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free -tm: used < buffers+cache. What should be actual used memory?

User_FYUBPJul 14 2022

Hi all,
On Linux 8.6. As far as I understand from various document using "free -tm", used memory = used - buffers - cached.
However, looking at the stats, used < (buffers + cached) i.e. 510 - 532 = -22 and is incorrect.
Please advise what is the actual used memory?
[root@linux8 ~]# free -tm
total used free shared buff/cache available
Mem: 11429 510 10387 10 532 10766 <-- used=510, buff/cache=532
Swap: 23840 0 23840
Total: 35270 510 34228
Thanks
happy

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Added on Jul 14 2022
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