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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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