Scott Cheloha <scottchel...@gmail.com> [2022-09-23, 14:51 -0500]: > On Fri, Sep 23, 2022 at 10:40:19PM +0300, Timo Myyr?? wrote: > >> Scott Cheloha <scottchel...@gmail.com> [2022-09-23, 09:16 -0500]: >> >> > [...] >> > >> > Test results? Clues on reading the configuration space? >> > >> > [...] >> >> Hi, >> >> Here's a dmesg from thinkpad e485: > > Thanks for testing. > >> Does these timers affect the booting of kernel? Once I select the kernel >> to boot by pressing enter on "bsd>" line, the boot process takes about >> 18s to proceed from the "booting sr0a:/bsd". > > The patch reads a couple MSRs and prints ~10 additional lines during > boot from the primary CPU. The computed TSC frequency is not used by > the kernel, only printed so I can check whether my code is correct. > > It should have zero impact on the length of the boot. It should not > change any runtime behavior whatsoever. > > Your boot probably should not be taking that long, but I can't imagine > how my patch would cause such a dramatic change. > > If you reverse the patch, what happens? >
I haven't been keeping track of boot times but I doubt it is new issue with this laptop. Current cold boot seemed to pass the "counters" part in about 5s so it varies a bit. I'll see if I find the time to dig through the code to see what boot process is actually doing at that point. >> OpenBSD 7.2 (GENERIC.MP) #20: Fri Sep 23 22:27:31 EEST 2022 >> t...@asteroid.bittivirhe.fi:/usr/src/sys/arch/amd64/compile/GENERIC.MP >> [...] >> cpu0 at mainbus0: apid 0 (boot processor) >> cpu0: MSR C001_0064: en 1 base 200000000 mul 100 div 10 freq 2000000000 Hz >> cpu0: MSR C001_0065: en 1 base 200000000 mul 102 div 12 freq 1700000000 Hz >> cpu0: MSR C001_0066: en 1 base 200000000 mul 96 div 12 freq 1600000000 Hz >> cpu0: MSR C001_0067: en 0 >> cpu0: MSR C001_0068: en 0 >> cpu0: MSR C001_0069: en 0 >> cpu0: MSR C001_006A: en 0 >> cpu0: MSR C001_006B: en 0 >> cpu0: AMD Ryzen 5 2500U with Radeon Vega Mobile Gfx, 1996.30 MHz, 17-11-00 >> cpu0: >> FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CFLUSH,MMX,FXSR,SSE,SSE2,HTT,SSE3,PCLMUL,MWAIT,SSSE3,FMA3,CX16,SSE4.1,SSE4.2,MOVBE,POPCNT,AES,XSAVE,AVX,F16C,RDRAND,NXE,MMXX,FFXSR,PAGE1GB,RDTSCP,LONG,LAHF,CMPLEG,SVM,EAPICSP,AMCR8,ABM,SSE4A,MASSE,3DNOWP,OSVW,SKINIT,TCE,TOPEXT,CPCTR,DBKP,PCTRL3,MWAITX,ITSC,FSGSBASE,BMI1,AVX2,SMEP,BMI2,RDSEED,ADX,SMAP,CLFLUSHOPT,SHA,IBPB,XSAVEOPT,XSAVEC,XGETBV1,XSAVES >> cpu0: 32KB 64b/line 8-way D-cache, 64KB 64b/line 4-way I-cache, 512KB >> 64b/line 8-way L2 cache, 4MB 64b/line 16-way L3 cache >> tsc: calibrating with acpihpet0: 1996264149 Hz > > Your family 17h CPU has a computed P0 frequency of 2000MHz. The > calibrated TSC frequency is 1996264149 Hz. > > That seems right to me, thank you for testing.
