On 2023-10-16, Comète <com...@geekandfree.org> wrote:
> Hello,
>
> I'm experiencing big slowdowns on a LENOVO Thinkpad T14 Gen3 when using MP
> kernel (on 7.3 and 7.4) but strangely not on GENERIC.
> For example, starting LibreOffice on GENERIC takes 7 seconds but 35 seconds
> on MP kernel. It's even lagging when typing some text in an editor or a mail.
> Switching to GENERIC and all is working as expected...
>
> Thanks for your help !
>
> Morgan
>
> This is my dmesg on both kernels:
>
>
> OpenBSD 7.4 (GENERIC) #1336: Tue Oct 10 08:52:22 MDT 2023
> dera...@amd64.openbsd.org:/usr/src/sys/arch/amd64/compile/GENERIC
> real mem = 34026549248 (32450MB)
> avail mem = 32975671296 (31448MB)
> random: good seed from bootblocks
> mpath0 at root
> scsibus0 at mpath0: 256 targets
> mainbus0 at root
> bios0 at mainbus0: SMBIOS rev. 3.4 @ 0x8f8a3000 (81 entries)
> bios0: vendor LENOVO version "N3MET16W (1.15 )" date 06/25/2023
No problem with MP here, but I have an older BIOS -
bios0 at mainbus0: SMBIOS rev. 3.4 @ 0x8d8a3000 (81 entries)
bios0: vendor LENOVO version "N3MET12W (1.11 )" date 02/09/2023
(grumble stupid US date format)
> bios0: LENOVO 21AHCTO1WW
> efi0 at bios0: UEFI 2.7
> efi0: Lenovo rev 0x1150
> acpi0 at bios0: ACPI 6.3
> acpi0: sleep states S0 S3 S4 S5
> acpi0: tables DSDT FACP SSDT SSDT SSDT SSDT SSDT TPM2 HPET APIC MCFG ECDT
> SSDT SSDT SSDT SSDT SSDT
> SSDT LPIT WSMT SSDT DBGP DBG2 NHLT MSDM SSDT BATB DMAR SSDT SSDT SSDT BGRT
> PHAT UEFI FPDT
> acpi0: wakeup devices PEG0(S4) PEGP(S4) PEGP(S4) PEG2(S4) PEGP(S4) GLAN(S4)
> XHCI(S3) XDCI(S4)
> HDAS(S4) CNVW(S4) RP01(S4) PXSX(S4) RP02(S4) PXSX(S4) RP03(S4) PXSX(S4) [...]
> acpitimer0 at acpi0: 3579545 Hz, 24 bits
> acpihpet0 at acpi0: 19200000 Hz
> acpimadt0 at acpi0 addr 0xfee00000: PC-AT compat
> cpu0 at mainbus0: apid 0 (boot processor)
> cpu0: 12th Gen Intel(R) Core(TM) i7-1260P, 2151.34 MHz, 06-9a-03, patch
> 0000042c
and different cpu:
cpu0: 12th Gen Intel(R) Core(TM) i5-1245U, 1568.55 MHz, 06-9a-04, patch 0000042c
FWIW I can definitely get mine to throttle when it's busy. And your
CPU uses a fair bit more power than mine (I specifically looked for a
U rather than a P cpu for exactly this reason) so I'd guess might be
easier to hit the throttle.
The OpenBSD kernel tries to set cpu clock speed high when on mains
power, so it might be worth trying unplugged to see if there's any
difference, or disable that thing with this
Index: sched_bsd.c
===================================================================
RCS file: /cvs/src/sys/kern/sched_bsd.c,v
retrieving revision 1.88
diff -u -p -r1.88 sched_bsd.c
--- sched_bsd.c 11 Oct 2023 15:42:44 -0000 1.88
+++ sched_bsd.c 17 Oct 2023 12:10:41 -0000
@@ -605,7 +605,7 @@ setperf_auto(void *v)
if (cpu_setperf == NULL)
return;
- if (hw_power) {
+ if (0 && hw_power) {
speedup = 1;
goto faster;
}
