Timeline for Why is copy speed periodic? (or seems to be)
Current License: CC BY-SA 4.0
8 events
| when toggle format | what | by | license | comment | |
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| Nov 13, 2021 at 1:33 | comment | added | Cort Ammon | Related: if this were being transferred over a network, rather than between USB devices, there is an interesting "sliding window" algorithm in TCP which can have effects like this. It's actually known to screw up UDP video streams on the same network, because its hard for the UDP stream to figure out how much bandwidth is available... the TCP stream will keep interrupting it | |
| Nov 13, 2021 at 1:22 | comment | added | J... | If your data is a collection of many instances of a smaller group of mixed files (ie: is periodic) then this can be another source of periodicity in the data transfer rate. For smaller files the per-file I/O overhead is significant with respect to the required data transfer time so the effective transfer rate goes down as file size gets smaller. This can be a bit of a fingerprint of the distribution of file sizes in a transfer. | |
| Nov 12, 2021 at 15:07 | vote | accept | Paamand | ||
| Nov 11, 2021 at 20:30 | history | became hot network question | |||
| Nov 11, 2021 at 15:10 | answer | added | gnasher729 | timeline score: 11 | |
| Nov 11, 2021 at 14:26 | answer | added | user123 | timeline score: 4 | |
| S Nov 11, 2021 at 11:02 | review | First questions | |||
| Nov 11, 2021 at 15:18 | |||||
| S Nov 11, 2021 at 11:02 | history | asked | Paamand | CC BY-SA 4.0 |