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| 2020-01-03 | 2020-01-03 | ||
| Adding information from https://serverfault.com/q/694062/168875#694063 + structure + raw session settings (martin) | fix the link (martin) | ||
| Line 20: | Line 20: | ||
| Most SFTP clients (including WinSCP) overcome the problem by both requesting/sending a large chunk of the file in each single read/write request and by sending (queuing) multiple requests without waiting for a response to previous. For example WinSCP can request up to 32 chunks for 32 KB each at once, totaling 1 MB (these are defaults which can be altered with ''SFTPDownloadQueue'' and ''SFTPUploadQueue'' [[rawsettings|raw session settings]]). But if there's a big discrepancy between the bandwidth and the network delay, even that 1 MB can be too small to saturate the bandwidth. | Most SFTP clients (including WinSCP) overcome the problem by both requesting/sending a large chunk of the file in each single read/write request and by sending (queuing) multiple requests without waiting for a response to previous. For example WinSCP can request up to 32 chunks for 32 KB each at once, totaling 1 MB (these are defaults which can be altered with ''SFTPDownloadQueue'' and ''SFTPUploadQueue'' [[rawsettings|raw session settings]]). But if there's a big discrepancy between the bandwidth and the network delay, even that 1 MB can be too small to saturate the bandwidth. | ||
| - | See also [[wp>Bandwidth-delay product]] on Wikipedia. | + | See also [[wp>Bandwidth-delay_product|Bandwidth-delay product]] on Wikipedia. |
| In case the speed is throttled by a connection latency, it may help if you use [[scp|SCP protocol]] instead of [[sftp|SFTP]]. %%SCP%% is less affected by the latency. In this case, it may help if you turn on [[ui_login_ssh#protocol_options|compression]]. Toggling //[[ui_login_connection|Optimize connection buffer size]]//, in either way, can help too. | In case the speed is throttled by a connection latency, it may help if you use [[scp|SCP protocol]] instead of [[sftp|SFTP]]. %%SCP%% is less affected by the latency. In this case, it may help if you turn on [[ui_login_ssh#protocol_options|compression]]. Toggling //[[ui_login_connection|Optimize connection buffer size]]//, in either way, can help too. | ||