Re: [RFC PATCH v3 01/13] lib/sbm: Introduce helpers for architectures to configure LLC properties

Hello Shrikanth,

On 10/7/2026 11:13 AM, Shrikanth Hegde wrote:

Hi Prateek.

I ran the series on 320 CPU power11 system today.
hackbench shows high regression across the different number of groups and
it is more severe at lower number of groups. I haven't run anything else yet.

I haven't taken a look at the patches yet. Post your talk today will try to
go through and see if i can spot something.

Thanks a ton for the testing. Now that I'm back, I'll take a look at
few bits again, especially stuff for optimizing traversals. 

Can you please share what does your system topology look like and what
did:

  sudo dmesg | grep sbm

say when you booted into your kernel?

quoted

+void __init sbm_set_topology(int num_instances, int max_threads_per_instance)
+{
+    sbm_max_threads_per_instance = max_threads_per_instance;
+    sbm_num_instance = num_instances;
+
+    pr_info("sbm topology set to %d instance(s) with a maximum of %d thread(s) per instance\n",
+        sbm_num_instance,
+        sbm_max_threads_per_instance);
+}

nit: Stray empty line at the end.

Ack! Thank you again for taking a look.

quoted

+

-- 
Thanks and Regards,
Prateek