Understanding Server Upstream and Downstream Bandwidth: Why Uploads Can Slow Your Server
The article explains the difference between upstream and downstream bandwidth on a server, describes how most servers primarily use upstream for downloads, notes that downstream is used for uploads, and warns that POST uploads can consume memory and cause I/O slowdown when concurrency is high.
1. Upstream
It refers to the bandwidth flowing out of the server; when other machines download files from the server, they primarily use the server’s upstream bandwidth.
2. Downstream
It refers to the bandwidth flowing into the server; when other machines upload files to the server (e.g., via FTP), they primarily use the server’s downstream bandwidth. In most server usage scenarios, upstream bandwidth (downloading from the server) is used more frequently, while downstream (uploading to the server) is used less.
When uploading via POST, the file is read into the server’s memory; if the server has limited memory and many concurrent uploads occur, the server may run out of memory and resort to virtual memory or swap, significantly degrading I/O performance and causing the server to “slow down”.
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