<html> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> <meta name="Generator" content="Microsoft Exchange Server">  <style></style> </head> <body> <font face="Calibri" size="2"><span style="font-size:10pt;"> <div style="padding-right:5pt;padding-left:5pt;"><font color="blue">[AMD Official Use Only - AMD Internal Distribution Only]<br> </font></div> <div style="margin-top:5pt;"><font face="Times New Roman" size="3"><span style="font-size:12pt;"><br> </span></font></div> <div><font face="Calibri" size="2"><span style="font-size:11pt;"><snipped></span></font></div> <div><font face="Calibri" size="2"><span style="font-size:11pt;"> </span></font></div> <div><font face="Calibri" size="2"><span style="font-size:11pt;">> > Some SOCs may only show upper-level caches here, therefore</span></font></div> <div><font face="Calibri" size="2"><span style="font-size:11pt;">> > cannot be use blindly without knowing the SOC.</span></font></div> <div><font face="Calibri" size="2"><span style="font-size:11pt;">> ></span></font></div> <div><font face="Calibri" size="2"><span style="font-size:11pt;">> > Can you please help us understand</span></font></div> <div><font face="Calibri" size="2"><span style="font-size:11pt;">> ></span></font></div> <div><font face="Calibri" size="2"><span style="font-size:11pt;">> </span></font></div> <div><font face="Calibri" size="2"><span style="font-size:11pt;">> For instance, in Neoverse N1 can disable the use of SLC as LLC (a BIOS setting)</span></font></div> <div><font face="Calibri" size="2"><span style="font-size:11pt;">> If SLC is not used as LLC, then your script would report the unified L2 as an LLC.</span></font></div> <div><font face="Calibri" size="2"><span style="font-size:11pt;"> </span></font></div> <div><font face="Calibri" size="2"><span style="font-size:11pt;">Does `disabling SLC as LLC` disable L3? I think not, and what you are implying is the `<font face="Consolas" size="2" color="#1B9D09"><span style="font-size:10pt;background-color:#EDFFED;"> </span></font>ls -d /sys/bus/cpu/devices/cpu%u/cache/index[0-9] | sort -r …… ` will return index2 and not index3. Is this the understanding? </span></font></div> <div><font face="Calibri" size="2"><span style="font-size:11pt;"> </span></font></div> <div><font face="Calibri" size="2"><span style="font-size:11pt;"> </span></font></div> <div><font face="Calibri" size="2"><span style="font-size:11pt;">> I don't think that's what you are interested in.</span></font></div> <div><font face="Calibri" size="2"><span style="font-size:11pt;">My intention as shared is to `whether BIOS setting for CPU NUMA is enabled or not, I would like to allow the end customer get the core complexes (tile) which are under one group`.</span></font></div> <div><font face="Calibri" size="2"><span style="font-size:11pt;">So, if the `Last Level Cache` is L3 or L2 seen by OS, API allows the end user to get DPDK lcores sharing the last level cache.</span></font></div> <div><font face="Calibri" size="2"><span style="font-size:11pt;"> </span></font></div> <div><font face="Calibri" size="2"><span style="font-size:11pt;">But as per the earlier communication, specific SoC does not behave when some setting are done different. For AMD SoC case we are trying to help end user with right setting with tuning guides as pointed by `<font face="Aptos" size="3"><span style="font-size:12pt;"> </span></font><a href="https://doc.dpdk.org/guides/linux_gsg/amd_platform.html"><font color="#467886"><u>12. How to get best performance on AMD platform — Data Plane Development Kit 24.11.0-rc0 documentation (dpdk.org)</u></font></a>`</span></font></div> <div><font face="Calibri" size="2"><span style="font-size:11pt;"> </span></font></div> <div><font face="Calibri" size="2"><span style="font-size:11pt;">Can you please confirm if such tuning guides or recommended settings are shared ? If not, can you please allow me to setup a technical call to sync on the same?</span></font></div> <div><font face="Calibri" size="2"><span style="font-size:11pt;"> </span></font></div> <div><font face="Calibri" size="2"><span style="font-size:11pt;">> </span></font></div> <div><font face="Calibri" size="2"><span style="font-size:11pt;">> > 1. if there are specific SoC which do not populate the information at</span></font></div> <div><font face="Calibri" size="2"><span style="font-size:11pt;">> > all? If yes are they in DTS?</span></font></div> <div><font face="Calibri" size="2"><span style="font-size:11pt;">> </span></font></div> <div><font face="Calibri" size="2"><span style="font-size:11pt;">> This information is populated correctly for all SOCs, comment was on the</span></font></div> <div><font face="Calibri" size="2"><span style="font-size:11pt;">> script.</span></font></div> <div><font face="Calibri" size="2"><span style="font-size:11pt;"> </span></font></div> <div><font face="Calibri" size="2"><span style="font-size:11pt;">Please note, I am not running any script. The command LCORE_GET_LLC is executed using C function `open`. As per suggestion of Stephen we have replied we will change to C function logic to get details.</span></font></div> <div><font face="Calibri" size="2"><span style="font-size:11pt;">Hope there is no longer confusion on this?</span></font></div> <div><font face="Calibri" size="2"><span style="font-size:11pt;"> </span></font></div> <div><font face="Calibri" size="2"><span style="font-size:11pt;"> </span></font></div> </span></font> </body> </html>