19 lines
577 B
Bash
19 lines
577 B
Bash
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#!/bin/sh
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# This script relaxes iommu for the devices, relaxing memory
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# protection, but we consider it a fine tradeoff because those
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# hardware blocks don't have firmware on them.
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# It Increases eMMC speed by 15% according to gnome disks benchmark
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# with sample size 1000 MiB and number of samples 2.
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iommus="
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/sys/devices/platform/soc@0/7c4000.mmc/iommu_group/type
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/sys/devices/platform/soc@0/8804000.mmc/iommu_group/type
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/sys/devices/platform/soc@0/a6f8800.usb/a600000.usb/iommu_group/type
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"
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for iommu in $iommus; do
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[ -f "$iommu" ] && echo "DMA-FQ" > "$iommu"
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done
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