
     </P
><P
>      WAL sender background processes neglected to establish a
      <SPAN
CLASS="SYSTEMITEM"
>SIGALRM</SPAN
> handler, meaning they would wait forever in
      some corner cases where a timeout ought to happen.
     </P
></LI
><LI
><P
>      Back-patch 9.1 improvement to compress the fsync request queue
      (Robert Haas)
     </P
><P
>      This improves performance during checkpoints.  The 9.1 change
      has now seen enough field testing to seem safe to back-patch.
     </P
></LI
><LI
>