IRC chat logs for #ltsp on irc.libera.chat (webchat)
Channel log from 21 May 2022 (all times are UTC)
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| 13:55 | <bobby99> hi. is anyone aware of a way to enable aes-ni for ssh on ubuntu?
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| 14:05 | <alkisg> For LTSP? You can set SSH_OPTIONS in ltsp.conf
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| 14:06 | <bobby99> I know. But how can I enable aes-ni that way?
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| 14:07 | <alkisg> I'm not sure what you mean, it's just an ssh option.
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| 14:07 | man ssh_config, option Cipher, it maps to ssh command line options
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| 14:08 | <bobby99> This option selects the cipher used. It does not select if the cipher runs in software or in hardware.
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| 14:08 | <alkisg> If your hardware supports it ,it will be used. If not, not.
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| 14:09 | There's no software option for "enforce hardware support"...
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| 14:11 | <bobby99> I have run some performance tests, and chacha20 turns out to be faster than aes ciphers. System load also went up during the tests. So I assume that aes-ni ist not used.
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| 14:15 | <alkisg> cat /proc/cpuinfo says if it supports aes
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| 14:16 | <bobby99> I know. I can see "aes" for all the cores.
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| 14:16 | <alkisg> ssh -q cipher says the selected cipher
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| 14:17 | # `ssh -vv $host hostname 2>&1 | grep cipher:` for the selected one
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| 14:17 | # Speed test: yes | pv | ssh $host "cat >/dev/null"
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| 14:17 | # Or: yes | pv | ssh -o "Ciphers=aes128-ctr" $host "cat >/dev/null"
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| 14:32 | In all my tests where aes was supported by hardware, aes128-ctr was the fastest cipher from all of them
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| 14:32 | chacha was only faster in raspberry pis, nowhere else
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| 14:35 | <bobby99> I'll re-check my numbers
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