ZFS writes slow with calls to arc_buf_alloc_hole()->arc_cksum_compute()
Last updated on JULY 29, 2016
Applies to:Solaris Operating System - Version 10 9/10 U9 to 11.2 [Release 10.0 to 11.0]
Information in this document applies to any platform.
File write on ZFS dataset is observed to be slow. Profiling data will show that there are frequent calls into arc_buf_cksum_compute().
The write() system call calls arc_buf_alloc_hole()->arc_cksum_compute(), resulting in write latency.
Customer has recently applied zfs patch 150125-03 (sparc) or 149637-03 (x86) or later, but without 150400-21(sparc) or 150401-21(x86).
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