On Sat, Mar 11, 2017 at 11:54 AM, Ashijeet Acharya <ashijeetacha...@gmail.com> wrote: > This series optimizes the I/O performance of VMDK driver. > > Patch 1 makes the VMDK driver to allocate multiple clusters at once. Earlier > it used to allocate cluster by cluster which slowed down its performance to a > great extent. > > Patch 2 changes the metadata update code to update the L2 tables for multiple > clusters at once.
This patch series is a performance optimization. Benchmark results are required to justify optimizations. Please include performance results in the next revision. A popular disk I/O benchmarking is fio (https://github.com/axboe/fio). I suggest a write-heavy workload with a large block size: $ cat fio.job [global] direct=1 filename=/dev/vdb ioengine=libaio runtime=30 ramp_time=5 [job1] iodepth=4 rw=randwrite bs=256k $ for i in 1 2 3 4 5; do fio --output=fio-$i.txt fio.job; done # WARNING: overwrites /dev/vdb It's good practice to run the benchmark several times because there is usually some variation between runs. This allows you to check that the variance is within a reasonable range (5-10% on a normal machine that hasn't been specially prepared for benchmarking). Stefan
