On 23/12/20 11:51 pm, Michael Stone wrote:
On Wed, Dec 23, 2020 at 11:37:07PM +0800, Jeremy Ardley wrote:I did some tests and found there was around a 10-20% difference in speedbetween runs.Yes, if you want more consistent numbers you'd need much larger test file sizes; if the transfer is taking less than a second there's a lot of noise in the data. I didn't bother because this is sufficient to show that the encryption algorithm isn't the bottleneck on 1 Gbit ethernet and I didn't feel like waiting longer for larger transfers. :-) You're also maxing out 2 cores just for crypto doing this, and the actual packet handling will take a bit more CPU--so if the system isn't completely idle other processes can affect the results. Again, not significant for a rough approximation.
I have 12 cores, mostly idle, but I get your point.Getting back to the original question, rsync is inherently slower because both ends do deep file inspection and handshaking to decide what data transfer is required. scp is usually faster.
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