[PLRU Issue] In case of CMO_PREFETCH plru behaves differently in case if HIT or MISS

[khandelwaltanuj]

Hello,

Following observation are made in the case of CMO_PREFETCH (prefetch_updt_plru == 1)

1. in case of hit PLRU is not updated
2. in case of miss PLRU is updated once the read memory response is received.

This seems inconsistant. Can you please take a look at it ?

Thanks and regards
Tanuj Khandelwal

[khandelwaltanuj]

Hi @cfuguet

Do you have any update on this ?

Thanks and Regards
Tanuj Khandelwal

[cfuguet]

Hello @khandelwaltanuj,

I forgot about this one. Yes, this should be fixed. I will do it.

The fix will do the following:

• In case of PREFETCH hit, the PLRU is updated if prefetch_updt_plru == 1
• In case of PREFETCH miss, the PLRU is updated at refill time if prefetch_updt_plru == 1

Thanks for spotting this out

[cfuguet]

Fixed in commit ab4b7ea

Let me know if this fixes the issue you are seeing in the UVM testbench. If it does, please you can close this issue.

Cheers !

[khandelwaltanuj]

Hi @cfuguet

This fix is working in my regression. I am keeping it open, as I am not able to merge the new version to TB yet.

Regards
Tanuj Khandelwal