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Bug
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Resolution: Duplicate
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None
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Minecraft 1.14.2
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None
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Host:
Debian 9.9 (stretch), vanilla with latest updates
Linux tochtli 4.9.0-9-amd64 #1 SMP Debian 4.9.168-1 (2019-04-12) x86_64 GNU/Linux
vendor_id : GenuineIntel
cpu family : 6
model : 60
model name : Intel(R) Xeon(R) CPU E3-1246 v3 @ 3.50GHz
stepping : 3
microcode : 0x25
cpu MHz : 3799.926
cache size : 8192 KB
physical id : 0
siblings : 4
core id : 0
cpu cores : 4
apicid : 0
initial apicid : 0
fpu : yes
fpu_exception : yes
cpuid level : 13
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx pdpe1gb rdtscp lm constant_tsc arch_perfmon pebs bts rep_good nopl xtopology nonstop_tsc aperfmperf pni pclmulqdq dtes64 monitor ds_cpl vmx smx est tm2 ssse3 sdbg fma cx16 xtpr pdcm pcid sse4_1 sse4_2 x2apic movbe popcnt tsc_deadline_timer aes xsave avx f16c rdrand lahf_lm abm epb invpcid_single ssbd ibrs ibpb stibp kaiser tpr_shadow vnmi flexpriority ept vpid fsgsbase tsc_adjust bmi1 avx2 smep bmi2 erms invpcid xsaveopt dtherm ida arat pln pts flush_l1d
bugs : cpu_meltdown spectre_v1 spectre_v2 spec_store_bypass l1tf
bogomips : 7000.16
clflush size : 64
cache_alignment : 64
address sizes : 39 bits physical, 48 bits virtual
power management:
Guest:
<domain type='kvm'>
<name>ontest</name>
<uuid>cb423de8-b80d-43b1-b92d-fb7da6f16cc1</uuid>
<title>Lee Test</title>
<memory unit='KiB'>10485760</memory>
<currentMemory unit='KiB'>10485760</currentMemory>
<vcpu placement='static' current='1'>2</vcpu>
<os>
<type arch='x86_64' machine='pc-i440fx-2.8'>hvm</type>
</os>
<features>
<acpi/>
<apic/>
<vmport state='off'/>
</features>
<cpu mode='host-model'>
<model fallback='allow'/>
<topology sockets='1' cores='2' threads='1'/>
</cpu>
<clock offset='utc'>
<timer name='rtc' tickpolicy='catchup'/>
<timer name='pit' tickpolicy='delay'/>
<timer name='hpet' present='no'/>
</clock>
<on_poweroff>destroy</on_poweroff>
<on_reboot>restart</on_reboot>
<on_crash>restart</on_crash>
<pm>
<suspend-to-mem enabled='no'/>
<suspend-to-disk enabled='no'/>
</pm>
<devices>
<emulator>/usr/bin/kvm</emulator>
<disk type='file' device='disk'>
<driver name='qemu' type='qcow2'/>
<source file='/u1/vm-storage-pools/default/ontest.qcow2'/>
<target dev='vda' bus='virtio'/>
<boot order='1'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x07' function='0x0'/>
</disk>
<disk type='file' device='cdrom'>
<driver name='qemu' type='raw'/>
<target dev='hda' bus='ide'/>
<readonly/>
<boot order='2'/>
<address type='drive' controller='0' bus='0' target='0' unit='0'/>
</disk>
<controller type='usb' index='0' model='ich9-ehci1'>
<address type='pci' domain='0x0000' bus='0x00' slot='0x05' function='0x7'/>
</controller>
<controller type='usb' index='0' model='ich9-uhci1'>
<master startport='0'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x05' function='0x0' multifunction='on'/>
</controller>
<controller type='usb' index='0' model='ich9-uhci2'>
<master startport='2'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x05' function='0x1'/>
</controller>
<controller type='usb' index='0' model='ich9-uhci3'>
<master startport='4'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x05' function='0x2'/>
</controller>
<controller type='pci' index='0' model='pci-root'/>
<controller type='ide' index='0'>
<address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x1'/>
</controller>
<controller type='virtio-serial' index='0'>
<address type='pci' domain='0x0000' bus='0x00' slot='0x06' function='0x0'/>
</controller>
<interface type='bridge'>
<mac address='52:54:00:6e:d6:53'/>
<source bridge='on0'/>
<model type='virtio'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/>
</interface>
<serial type='pty'>
<target port='0'/>
</serial>
<console type='pty'>
<target type='serial' port='0'/>
</console>
<channel type='unix'>
<target type='virtio' name='org.qemu.guest_agent.0'/>
<address type='virtio-serial' controller='0' bus='0' port='1'/>
</channel>
<channel type='spicevmc'>
<target type='virtio' name='com.redhat.spice.0'/>
<address type='virtio-serial' controller='0' bus='0' port='2'/>
</channel>
<input type='tablet' bus='usb'>
<address type='usb' bus='0' port='1'/>
</input>
<input type='mouse' bus='ps2'/>
<input type='keyboard' bus='ps2'/>
<graphics type='spice' autoport='yes'>
<listen type='address'/>
<image compression='off'/>
</graphics>
<sound model='ich6'>
<address type='pci' domain='0x0000' bus='0x00' slot='0x04' function='0x0'/>
</sound>
<video>
<model type='qxl' ram='65536' vram='65536' vgamem='16384' heads='1' primary='yes'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x0'/>
</video>
<redirdev bus='usb' type='spicevmc'>
<address type='usb' bus='0' port='2'/>
</redirdev>
<redirdev bus='usb' type='spicevmc'>
<address type='usb' bus='0' port='3'/>
</redirdev>
<memballoon model='virtio'>
<address type='pci' domain='0x0000' bus='0x00' slot='0x08' function='0x0'/>
</memballoon>
</devices>
</domain>
Java
openjdk 11.0.3 2019-04-16
OpenJDK Runtime Environment (build 11.0.3+1-Debian-1)
OpenJDK 64-Bit Server VM (build 11.0.3+1-Debian-1, mixed mode, sharing)
....or
java 11.0.3 2019-04-16 LTS
Java(TM) SE Runtime Environment 18.9 (build 11.0.3+12-LTS)
Java HotSpot(TM) 64-Bit Server VM 18.9 (build 11.0.3+12-LTS, mixed mode)
Host: Debian 9.9 (stretch), vanilla with latest updates Linux tochtli 4.9.0-9-amd64 #1 SMP Debian 4.9.168-1 (2019-04-12) x86_64 GNU/Linux vendor_id : GenuineIntel cpu family : 6 model : 60 model name : Intel(R) Xeon(R) CPU E3-1246 v3 @ 3.50GHz stepping : 3 microcode : 0x25 cpu MHz : 3799.926 cache size : 8192 KB physical id : 0 siblings : 4 core id : 0 cpu cores : 4 apicid : 0 initial apicid : 0 fpu : yes fpu_exception : yes cpuid level : 13 wp : yes flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx pdpe1gb rdtscp lm constant_tsc arch_perfmon pebs bts rep_good nopl xtopology nonstop_tsc aperfmperf pni pclmulqdq dtes64 monitor ds_cpl vmx smx est tm2 ssse3 sdbg fma cx16 xtpr pdcm pcid sse4_1 sse4_2 x2apic movbe popcnt tsc_deadline_timer aes xsave avx f16c rdrand lahf_lm abm epb invpcid_single ssbd ibrs ibpb stibp kaiser tpr_shadow vnmi flexpriority ept vpid fsgsbase tsc_adjust bmi1 avx2 smep bmi2 erms invpcid xsaveopt dtherm ida arat pln pts flush_l1d bugs : cpu_meltdown spectre_v1 spectre_v2 spec_store_bypass l1tf bogomips : 7000.16 clflush size : 64 cache_alignment : 64 address sizes : 39 bits physical, 48 bits virtual power management: Guest: <domain type='kvm'> <name>ontest</name> <uuid>cb423de8-b80d-43b1-b92d-fb7da6f16cc1</uuid> <title>Lee Test</title> <memory unit='KiB'>10485760</memory> <currentMemory unit='KiB'>10485760</currentMemory> <vcpu placement='static' current='1'>2</vcpu> <os> <type arch='x86_64' machine='pc-i440fx-2.8'>hvm</type> </os> <features> <acpi/> <apic/> <vmport state='off'/> </features> <cpu mode='host-model'> <model fallback='allow'/> <topology sockets='1' cores='2' threads='1'/> </cpu> <clock offset='utc'> <timer name='rtc' tickpolicy='catchup'/> <timer name='pit' tickpolicy='delay'/> <timer name='hpet' present='no'/> </clock> <on_poweroff>destroy</on_poweroff> <on_reboot>restart</on_reboot> <on_crash>restart</on_crash> <pm> <suspend-to-mem enabled='no'/> <suspend-to-disk enabled='no'/> </pm> <devices> <emulator>/usr/bin/kvm</emulator> <disk type='file' device='disk'> <driver name='qemu' type='qcow2'/> <source file='/u1/vm-storage-pools/default/ontest.qcow2'/> <target dev='vda' bus='virtio'/> <boot order='1'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x07' function='0x0'/> </disk> <disk type='file' device='cdrom'> <driver name='qemu' type='raw'/> <target dev='hda' bus='ide'/> <readonly/> <boot order='2'/> <address type='drive' controller='0' bus='0' target='0' unit='0'/> </disk> <controller type='usb' index='0' model='ich9-ehci1'> <address type='pci' domain='0x0000' bus='0x00' slot='0x05' function='0x7'/> </controller> <controller type='usb' index='0' model='ich9-uhci1'> <master startport='0'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x05' function='0x0' multifunction='on'/> </controller> <controller type='usb' index='0' model='ich9-uhci2'> <master startport='2'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x05' function='0x1'/> </controller> <controller type='usb' index='0' model='ich9-uhci3'> <master startport='4'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x05' function='0x2'/> </controller> <controller type='pci' index='0' model='pci-root'/> <controller type='ide' index='0'> <address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x1'/> </controller> <controller type='virtio-serial' index='0'> <address type='pci' domain='0x0000' bus='0x00' slot='0x06' function='0x0'/> </controller> <interface type='bridge'> <mac address='52:54:00:6e:d6:53'/> <source bridge='on0'/> <model type='virtio'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/> </interface> <serial type='pty'> <target port='0'/> </serial> <console type='pty'> <target type='serial' port='0'/> </console> <channel type='unix'> <target type='virtio' name='org.qemu.guest_agent.0'/> <address type='virtio-serial' controller='0' bus='0' port='1'/> </channel> <channel type='spicevmc'> <target type='virtio' name='com.redhat.spice.0'/> <address type='virtio-serial' controller='0' bus='0' port='2'/> </channel> <input type='tablet' bus='usb'> <address type='usb' bus='0' port='1'/> </input> <input type='mouse' bus='ps2'/> <input type='keyboard' bus='ps2'/> <graphics type='spice' autoport='yes'> <listen type='address'/> <image compression='off'/> </graphics> <sound model='ich6'> <address type='pci' domain='0x0000' bus='0x00' slot='0x04' function='0x0'/> </sound> <video> <model type='qxl' ram='65536' vram='65536' vgamem='16384' heads='1' primary='yes'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x0'/> </video> <redirdev bus='usb' type='spicevmc'> <address type='usb' bus='0' port='2'/> </redirdev> <redirdev bus='usb' type='spicevmc'> <address type='usb' bus='0' port='3'/> </redirdev> <memballoon model='virtio'> <address type='pci' domain='0x0000' bus='0x00' slot='0x08' function='0x0'/> </memballoon> </devices> </domain> Java openjdk 11.0.3 2019-04-16 OpenJDK Runtime Environment (build 11.0.3+1-Debian-1) OpenJDK 64-Bit Server VM (build 11.0.3+1-Debian-1, mixed mode, sharing) ....or java 11.0.3 2019-04-16 LTS Java(TM) SE Runtime Environment 18.9 (build 11.0.3+12-LTS) Java HotSpot(TM) 64-Bit Server VM 18.9 (build 11.0.3+12-LTS, mixed mode)
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Unconfirmed
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(Unassigned)
Running the 1.14.2 jar in a Debian 9.9 or 10 guest uses 100% of a core on the host when idle, with no players. With players, it uses at least 100% of a core. A `top' on the guest indicates the running server is using 6 to 8 percent of the vCPU.
/proc/interrupts shows the local timer interrupts increasing at around 180K/sec on the guest and host.
To reproduce:
1) On a Debian 9.9 system, craft a qemu-kvm guest with sufficient memory and disk
2) Download the 1.14.2 jar, start it with the flags given on the download page
3) Wait for the world to be created
4) Enjoy the "can't keep up" messages.
Profiling with visualvm seems to indicate a large majority of the time is spent in netty/epoll-wait. Really, like, almost all...
An strace, on the guest, of the most active thread just pours out the following:
futex(0x7f5be0a2d468, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=733}) = -1 ETIMEDOUT (Connection timed out)
futex(0x7f5be0a2d418, FUTEX_WAKE_PRIVATE, 1) = 0
futex(0x7f5be0a2d468, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=724}) = -1 ETIMEDOUT (Connection timed out)
futex(0x7f5be0a2d418, FUTEX_WAKE_PRIVATE, 1) = 0
futex(0x7f5be0a2d468, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=753}) = -1 ETIMEDOUT (Connection timed out)
futex(0x7f5be0a2d418, FUTEX_WAKE_PRIVATE, 1) = 0
futex(0x7f5be0a2d468, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=742}) = -1 ETIMEDOUT (Connection timed out)
futex(0x7f5be0a2d418, FUTEX_WAKE_PRIVATE, 1) = 0
futex(0x7f5be0a2d468, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=669}) = -1 ETIMEDOUT (Connection timed out)
futex(0x7f5be0a2d418, FUTEX_WAKE_PRIVATE, 1) = 0
futex(0x7f5be0a2d468, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=710}) = -1 ETIMEDOUT (Connection timed out)
futex(0x7f5be0a2d418, FUTEX_WAKE_PRIVATE, 1) = 0
futex(0x7f5be0a2d468, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=743}) = -1 ETIMEDOUT (Connection timed out)
futex(0x7f5be0a2d418, FUTEX_WAKE_PRIVATE, 1) = 0
futex(0x7f5be0a2d468, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=700}) = -1 ETIMEDOUT (Connection timed out)
futex(0x7f5be0a2d418, FUTEX_WAKE_PRIVATE, 1) = 0
futex(0x7f5be0a2d468, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=736}) = -1 ETIMEDOUT (Connection timed out)
futex(0x7f5be0a2d418, FUTEX_WAKE_PRIVATE, 1) = 0
futex(0x7f5be0a2d468, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=729}) = -1 ETIMEDOUT (Connection timed out)
futex(0x7f5be0a2d418, FUTEX_WAKE_PRIVATE, 1) = 0
futex(0x7f5be0a2d468, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=710}) = -1 ETIMEDOUT (Connection timed out)
Seems a rather short time to wait...
On the host side, the qemu-kvm profiling seems to indicate that the guest thread is spending all of it's time servicing timer interrupts.
- duplicates
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- Resolved