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Is necessary to introduce rdtsc_ordered?

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#7 2 comments 0 reactions 0 assignees View on GitHub

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Assessment

Difficulty
4/5
Estimated time
3-5 days
Newbie friendliness
45/100
Issue type
Bug
Clarity
Mostly clear
Activity status
Quiet
Tech stack
rust
Domain
performance

Research direction

Start at src/tsc_now.rs line 157, where rdtsc is used, then compare the cited Linux implementation in arch/x86/include/asm/msr.h with the linked TSC usage pitfalls. Determine whether out-of-order execution affects this library's cycle readings and address the issue or document why no change is needed.

Written by the indexing model from the issue text.

Description

Hi, I notice that this library uses rdtsc to get the cycle. According to Pitfalls of TSC usage and implementation in linux kernel, rdtsc may encounter Out-of-Order Execution Issues. I'm not sure if this has been considered before — is this something that should be fixed?

Dominant language
Rust
Stars
41
Forks
12
No merged PRs in 30d

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