From: bugzilla-daemon@kernel.org
To: linux-pm@vger.kernel.org
Subject: [Bug 218759] 6.9-rc kernels - with Ryzen 7840HS CPU single core never boosts to max frequency
Date: Thu, 25 Apr 2024 10:12:06 +0000 [thread overview]
Message-ID: <bug-218759-137361-elUO9ZYdPb@https.bugzilla.kernel.org/> (raw)
In-Reply-To: <bug-218759-137361@https.bugzilla.kernel.org/>
https://bugzilla.kernel.org/show_bug.cgi?id=218759
--- Comment #6 from Gaha (gahabana@gmail.com) ---
hi, I've applied patches to 6.9.0-rc5 and built kernel with those.
With kernel command line being either "passive", "guided" or "active" result is
the same - single core never goes above 4.35Ghz. with 6.8 kernel it does go all
the way to 5.1Ghz.
here is the output of lscpu -ae when running Geekbench (during single core
load) and it is the same with 'cat /dev/zero > /dev/null' . As for the 'tbench
-t 100 2' - on my ubuntu system tbench is part of diskbench. If you were
referring to tbench as part of kernel testing suite
(https://docs.kernel.org/6.8/admin-guide/pm/amd-pstate.html) - i tried building
it, it produces errors as scripts are looking for amd-pstate driver not
amd-pstate-epp driver etc...
However, am 100% certain that frequencies never boost above 4.35Ghz.(went back
to 6.8.7 kernel and all is good).
Here is the (hopefully useful output) showing that new 'cpp_boost' flag is
there etc as well as lspci -ae outputs during single core loading:
zh@muc:~/kselftest/amd-pstate$ cat /sys/devices/system/cpu/amd_pstate/cpb_boost
1
zh@muc:~/kselftest/amd-pstate$ cat
/sys/devices/system/cpu/cpufreq/policy0/scaling_driver
amd-pstate-epp
zh@muc:~$ lscpu -ae
CPU NODE SOCKET CORE L1d:L1i:L2:L3 ONLINE MAXMHZ MINMHZ MHZ
0 0 0 0 0:0:0:0 yes 4350.0000 400.0000 400.0000
1 0 0 1 1:1:1:0 yes 4350.0000 400.0000 4309.2700
2 0 0 2 2:2:2:0 yes 4350.0000 400.0000 2416.1770
3 0 0 3 3:3:3:0 yes 4350.0000 400.0000 400.0000
4 0 0 4 4:4:4:0 yes 4350.0000 400.0000 1722.2209
5 0 0 5 5:5:5:0 yes 4350.0000 400.0000 400.0000
6 0 0 6 6:6:6:0 yes 4350.0000 400.0000 400.0000
7 0 0 7 7:7:7:0 yes 4350.0000 400.0000 400.0000
8 0 0 0 0:0:0:0 yes 4350.0000 400.0000 1480.4850
9 0 0 1 1:1:1:0 yes 4350.0000 400.0000 4307.9858
10 0 0 2 2:2:2:0 yes 4350.0000 400.0000 1751.6750
11 0 0 3 3:3:3:0 yes 4350.0000 400.0000 1722.3180
12 0 0 4 4:4:4:0 yes 4350.0000 400.0000 400.0000
13 0 0 5 5:5:5:0 yes 4350.0000 400.0000 400.0000
14 0 0 6 6:6:6:0 yes 4350.0000 400.0000 400.0000
15 0 0 7 7:7:7:0 yes 4350.0000 400.0000 400.0000
Are there any other tests i could run to help figure out root cause of problem
with 6.9 kernel ?
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next prev parent reply other threads:[~2024-04-25 10:12 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-04-22 6:50 [Bug 218759] New: 6.9-rc kernels - with Ryzen 7840HS CPU single core never boosts to max frequency bugzilla-daemon
2024-04-22 6:54 ` [Bug 218759] " bugzilla-daemon
2024-04-22 8:12 ` bugzilla-daemon
2024-04-22 8:13 ` bugzilla-daemon
2024-04-22 10:15 ` bugzilla-daemon
2024-04-24 23:44 ` bugzilla-daemon
2024-04-25 0:39 ` bugzilla-daemon
2024-04-25 10:12 ` bugzilla-daemon [this message]
2024-04-25 15:21 ` bugzilla-daemon
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