Date: Fri, 10 Sep 2021 18:17:58 +0000 From: bugzilla-noreply@freebsd.org To: virtualization@FreeBSD.org Subject: [Bug 256781] EC2 Nitro: TSC-low timecounter lags Message-ID: <bug-256781-27103-HLaUBs0NkZ@https.bugs.freebsd.org/bugzilla/> In-Reply-To: <bug-256781-27103@https.bugs.freebsd.org/bugzilla/> References: <bug-256781-27103@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D256781 --- Comment #29 from martin.stoyanov@vertalo.com --- (In reply to Colin Percival from comment #27) Setting kvmclock seems to work as expected: root@freebsd:~ # sysctl kern.timecounter.hardware=3Dkvmclock kern.timecounter.hardware: TSC-low -> kvmclock root@freebsd:~ # date Fri Sep 10 18:07:12 UTC 2021 root@freebsd:~ # sysctl kern.timecounter kern.timecounter.tsc_shift: 1 kern.timecounter.smp_tsc_adjust: 0 kern.timecounter.smp_tsc: 1 kern.timecounter.invariant_tsc: 1 kern.timecounter.fast_gettime: 1 kern.timecounter.tick: 1 kern.timecounter.choice: i8254(0) ACPI-fast(900) HPET(950) kvmclock(975) TSC-low(1000) dummy(-1000000) kern.timecounter.hardware: kvmclock kern.timecounter.alloweddeviation: 5 kern.timecounter.timehands_count: 2 kern.timecounter.stepwarnings: 0 kern.timecounter.tc.i8254.quality: 0 kern.timecounter.tc.i8254.frequency: 1193182 kern.timecounter.tc.i8254.counter: 25411 kern.timecounter.tc.i8254.mask: 65535 kern.timecounter.tc.ACPI-fast.quality: 900 kern.timecounter.tc.ACPI-fast.frequency: 3579545 kern.timecounter.tc.ACPI-fast.counter: 5485062 kern.timecounter.tc.ACPI-fast.mask: 16777215 kern.timecounter.tc.HPET.quality: 950 kern.timecounter.tc.HPET.frequency: 62500000 kern.timecounter.tc.HPET.counter: 3218406757 kern.timecounter.tc.HPET.mask: 4294967295 kern.timecounter.tc.kvmclock.quality: 975 kern.timecounter.tc.kvmclock.frequency: 1000000000 kern.timecounter.tc.kvmclock.counter: 2954620152 kern.timecounter.tc.kvmclock.mask: 4294967295 kern.timecounter.tc.TSC-low.quality: 1000 kern.timecounter.tc.TSC-low.frequency: 1100021373 kern.timecounter.tc.TSC-low.counter: 2772787131 kern.timecounter.tc.TSC-low.mask: 4294967295 root@freebsd:~ # date Fri Sep 10 18:08:06 UTC 2021 However I am not able to reproduce the original issue with this instance - TSC-low seems to be working fine as well... Please let me know if you need anything else or if I can run more tests... --=20 You are receiving this mail because: You are the assignee for the bug.=
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