Re: [RFC PATCH 0/1] Large folios in block buffered IO path

Matthew Wilcox
2024-11-28T04:22:36Z

On Thu, Nov 28, 2024 at 09:31:50AM +0530, Bharata B Rao wrote:
> However a point of concern is that FIO bandwidth comes down drastically
> after the change.
>
> default inode_lock-fix
> rw=30%
> Instance 1 r=55.7GiB/s,w=23.9GiB/s r=9616MiB/s,w=4121MiB/s
> Instance 2 r=38.5GiB/s,w=16.5GiB/s r=8482MiB/s,w=3635MiB/s
> Instance 3 r=37.5GiB/s,w=16.1GiB/s r=8609MiB/s,w=3690MiB/s
> Instance 4 r=37.4GiB/s,w=16.0GiB/s r=8486MiB/s,w=3637MiB/s

Something this dramatic usually only happens when you enable a debugging
option. Can you recheck that you're running both A and B with the same
debugging options both compiled in, and enabled?