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View Code? Open in Web Editor NEWnotes on using eBPF and other means to distribute subtasks to offload engines, like NVMe/comp.stg
License: GNU General Public License v3.0
notes on using eBPF and other means to distribute subtasks to offload engines, like NVMe/comp.stg
License: GNU General Public License v3.0
Overview: miscible rpc in coherent multiarch dmaspaces, allows osmotic refactoring Central concept in various diverse ramblings since systemclick.org started as pencil sketches in 2013 before I joined Cavium, where the ideas of migration of workload to programmable offload engines seemed applicable, but go no traction. Now dropping these disorganized notes to public location preparatory to joining Google, to avert any future claims that they might have been developed within Google. Inspired by some beautiful design abstractions in a project that was conceived with one hand behind it's back, destined never to upstream - the Click Modular Router. Also Xpra, an X11-py-rpc-py-X11 as a target of a slightly different sister project, osmotic py rpc Also inspiration from early access to the no-shared-mem message passing unix port of the elxi6400, a radical 1980's capability architecture But I'll now recast it in the language of kernel/eBPF/user interactions, to show how we can model the expected performance improvement of FPGA-or-ASIC-or-cloud decomposition eBPF is increasingly being used in places where user/kernel or kernel/hw or user/hw interactions can be precompiled and prevalidated. This means various interactions can shortcut more expensive callchains which dance between kernel/user spaces to consult user policy, when the policy can be formulated in eBPF, validated, installed in kernel, so less trust/locality zones need to be transited to process an event. The same technique can be used where NVMe/comp.stg allows lower layers of filesystem or search processing to be subcontracted to storage leaves
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