[Samba] Multipathing read performance

[Jeremy Allison]

On Wed, Aug 17, 2022 at 09:53:54AM -0300, Austin Axworthy via samba wrote:
>Hello,
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>I am currently using Rocky Linux 8.6 with samba version 4.15.5-5.
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>When implementing multipath functionality to samba, I am consistently seeing
>an increase in write performance of 80% increase, but the reads increase by
>about 20-30%. I have tested both on HDD and SSD zfs pools.
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>The single windows client has 2 10Gb/s connections between them, and when
>benchmarking the array the raid should be able to fully saturate the 2
>pipes. When looking at the network traffic on a write operation I see 100
>percent usage on both interfaces, but when reading I am seeing 50 percent
>usage on both pipes.
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>Is this the expected increase in performance you would expect when using
>samba multipath? With a large increase in performance to our write speed to
>the samba server.

Hmmm. Seems a little strange only 50% usage for reads.

Have you tried the io_uring VFS module ? That may help.