> Subject: Re: [EXTERNAL] Re: [PATCH v2 0/2] vhost-vdpa: Add support for NO- > IOMMU mode > > On Wed, Oct 16, 2024 at 05:28:27PM +0000, Srujana Challa wrote: > > When using the DPDK virtio user PMD, we’ve noticed a significant 70% > > performance improvement when IOMMU is disabled on specific low-end > > x86 machines. This performance improvement can be particularly > > advantageous for embedded platforms where applications operate in > > controlled environments. Therefore, we believe supporting the > > intel_iommu=off mode is beneficial. > > While making the system completely unsafe to use. Maybe you should fix > your stack to use the iommu more itelligently instead? We observed better performance with "intel_iommu=on" in high-end x86 machines, indicating that the performance limitations are specific to low-end x86 hardware. This presents a trade-off between performance and security. Since intel_iommu is enabled by default, users who prioritize security over performance do not need to disable this option.
