Profile multiple simultaneous requests about dote

[chrisstaite]

After these changes the CPU usage has dropped to around 20%. However there are copious errors in the syslog:
Apr 11 23:10:17 router DoTe[23298]: Error reading from forwarder
Apr 11 23:10:17 router DoTe[23298]: Error handshaking with forwarder
Apr 11 23:10:18 router DoTe[23298]: Error handshaking with forwarder
Apr 11 23:10:18 router DoTe[23298]: Error reading from forwarder
Apr 11 23:10:18 router DoTe[23298]: Error handshaking with forwarder

I wonder if making multiple connections to the forwarder at the same time is banned?

[chrisstaite]

I found a memory leak, so perhaps that solves the issue?

[chrisstaite]

Works better, but when using something like Chrome it still outputs the errors:

Apr 12 21:19:19 router DoTe[27242]: Error reading from forwarder
Apr 12 21:19:19 router DoTe[27242]: Error reading from forwarder
Apr 12 21:19:19 router DoTe[27242]: Error handshaking with forwarder
Apr 12 21:19:19 router DoTe[27242]: Error reading from forwarder
Apr 12 21:19:20 router DoTe[27242]: Error handshaking with forwarder

This is still probably a problem with having multiple connections open at the same time. Perhaps it should queue them? How many is a reasonable number to have simultaneously?

[chrisstaite]

Running using the following command seems to work with roughly 300ms per query on an EdgeRouter Lite 3:
/config/dote -s [::1]:5353 -m 1 -c ECDHE-ECDSA-AES128-SHA256

[chrisstaite]

The new caching manages around 250ms per query now.

[chrisstaite]

Using the 9.9.9.9 forwarder results in around 50ms response times rather than the 250ms response time of 1.1.1.1.

[chrisstaite]

With the new error handling for OpenSSL this seems to have resolved the issue, however the ciphers for 1.1.1.1 are way too slow for the ERLite-3. This command line seems to allow it to function nicely without too much delay.

dote -s '[::1]:5354' -f '[2620:fe::fe]' -h dns.quad9.net -p 'tiHzyeqdIvOButLP6if2s7R7dEaE/0V7grju+KJjCsQ=' -f '[2620:fe::9]' -h dns.quad9.net -p 'tiHzyeqdIvOButLP6if2s7R7dEaE/0V7grju+KJjCsQ=' -f '9.9.9.9' -h dns.quad9.net -p 'tiHzyeqdIvOButLP6if2s7R7dEaE/0V7grju+KJjCsQ=' -m 2