Drop performance guide until complete
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title = "Performance"
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weight = 30
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gVisor is designed to provide a secure, virtualized environment while preserving
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key benefits of containerization such as small fixed overheads and a dynamic
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resource footprint. For containerized infrastructure, this can provide an “easy
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button” for sandboxing untrusted workloads: there are no changes to the
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fundamental resource model.
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However, there are clear trade-offs in this approach. gVisor does not fully
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implement the system call surface provided by an upstream Linux kernel. We are
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always working to improve this support, and current limitations are described
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[Compatibility](../../user_guide/compatibility).
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gVisor also imposes runtime costs over native containers. These costs come in
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two forms: additional cycles and memory usage, and they come from two different
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sources. First, the existence of the Sentry itself means that additional memory
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will be required, and application system calls generally traverse additional
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layers. We place an emphasis on [Security](../security/) and therefore chose to
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use a language for the Sentry that provides lots of benefits in this domain, but
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may not offer the raw performance of other choices. Costs imposed by this design
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are structural costs.
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Second, as gVisor is a fresh implementation of the system call surface, many of
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the subsystems or specific calls are not as optimized as more mature
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implementations. A good example here is the network stack, which is continuing
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to evolve but does not support all the advanced recovery mechanisms offered by
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other stacks and is less CPU efficient. This an implementation cost and should
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not be confused with structural costs. Improvements here are ongoing and largely
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driven by the workloads that matter to gVisor contributors and users.
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## Structural Costs
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The structural costs of gVisor are heavily influenced by the platform choice,
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which implements system call interception. Today, gVisor supports a variety of
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platforms. These platforms present distinct performance, compatibility and
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security trade-offs. For example, the KVM platform low overhead system call
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interception but runs poorly with nested virtualization.
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@ -30,7 +30,3 @@ There are also different filesystem modes that can be used to avoid this issue.
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### What's the security model?
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See the [Security Model](../../architecture_guide/security/).
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### What's the expected performance?
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See the [Performance Guide](../../architecture_guide/performance/).
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