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Bhupesh Sharma says: ==================== net: Optimize the qed* allocations inside kdump kernel Changes since v1: ---------------- - v1 can be seen here: http://lists.infradead.org/pipermail/kexec/2020-May/024935.html - Addressed review comments received on v1: * Removed unnecessary paranthesis. * Used a different macro for minimum RX/TX ring count value in kdump kernel. Since kdump kernel(s) run under severe memory constraint with the basic idea being to save the crashdump vmcore reliably when the primary kernel panics/hangs, large memory allocations done by a network driver can cause the crashkernel to panic with OOM. The qed* drivers take up approximately 214MB memory when run in the kdump kernel with the default configuration settings presently used in the driver. With an usual crashkernel size of 512M, this allocation is equal to almost half of the total crashkernel size allocated. See some logs obtained via memstrack tool (see [1]) below: dracut-pre-pivot[676]: ======== Report format module_summary: ======== dracut-pre-pivot[676]: Module qed using 149.6MB (2394 pages), peak allocation 149.6MB (2394 pages) dracut-pre-pivot[676]: Module qede using 65.3MB (1045 pages), peak allocation 65.3MB (1045 pages) This patchset tries to reduce the overall memory allocation profile of the qed* driver when they run in the kdump kernel. With these optimization we can see a saving of approx 85M in the kdump kernel: dracut-pre-pivot[671]: ======== Report format module_summary: ======== dracut-pre-pivot[671]: Module qed using 124.6MB (1993 pages), peak allocation 124.7MB (1995 pages) <..snip..> dracut-pre-pivot[671]: Module qede using 4.6MB (73 pages), peak allocation 4.6MB (74 pages) And the kdump kernel can save vmcore successfully via both ssh and nfs interfaces. This patchset contains two patches: [PATCH 1/2] - Reduces the default TX and RX ring count in kdump kernel. [PATCH 2/2] - Disables qed SRIOV feature in kdump kernel (as it is normally not a supported kdump target for saving vmcore). [1]. Memstrack tool: https://github.com/ryncsn/memstrack ==================== Signed-off-by: David S. Miller <davem@davemloft.net> |
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Linux kernel
============
There are several guides for kernel developers and users. These guides can
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In order to build the documentation, use ``make htmldocs`` or
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There are various text files in the Documentation/ subdirectory,
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Please read the Documentation/process/changes.rst file, as it contains the
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the problems which may result by upgrading your kernel.