have you seen any l2_io_error or l2_cksum_bad since
VS> SH> applying the ashift patch?
VS> SH> 
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