I do not know any particular issues with FQ in VM If you have a recent tc binary (iproute2 package) you can get some infos, as mentioned in this commit changelog :
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=fefa569a9d4bc4b7758c0fddd75bb0382c95da77 $ tc -s qd sh dev eth0 | grep latency 0 gc, 0 highprio, 32490767 throttled, 2382 ns latency On Wed, 2017-01-25 at 22:31 +0100, Hans-Kristian Bakke wrote: > kvm-clock is a paravirtualized clock that seems to use the CPUs TSC > capabilities if they exist. But it may not be perfect: > > > https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/6/html/Virtualization_Host_Configuration_and_Guest_Installation_Guide/chap-Virtualization_Host_Configuration_and_Guest_Installation_Guide-KVM_guest_timing_management.html > > > On 25 January 2017 at 22:29, Hans-Kristian Bakke <hkba...@gmail.com> > wrote: > Actually I think that is because it may be using the newer > TSC: > dmesg | grep clocksource > [ 0.000000] clocksource: kvm-clock: mask: > 0xffffffffffffffff max_cycles: 0x1cd42e4dffb, max_idle_ns: > 881590591483 ns > [ 0.000000] clocksource: refined-jiffies: mask: 0xffffffff > max_cycles: 0xffffffff, max_idle_ns: 7645519600211568 ns > [ 0.000000] clocksource: hpet: mask: 0xffffffff max_cycles: > 0xffffffff, max_idle_ns: 19112604467 ns > [ 0.092665] clocksource: jiffies: mask: 0xffffffff > max_cycles: 0xffffffff, max_idle_ns: 7645041785100000 ns > [ 0.366429] clocksource: Switched to clocksource kvm-clock > [ 0.378974] clocksource: acpi_pm: mask: 0xffffff > max_cycles: 0xffffff, max_idle_ns: 2085701024 ns > [ 1.666474] tsc: Refined TSC clocksource calibration: > 3200.013 MHz > [ 1.666479] clocksource: tsc: mask: 0xffffffffffffffff > max_cycles: 0x2e20562a1bb, max_idle_ns: 440795285529 ns > > > > On 25 January 2017 at 22:26, Jonathan Morton > <chromati...@gmail.com> wrote: > > > On 25 Jan, 2017, at 23:20, Hans-Kristian Bakke > <hkba...@gmail.com> wrote: > > > > [ 0.000000] ACPI: HPET 0x00000000BFFE274F 000038 > (v01 BOCHS BXPCHPET 00000001 BXPC 00000001) > > [ 0.000000] ACPI: HPET id: 0x8086a201 base: > 0xfed00000 > > [ 0.000000] clocksource: hpet: mask: 0xffffffff > max_cycles: 0xffffffff, max_idle_ns: 19112604467 ns > > [ 0.000000] hpet clockevent registered > > [ 0.362335] hpet0: at MMIO 0xfed00000, IRQs 2, 8, > 0 > > [ 0.362339] hpet0: 3 comparators, 64-bit > 100.000000 MHz counter > > [ 0.661731] rtc_cmos 00:00: alarms up to one day, > y3k, 114 bytes nvram, hpet irqs > > Conspicuously absent here is a line saying > “clocksource: Switched to clocksource hpet”. That may > be worth examining in more detail. > > - Jonathan Morton > > > > > > _______________________________________________ > Bloat mailing list > Bloat@lists.bufferbloat.net > https://lists.bufferbloat.net/listinfo/bloat _______________________________________________ Bloat mailing list Bloat@lists.bufferbloat.net https://lists.bufferbloat.net/listinfo/bloat