cvs commit: src/sys/kern uipc_syscalls.c src/sys/sys socket.h

[Mike Silbersack]

silby       2004/02/07 23:35:48 PST

  FreeBSD src repository

  Modified files:
    sys/kern             uipc_syscalls.c 
    sys/sys              socket.h 
  Log:
  Add the SF_NODISKIO flag to sendfile.  This flag causes sendfile to be
  mindful of blocking on disk I/O and instead return EBUSY when such
  blocking would occur.
  
  Results from the DeBox project indicate that blocking on disk I/O
  can slow the performance of a kqueue/poll based webserver.  Using
  a flag such as SF_NODISKIO and throwing connections that would block
  to helper processes/threads helped increase performance.
  
  Currently, only the Flash webserver uses this flag, although it could
  probably be applied to thttpd with relative ease.
  
  Idea by:        Yaoping Ruan & Vivek Pai
  
  Revision  Changes    Path
  1.173     +22 -19    src/sys/kern/uipc_syscalls.c
  1.76      +5 -0      src/sys/sys/socket.h