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MFC 340460: Convert the number of MSI IRQs on x86 from a constant to a tunable.

Description

MFC 340460: Convert the number of MSI IRQs on x86 from a constant to a tunable.

The number of MSI IRQs still defaults to 512, but it can now be
changed at boot time via the machdep.num_msi_irqs tunable.

Relnotes: yes

Details

Provenance
jhbAuthored on
Parents
rS342655: MFC 340465: Use sbsndptr_adv() instead of sbsndptr() for TOE TLS.
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