Messages in this thread | | | Date | Thu, 22 Jul 2021 13:53:59 +0100 | From | Marc Zyngier <> | Subject | Re: [bug report] iommu_dma_unmap_sg() is very slow then running IO from remote numa node |
| |
On 2021-07-22 12:12, John Garry 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.
M. -- Jazz is not dead. It just smells funny...
| |