The fpstate is essentially a snapshot of the floating-point processor's state at any given time. This includes:
No. The VA only recognizes one accredited representative at a time.
If you have a VSO (e.g., DAV) and then sign a contract with an attorney, the VA requires you to revoke the VSO’s POA using VA Form 21-22 (Revocation). You will then file VA Form 21-22a naming the attorney as your FPSTATE representative.
Warning: Switching representatives mid-claim can cause delays. Your old VSO must release the file, and the new attorney must get "up to speed."
Enable developers using VS Online (or VS Code Remote) to inspect, snapshot, and compare floating-point unit (FPU) state (x87/SSE/AVX registers) during debug sessions, with minimal latency and full fidelity.
cat /proc/self/status | grep -i fpu
If you see xstate_size larger than your kernel stack size, VSO is likely active.
On Windows: Not directly exposed. Windows uses KeSaveExtendedProcessorState with pre-allocated buffers per thread (no VSO equivalent).
| Criteria | Rating (out of 10) | |----------|--------------------| | Performance | 7/10 (minor branch overhead) | | Memory Efficiency | 9/10 | | Security | 8/10 (safe if other mitigations on) | | Developer Friendliness | 2/10 (kernel-only, high complexity) | | Documentation Quality | 4/10 (scattered in LKML, no central guide) |
Conclusion: FPState VSO is a brilliant, invisible piece of kernel engineering that makes modern x86 systems more memory-efficient without sacrificing security. If you are not writing kernel code or debugging kernel crashes, you will never interact with it directly. If you are a kernel developer, understanding VSO is essential to avoid subtle corruption bugs and stack overflows on AVX-512 workloads.
Recommendation: Use it if you are on Linux kernel 5.7+ with CONFIG_X86_FPU=y and need to scale threads. Avoid if you require deterministic timing (use nofpstate_vso kernel boot parameter to disable). fpstate vso
fpstate=vso " is a technical URL parameter used by Google Search to trigger specific full-page states, most notably for the Google Search Generative Experience (SGE) AI Overview When this parameter is appended to a search URL (e.g., #fpstate=vso
), it typically forces the browser to display a specialized interactive view, such as a dedicated AI-generated summary page or specific list-based tools like Google Jobs. Review of "fpstate=vso" (AI Overview Mode) : Users primarily use this string to bypass or trigger
AI results. For those who find AI Overviews intrusive, adding or modifying this parameter is a known workaround to return to a traditional link-only view. Conversely, developers and SEO specialists use it to audit how AI summarizes their content. Performance
: It effectively isolates the AI's "Voice Search Result" (often what the "VSO" likely stands for) into a full-screen, readable format. Accessibility : It is frequently used in shared links on platforms like
to point users directly to a specific search tool, like a job board or a direct answer, without them having to re-type the query. Why you see it The fpstate is essentially a snapshot of the
You likely encountered this while copying a URL from a mobile search result or an AI-summarized page. It is not a standalone consumer product, but rather a for Google's search infrastructure. use or disable this specific search view in your browser?
Navigating the Department of Veterans Affairs (VA) claims process is often described as a marathon, not a sprint. For many veterans, the most critical decision they make—outside of gathering medical evidence—is choosing who will represent them. This decision boils down to two distinct acronyms: FPSTATE and VSO.
If you have spent any time on VA Form 21-22 (Appointment of Veterans Service Organization as Claimant's Representative) or VA Form 21-22a (Appointment of Individual as Claimant's Representative), you have seen these codes. But what do they mean? Is one better than the other? Can a veteran use both?
This comprehensive guide breaks down the legal distinctions, practical applications, and strategic advantages of listing a FPSTATE versus a VSO as your representative.
Saving and restoring the entire FPState on every context switch is expensive, especially with large register files (AVX-512 can be ~2.5KB per task). Early operating systems did exactly this, leading to significant overhead in FPU-heavy workloads. Enable developers using VS Online (or VS Code
The Variable State Object (VSO) architecture represents a paradigm shift. Instead of assuming the maximum size, the kernel now treats the FPU state as a dynamic, variable-sized object.
Here is how fpstate VSO changes the game: