forked from vitalif/vitastor
Add note about NBD
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README.md
14
README.md
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@ -244,6 +244,20 @@ Vitastor was configured with: `--disable_data_fsync true --immediate_commit all
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--journal_no_same_sector_overwrites true --journal_sector_buffer_count 1024
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--journal_size 16777216`.
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### NBD
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NBD is currently required to mount Vitastor via kernel, but it imposes additional overhead
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due to additional copying between the kernel and userspace. This mostly hurts linear
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bandwidth, not iops.
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Vitastor with single-thread NBD on the same hardware:
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- T1Q1 write: 6000 iops (0.166ms latency)
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- T1Q1 read: 5518 iops (0.18ms latency)
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- T1Q128 write: 94400 iops
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- T1Q128 read: 103000 iops
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- Linear write (4M T1Q128): 1266 MB/s (compared to 2600 MB/s via fio)
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- Linear read (4M T1Q128): 975 MB/s (compared to 1400 MB/s via fio)
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## Building
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- Install Linux kernel 5.4 or newer for io_uring support.
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