Add some debug notes

1 files changed, 13 insertions, 0 deletions

diff --git a/README.md b/README.md
index 25299c8..b28dac4 100644
--- a/README.md
+++ b/README.md
@@ -132,6 +132,19 @@ domains/s, it would be wise to roll-back _at least_ 6000 lines.
 
 Get in touch if you know a fix, e.g., based on `ulimit` and `sysctl` tinkering.
 
+More debug notes:
+
+  - My system is not fully utilized wrt. CPU/MEM/BW; an odd thing is that it
+    seems to work fine to run multiple onion-grab instances as separate
+    commands, e.g., 3x `-w 280` to get up to ~225 Mbps utilization (max).
+    Adding a fourth instance gets me into the same problem as documented above.
+  - Tinkering with with options in http.Transport doesn't seem help.
+  - Using multiple http.Client doesn't help (e.g., one per worker)
+  - An odd thing is that after errors, it appears that only DNS is dead.  E.g.,
+    `curl https://www.rgdd.se` fails while `curl --resolve
+    www.rgdd.se:443:213.164.207.87` succeeds.  Replacing the system's DNS with a
+    local unbound process doesn't seem to help though.
+
 ## Contact
 
   - rasmus (at) rgdd (dot) se