Messages in this thread | | | Subject | Re: [bug report] iommu_dma_unmap_sg() is very slow then running IO from remote numa node | From | John Garry <> | Date | Thu, 22 Jul 2021 14:54:44 +0100 |
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On 22/07/2021 13:53, Marc Zyngier wrote: > Hi John, > > [...] > >> Your kernel log should show: >> [ 0.000000] GICv3: Pseudo-NMIs enabled using forced ICC_PMR_EL1 >> synchronisation > > Unrelated, but you seem to be running with ICC_CTLR_EL3.PMHE set, > which makes the overhead of pseudo-NMIs much higher than it should be > (you take a DSB SY on each interrupt unmasking). > > If you are not using 1:N distribution of SPIs on the secure side, > consider turning that off in your firmware. This should make NMIs > slightly more pleasant to use.
Thanks for the hint. I speak to the BIOS guys.
John
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