Windows High DPC % Usage

[itNGO]

Hi,
we are investigating an ongoing issue on several Windows Servers (2016).

Over time, after keeping the system several days without reboot DPC % Interrupt time is getting to horrible high values.
With LatencyMon we can see that primary NDIS.SYS (Network) and partial ataport.sys is having high DPC routine execution time.

Normal suggestion at first is to update drivers, however Virtio-Drivers are latest.

This issue does come to the point where the System is unusable after some days and has to be rebooted.

Any suggestion how to solve this? Maybe an offload-setting in the VirtIO Nic driver?

 

[itNGO]

Anyone?

 

[dcsapak]

without any further information it's hard to say what exactly is the problem here..

can you post the vm config?

 

[itNGO]

without any further information it's hard to say what exactly is the problem here..

can you post the vm config?

Sure:

agent: 1
bios: ovmf
boot: order=scsi0;net0
cores: 4
cpu: host,flags=+pdpe1gb;+hv-tlbflush;+aes
cpulimit: 4
efidisk0: APVE_NVME:vm-255016004-disk-0,size=1M
machine: pc-q35-6.0
memory: 24576
name: *removed*
net0: virtio=C6:A5:0A:E6:96:71,bridge=vmbr0,tag=16
numa: 1
ostype: win10
scsi0: APVE_NVME:vm-255016004-disk-1,cache=writeback,discard=on,size=90G,ssd=1
scsi1: APVE_NVME:vm-255016004-disk-2,cache=writeback,discard=on,size=200G,ssd=1
scsihw: virtio-scsi-pci
smbios1: uuid=bbf20411-a450-45a2-9f19-acc9a7134021
sockets: 1
tablet: 1
vga: virtio
vmgenid: 2c054a50-47cd-49e1-81f7-719ab0e9a7d8

 

[marcosscriven]

Sorry to bring up the old thread, but did you find the solution here? Your post is the top result for "ndis.sys" on here.

 

[itNGO]

Sorry to bring up the old thread, but did you find the solution here? Your post is the top result for "ndis.sys" on here.

Yes it is mostly gone after latest VirtIO drivers and latest Windows Updates. Also PVE 8/8.1 helped a lot with this... Newer KVM I guess....