rwhitworth

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rwhitworth

Only listing the families and types that affect my professional environment.

Accelerated Computing, Storage Optimized, and all AMD EPYC groups left to the reader to investigate.

CPU type data sourced from https://aws.amazon.com/ec2/instance-types/

Some EC2 instance types use different CPUs for the same instance type. T3 is an example. Without checking each host I do not know how to determine which CPU type it will have. Assume all T3 instances need to be patched.

T2:
Not affected

rwhitworth

sudo apt-get update

# install hyper-v tools
sudo apt-get install -y hyperv-daemons
for i in fcopy kvp vss ; do sudo systemctl start hv-$i-daemon ; systemctl status hv-$i-daemon ; done

# change linux scheduler to allow hyper-v to control things, which is more efficient for host, especially on SSD storage
sudo sed -i 's/DEFAULT="quiet"/DEFAULT="quiet scheduler=noop"/g' /etc/default/grub
sudo update-grub2

rwhitworth

Latency Comparison Numbers
--------------------------
L1 cache reference                            0.5 ns
Branch mispredict                             5   ns
L2 cache reference                            7   ns             14x L1 cache
Mutex lock/unlock                            25   ns
Main memory reference                       100   ns             20x L2 cache, 200x L1 cache
Compress 1K bytes with Zippy              3,000   ns
Send 1K bytes over 1 Gbps network        10,000   ns    0.01 ms
Read 4K randomly from SSD*              150,000   ns    0.15 ms