Specify the number of hugepages ( here I am using 512 as an example, you might need to change that depending on your use case.)
#Benchmark cpu linux update
Append “iommu.passthrough=1 into GRUB_CMDLINE_LINE in /etc/default/grub update grub config and reboot the system.
#Benchmark cpu linux full
It has been observed that on Cavium Thunder X2 setting the kernel command line parameter iommu.passthrough=1, Flexible I/O Tester Synthetic Benchmark (Fio) performance (with 4k page size) was comparable to that of 64k pages.Įlevated security risk: Disabling IOMMU exposes all of your RAM to full access by USB4, Thunderbolt, or other PCIe devices. This will need to be set at the time of deployment (using preseeds) or by editing the appropriate grub configuration files and reboot the system for the changes to take effect. Setting iommu.passthrough to 1 on th kernel command line bypasses the IOMMU translation for DMA, setting it to 0 uses IOMMU translation for DMA.
There are ways to get comparable performance using 4k page size and avoid the penalties of 64k pages. Improve performance benchmarks with 4k pages 64k page size will need to reconsidered with the introduction of 52bit VA Also, 64k page size could break compatibility with old ARMv7 binaries. 64k page sizes are beneficial to certain memory bound benchmarks, but there is a penalty, it might be wasteful if you are dealing with small data structures that have to be page aligned. Ubuntu currently supports 4k page size for all architectures except for ppc64el. Here are several options you would like to use for best performance. Ubuntu is built based on balance of hardware capability, performance and security. Improve performance benchmarks with 4k pages.Update against latest upstream Linux kernel. Update against Linux 3.18-rc6 kernel due to the explicit GNU89 kernel change recently to allow this to work better on GCC5. Pts/build-linux-kernel-1.5.1 Thu, 22:07:50 GMTįix rc3/rc6 typo in previous commit pre.sh
Simplify make defconfig to better support other architectures. Pts/build-linux-kernel-1.5.3 Fri, 22:03:03 GMTĪdd bc as external dependency - not installed by default on Arch. Update against upstream Linux 4.9.0 kernel Update against upstream Linux 4.18, add bison/flex/openssl external dependencies, tweak the def config to avoid libelf dependency. Somehow TimesToRun got overrode to 1 on upload. Update against latest Linux 5.4 LTS point release to fix GCC 10 build problems. Pts/build-linux-kernel-1.10.2 Tue, 10:33:24 GMTĪdd libelf.h as a SystemDependencies, addressing possible build issue outlined in
#Benchmark cpu linux series
Move to Linux 5.10 LTS series (5.10.20) kernel build. Update against Linux 5.14 upstream since prior version used is having build issues on newer distros. Update against Linux 5.16 upstream to address build problems on newer distros. Update against Linux 5.18 upstream, pull in via Closes: Also add cpio as possible system dependency - Fixes:
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