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Improve write performance by using dmu_read_by_dnode() #9156

Merged
merged 1 commit into from
Aug 15, 2019
Merged

Improve write performance by using dmu_read_by_dnode() #9156

merged 1 commit into from
Aug 15, 2019

Commits on Aug 14, 2019

  1. Improve write performance by using dmu_read_by_dnode() 

    In zfs_log_write(), we can use dmu_read_by_dnode() rather than
dmu_read() thus avoiding unnecessary dnode_hold() calls.

We get a 2-5% performance gain for large sequential_writes tests, >=128K
writes to files with recordsize=8K.

Testing done on Ubuntu 18.04 with 4.15 kernel, 8vCPUs and SSD storage on
VMware ESX.

Signed-off-by: Tony Nguyen <tony.nguyen@delphix.com>
    @tonynguien
    tonynguien committed Aug 14, 2019
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