Linux network tuning: TCP BBR, NIC ring buffers, and SFTP throughput
SFTP capped at 800 KB/s on a Gbit link. CUBIC, default ring buffers, misconfigured socket buffers — five kernel and daemon tweaks that bring throughput from 800 KB/s to several MB/s.
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try { if(localStorage) { let currentUser = localStorage.getItem('current_user'); if (currentUser) { currentUser = JSON.parse(currentUser); if (currentUser.id === 3833552) { document.getElementById('article-show-container').classList.add('current-user-is-article-author'); } } } } catch (e) { console.error(e); } Odilon HUGONNOT Posted on May 1 • Originally published at web-developpeur.com Linux network tuning: TCP BBR, NIC ring buffers, and SFTP throughput #linux #tcp #bbr #sftp The server is on a Gbit link. ethtool confirms 1000 Mbps on the interface. And yet every SFTP transfer caps out somewhere around 800 KB/s. Not 80 MB/s — 800 kilobytes per second. Less than 1% of the theoretical capacity. The problem isn't bandwidth.
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