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LR/SC Backoff Mechanism #2750

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Arhum-Ahmed opened this issue Jan 29, 2025 · 0 comments
Open

LR/SC Backoff Mechanism #2750

Arhum-Ahmed opened this issue Jan 29, 2025 · 0 comments
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notCV32A65X It is not an CV32A65X issue

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@Arhum-Ahmed
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Hi,

In the wt_dcache_missunit.sv, there is a module exp_backoff.sv instantiated in it. Above this module there is a comment stating "back-off mechanism for LR/SC completion guarantee".

Regrading this I have following questions:

  1. Why do we need a hardware mechanism for LR/SC? I mean we can identify the failure in the software in case of LR/SC (if the operation is successful it'll return 0, otherwise not).

  2. Is this some kind of a retry mechanism? If so how does it work?

  3. How effective is this with respect to software?
@JeanRochCoulon JeanRochCoulon added the notCV32A65X It is not an CV32A65X issue label Jan 29, 2025
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@JeanRochCoulon @Arhum-Ahmed