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Clear out junk files and repair common Windows errorsFree Scan →Scan for outdated or missing drivers - takes under a minuteDriver Scan →No—not by itself. Linux eBPF can steer certain socket traffic and XDP can redirect packets, but the kernel documentation for these mechanisms does not describe preserving or migrating a running process, CUDA context, or GPU memory during a spot-instance eviction. They may be components of a network failover design; recovering useful GPU work requires a separate strategy for saving and restoring application state.
What eBPF socket redirection can—and cannot—do
“Socket hijacking” is an imprecise label for several distinct Linux mechanisms. Sockmap and sockhash programs can apply policy to socket traffic and redirect eligible messages or socket buffers (SKBs) among sockets. The Linux sockmap and sockhash documentation describes these as data-path operations. It does not describe moving a process or its GPU state to another machine.
That distinction matters during an eviction. Network traffic is only one part of a workload: the process may also hold model and optimizer state, GPU allocations, framework state, file descriptors, and unfinished requests. The cited eBPF APIs do not establish how to save or reconstruct any of those. Redirecting traffic therefore cannot, on the evidence of these APIs, be treated as a way to preserve a CUDA context or resume computation where it stopped.
Which Linux mechanisms are involved?
| Mechanism | What the kernel documentation supports | Important boundary |
|---|---|---|
| Sockmap / sockhash | Map-backed socket references, with BPF parser and verdict programs that can pass, drop, or redirect eligible message- or SKB-level traffic. | Socket traffic handling, not process or GPU-state migration. Program attachment and socket-map constraints affect the data-path design. |
sk_lookup |
Selection of a listening TCP or unconnected UDP socket when the transport layer looks up a socket for an incoming packet. | It does not run for traffic delivered to established TCP or connected UDP sockets. |
| AF_XDP with XSKMAP and XDP_REDIRECT | Redirection of ingress frames to an AF_XDP socket in user space, subject to device, queue, driver, and ring/UMEM requirements. | Packet-level delivery, not transfer of an application’s session or GPU state; driver support and operating mode constrain portability. |
Sockmap and sockhash: policy on socket traffic
BPF_MAP_TYPE_SOCKMAP is array-backed and BPF_MAP_TYPE_SOCKHASH is hash-backed. BPF programs attached to these maps can include parsers and verdict programs. The documented helpers include bpf_msg_redirect_map() and bpf_msg_redirect_hash() for message-level handling, and bpf_sk_redirect_map() and bpf_sk_redirect_hash() for SKB-level handling. Those helpers provide ways to make traffic decisions; they are not general-purpose operations for transplanting a process’s sockets to another host.
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Attaching a socket to a map also changes how its data path is handled: the documentation describes attaching sk_psock behavior and replacing socket callbacks, with sockets inheriting the map’s programs. This is a deliberate socket-path configuration, not an invisible failover layer. A socket cannot inherit multiple parser or verdict programs of the same relevant category; conflicting parser programs can produce EBUSY, and one map cannot attach both stream-verdict and SKB-verdict programs.
Other helpers refine parsing and verdict behavior rather than preserving application state. bpf_msg_cork_bytes() can delay a verdict until a specified number of bytes arrive; bpf_msg_apply_bytes() can apply a verdict across a byte span. bpf_msg_pull_data() may copy data and invalidate earlier verifier pointer checks in relevant circumstances, so a BPF program must repeat those checks. These details matter when designing a parser, but they do not checkpoint a model or serialize a live session.
sk_lookup: choosing a socket for certain incoming traffic
The Linux sk_lookup documentation describes a hook for selecting sockets in cases such as wide address or port ranges and L7 proxy designs. It runs when the transport layer needs to find a listening TCP or unconnected UDP socket for an incoming packet. A program can select a socket from a map with bpf_sk_assign() and return SK_PASS; SK_DROP drops the packet.
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The hook’s boundary rules out treating it as a universal takeover point: established TCP traffic and connected UDP traffic bypass it. A design using sk_lookup for failover would need to specify how clients reach the replacement endpoint, which new connections are steered, and how the receiving application creates a valid session. Socket selection at this lookup point does not, by itself, move an established connection’s state.
AF_XDP and XDP_REDIRECT: steering packets
AF_XDP is a packet-processing path to user space: an XDP program can use XSKMAP to direct ingress frames to an AF_XDP socket. The socket must match the network device and queue that handled the packet; a mismatch or empty map entry drops the frame. AF_XDP uses UMEM and producer/consumer rings, and sharing UMEM does not mean processes can freely share every ring.
AF_XDP may use copy or zero-copy mode depending on driver capability and requested flags; forcing zero-copy can fail when unsupported. The documentation’s overview describes copying data to user space even while discussing driver-supported operation, so it does not justify a universal zero-copy claim. Likewise, XDP_REDIRECT supports selected map types, including devmap, cpumap, and XSKMAP, but redirected transmission and non-linear-frame support are not available from every driver. Its documented redirect path queues the target through the driver and flushes the redirect queue before the NAPI poll completes; XDP tracepoints can help diagnose redirect errors and drops.
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Why network continuity is not GPU context continuity
A GPU workload’s “context” could mean weights, optimizer state, an in-memory cache, framework execution state, in-flight requests, or merely the network endpoint through which clients reach it. Those are different recovery targets. The kernel references above document socket and packet handling only; they do not establish transfer of GPU allocations, process memory, CUDA execution state, locks, file descriptors, or application-level request semantics.
Even successful steering to a replacement worker would not show that the new worker has the evicted process’s state. A client connection might need to retry, or an application-aware proxy might need to establish a new session. Which behavior is possible depends on the application and recovery design; it is not guaranteed by the socket or packet redirection APIs.
What a plausible recovery design would still need
eBPF could be investigated as one part of a larger design, chiefly for steering eligible network traffic. A recovery plan would need to define and validate each of these separate responsibilities:
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- Define recoverable progress. Decide exactly what “context” means for the workload and what state must survive for useful work to resume.
- Save durable application state. Establish how progress is checkpointed somewhere the replacement worker can access. The eBPF references do not specify a checkpoint format, cadence, or recovery guarantee.
- Start and restore a replacement. Specify how orchestration provisions a worker, restores the saved state, and verifies that its GPU and software environment can run the workload.
- Re-establish service identity. Determine how clients find the replacement and whether recovery accepts only new connections or also requires application or proxy cooperation for sessions already in progress.
- Choose the network mechanism for a defined boundary. Use socket-level policy, socket lookup, or packet-level redirection only where its documented hook and device constraints match the intended traffic path.
- Test the actual deployment. Check the target kernel, NIC driver, cloud environment, BPF attach support, failure behavior, and application recovery. The kernel documentation does not provide cloud portability, eviction guarantees, or performance results for this combined design.
What the evidence does—and does not—establish
The Linux kernel documentation supports the existence of socket-level policy and redirection mechanisms, the bounded lookup behavior of sk_lookup, and packet delivery paths through AF_XDP/XDP_REDIRECT. It does not validate a system that combines them to preserve GPU work through spot eviction. No implementation result, benchmark, provider guarantee, eviction policy, or measured recovery time is established here, so a recovery-time or lost-work claim would require separate, deployment-specific evidence.
The linked kernel documentation was accessed on October 4, 2026. Its behavior and support should be checked against the exact kernel, NIC driver, and cloud environment being deployed.
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