The trick to improving jitter and latency

When using NFS (Network File System) to share files over a network, there are several tricks and optimizations you can apply to improve latency and reduce jitter. Here are some suggestions:

Use a high-performance server and network: The performance of the NFS server, as well as the network infrastructure, plays a significant role in determining NFS latency and jitter. Utilize high-performance server hardware and Gigabit or faster network connections to minimize latency. Additionally, consider using a dedicated network for NFS traffic, if possible.

Choose the right NFS version: NFSv4 generally offers better performance and security features compared to NFSv3. If your server and client support NFSv4, consider using it.

Optimize NFS mount options: When mounting an NFS share, you can use various options to optimize performance:

rsize and wsize: These options set the read and write buffer sizes, respectively. Larger buffer sizes can improve performance, but may also increase latency. Consider setting them to match your network's Maximum Transmission Unit (MTU) size or use the default values provided by your NFS client.

Example:

sudo mount -t nfs -o rsize=32768,wsize=32768 server:/path/to/share /mnt/nfs_share

noatime or relatime: These options reduce filesystem overhead by disabling or limiting access time updates. Add these options to the mount command:

Example:

sudo mount -t nfs -o noatime,relatime server:/path/to/share /mnt/nfs_share

nfsvers: Specify the NFS version to use when mounting the share. For instance, to use NFSv4:

Example:

sudo mount -t nfs -o nfsvers=4 server:/path/to/share /mnt/nfs_share

Use UDP or TCP depending on your use case: NFS can use either UDP (User Datagram Protocol) or TCP (Transmission Control Protocol) for communication. UDP is generally faster and has less overhead, but it doesn't guarantee packet delivery, which could lead to increased jitter. TCP, on the other hand, provides better reliability but may have slightly higher latency. Depending on your requirements, you can choose the appropriate protocol by using the proto mount option:

For UDP:

sudo mount -t nfs -o proto=udp server:/path/to/share /mnt/nfs_share

For TCP:

sudo mount -t nfs -o proto=tcp server:/path/to/share /mnt/nfs_share

Tune kernel parameters: You can adjust certain kernel parameters to improve NFS performance. For example, you can increase the number of NFS threads on the server by modifying the rpc.nfsd value in /etc/sysctl.conf:

rpc.nfsd.threads = 16
```

You can also adjust the number of RPC (Remote Procedure Call) server threads by modifying the `rpc_sv_max` value in `/etc/nfs.conf`:

````
[nfsd]
threads = 16
````

Apply the changes by running `sudo sysctl -p` and restarting the NFS server.

Disable unnecessary services: Ensure that the NFS server is not running any unnecessary services or applications, which may consume CPU or network resources.

Monitor and optimize: Continuously monitor the performance of your NFS server and network using tools like nfsiostat, iostat, and iftop. Identify and resolve any performance bottlenecks.

Keep in mind that the effectiveness of these optimizations may vary depending on your specific network, hardware, and software configurations. It's crucial to test different settings and parameters to find the most suitable configuration for your environment.

The ultimate version for now

server:/path/to/nfs /mount/point/on/local nfs ro,noatime,nodiratime,rsize=1048576,_netdev 0 0