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352ccf890a
Turns out that picking an idle CPU for floating interrupts has some negative side effects. The guest will keep the IO workload on its CPU and rather use an IPI from the interrupt CPU instead of moving workload. For example a guest with 2 vCPUs and 1 fio process might run that fio on vcpu1. If after diag500 both vCPUs are idle then vcpu0 is woken up. The guest will then do an IPI from vcpu0 to vcpu1. So lets change the heuristics and prefer the last CPU that went to sleep. This one is likely still in halt polling and can be woken up quickly. This patch shows significant improvements in terms of bandwidth or cpu consumption for fio and uperf workloads and seems to be a net win. Link: https://lore.kernel.org/linux-s390/20250904113927.119306-1-borntraeger@linux.ibm.com/ Reviewed-by: Christoph Schlameuß <schlameuss@de.ibm.com> Signed-off-by: Christian Borntraeger <borntraeger@linux.ibm.com> |
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| arch | ||
| block | ||
| certs | ||
| crypto | ||
| Documentation | ||
| drivers | ||
| fs | ||
| include | ||
| init | ||
| io_uring | ||
| ipc | ||
| kernel | ||
| lib | ||
| LICENSES | ||
| mm | ||
| net | ||
| rust | ||
| samples | ||
| scripts | ||
| security | ||
| sound | ||
| tools | ||
| usr | ||
| virt | ||
| .clang-format | ||
| .clippy.toml | ||
| .cocciconfig | ||
| .editorconfig | ||
| .get_maintainer.ignore | ||
| .gitattributes | ||
| .gitignore | ||
| .mailmap | ||
| .pylintrc | ||
| .rustfmt.toml | ||
| COPYING | ||
| CREDITS | ||
| Kbuild | ||
| Kconfig | ||
| MAINTAINERS | ||
| Makefile | ||
| README | ||
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the reStructuredText markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.