Unexpected realtime delay on task 0 with period 1000000

CPU Configuration

Hyper-Threading [Disable]
Active Processor Cores [All]
Intel Virtualization Technology [Disable]
VT-d [Disable]
Enhanced SpeedStep [Disable]
Turbo Mode [Disable]
Package C State limit [C0]

# If you change this file, run 'update-grub' afterwards to update
# /boot/grub/grub.cfg.
# For full documentation of the options in this file, see:
# info -f grub -n 'Simple configuration'

GRUB_DEFAULT=0
GRUB_TIMEOUT=5
GRUB_DISTRIBUTOR=`lsb_release -i -s 2> /dev/null || echo Debian`
# GRUB_CMDLINE_LINUX_DEFAULT="quiet"
GRUB_CMDLINE_LINUX_DEFAULT="quiet, isolcpus=2,3"
GRUB_CMDLINE_LINUX="-1"

# If your computer has multiple operating systems installed, then you
# probably want to run os-prober. However, if your computer is a host
# for guest OSes installed via LVM or raw disk devices, running
# os-prober can cause damage to those guest OSes as it mounts
# filesystems to look for things.
#GRUB_DISABLE_OS_PROBER=false

# Uncomment to enable BadRAM filtering, modify to suit your needs
# This works with Linux (no patch required) and with any kernel that obtains
# the memory map information from GRUB (GNU Mach, kernel of FreeBSD ...)
#GRUB_BADRAM="0x01234567,0xfefefefe,0x89abcdef,0xefefefef"

# Uncomment to disable graphical terminal
#GRUB_TERMINAL=console

# The resolution used on graphical terminal
# note that you can use only modes which your graphic card supports via VBE
# you can see them in real GRUB with the command `vbeinfo'
#GRUB_GFXMODE=640x480

# Uncomment if you don't want GRUB to pass "root=UUID=xxx" parameter to Linux
#GRUB_DISABLE_LINUX_UUID=true

# Uncomment to disable generation of recovery mode menu entries
#GRUB_DISABLE_RECOVERY="true"

# Uncomment to get a beep at grub start
#GRUB_INIT_TUNE="480 440 1"

$ ping 10.0.0.10
PING 10.0.0.10 (10.0.0.10) 56(84) bytes of data.
From 62.155.245.22 icmp_seq=1 Destination Net Unreachable
From 62.155.245.22 icmp_seq=2 Destination Net Unreachable
From 62.155.245.22 icmp_seq=3 Destination Net Unreachable
From 62.155.245.22 icmp_seq=4 Destination Net Unreachable
From 62.155.245.22 icmp_seq=5 Destination Net Unreachable
...

PING 192.168.1.121 (192.168.1.121) 56(84) bytes of data.
64 bytes from 192.168.1.121: icmp_seq=1 ttl=64 time=0.290 ms
64 bytes from 192.168.1.121: icmp_seq=2 ttl=64 time=0.212 ms
64 bytes from 192.168.1.121: icmp_seq=3 ttl=64 time=0.200 ms
64 bytes from 192.168.1.121: icmp_seq=4 ttl=64 time=0.206 ms
64 bytes from 192.168.1.121: icmp_seq=5 ttl=64 time=0.197 ms
64 bytes from 192.168.1.121: icmp_seq=6 ttl=64 time=0.182 ms
64 bytes from 192.168.1.121: icmp_seq=7 ttl=64 time=0.153 ms
64 bytes from 192.168.1.121: icmp_seq=8 ttl=64 time=0.173 ms
64 bytes from 192.168.1.121: icmp_seq=9 ttl=64 time=0.200 ms
64 bytes from 192.168.1.121: icmp_seq=10 ttl=64 time=0.104 ms
64 bytes from 192.168.1.121: icmp_seq=11 ttl=64 time=0.192 ms

1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host noprefixroute
       valid_lft forever preferred_lft forever
2: enp1s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP group default qlen 1000
    link/ether 90:1b:0e:c4:87:3a brd ff:ff:ff:ff:ff:ff
    inet 192.168.1.10/24 brd 192.168.1.255 scope global noprefixroute enp1s0
       valid_lft forever preferred_lft forever
3: enp2s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP group default qlen 1000
    link/ether 08:be:ac:22:81:a7 brd ff:ff:ff:ff:ff:ff
    inet 192.168.178.42/24 brd 192.168.178.255 scope global dynamic noprefixroute enp2s0
       valid_lft 859212sec preferred_lft 859212sec
    inet6 2003:c6:373c:ff00:82e1:342e:6b12:e13d/64 scope global temporary dynamic
       valid_lft 7103sec preferred_lft 1116sec
    inet6 2003:c6:373c:ff00:b318:95ce:c8b7:72c/64 scope global dynamic mngtmpaddr noprefixroute
       valid_lft 7103sec preferred_lft 1116sec
    inet6 fe80::1c94:bea2:1ecf:4563/64 scope link noprefixroute
       valid_lft forever preferred_lft forever