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version 1.8, 2022/09/29 03:30:40 version 1.9, 2022/09/29 21:52:51
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 <li>Various kernel improvements:  <li>Various kernel improvements:
   <ul>    <ul>
     <li>pf(4) automatically allows IGMP and ICMP6 MLD packets with
       router alert option.
       Special allow-opts rules are no longer needed for multicast
       discovery.
     <li>Implement "show all routes" to print routing tables in ddb(4).
     <li>Count dropped network packets due to low memory in netstat(1).
   <li>...    <li>...
   </ul>    </ul>
   
 <li>SMP Improvements  <li>SMP Improvements
   <ul>    <ul>
     <li>Make route timer MP safe and use pool rttmr.
     <li>Use kernel lock to protect parts of ARP, ND6 and PPPoE that
       are not MP safe.
       Lookup of existing ARP entry is MP safe and can run in parallel.
     <li>Start up to 4 softnet tasks to run IP input and forwarding
       in parallel on multiple cores.
     <li>Run IPv4 packet reassembly in parallel.
     <li>Run IPv6 hop-by-hop options processing in parallel.
     <li>Add a mutex to rate limiting functions to make them MP safe.
     <li>Introduce mutex and reference counter for internet protocol
       control block.
     <li>Protect UDP, raw IP, and divert packet input routines
       with a per socket mutex.
     <li>Protect recv(2) system call for UDP and raw IP packets with
       a per socket mutex and shared netlock.
       Allows to receive packets while forwarding in parallel.
     <li>Protect multicast deliver loop for UDP and raw IP sockets with rwlock.
     <li>Only grab netlock in IGMP and MDL6 timer when necessary.
     <li>TCP slow timer runs without netlock.
     <li>Rework rwlock so that a writer will get the lock eventually.
       Readers cannot share the lock forever.
       This prevents starvation of the writer.
     <li>Run interface media ioctl with shared netlock so packets
       can be processed while running ifconfig(8).
     <li>btrace(8) can be used to debug reference counting.
     <li>Use MP safe refcount for interface addresses.
   <li>...    <li>...
   </ul>    </ul>
   
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