Scylla: Bad performance on default CentOS/RHEL 7.0 kernel

[avikivity]

Good xfs append support was introduces in 3.10.0-257.el7:

• Thu May 28 2015 Rafael Aquini [email protected] [3.10.0-257.el7]
• [fs] xfs: allow appending aio writes (Eric Sandeen) [1053615]

We need to ensure, that if running on RHEL or CentOS, the kernel is at least that version.

[avikivity]

| OS | Variant | Kernel | Good? |
| --- | --- | --- | --- |
| 7.0 | Release | 3.10.0-123.el7.x86_64 | No |
| | Updates | 3.10.0-123.1.2.el7 | No |
| 7.1 | Release | 3.10.0-229.el7 | No |
| | Updates | 3.10.0-229.20.1.el7 | No |
| 7.2 | Release | 3.10.0-327.el7 | Yes |

[avikivity]

Conclusion, 7.2 is the minimum supported version.

[tzach]

@avikivity whats the status of Ubuntu 14.04 with XFS?

[avikivity]

Not yet known. I see that 14.04 ships about 2,665 kernel, hopefully at least one will have good support.