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From: Robert Watson <rwatson@FreeBSD.org>
Date: Fri, 3 Oct 2003 11:27:25 -0700 (PDT)
To: src-committers@FreeBSD.org, cvs-src@FreeBSD.org,
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Subject: cvs commit: src/sys/net netisr.c
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rwatson     2003/10/03 11:27:25 PDT

  FreeBSD src repository

  Modified files:
    sys/net              netisr.c 
  Log:
  When direct dispatching an netisr (net.isr.enable=1), if there are already
  any queued packets for the isr, process those packets before the newly
  submitted packet, maintaining ordering of all packets being delivered
  to the netisr.  Remove the bypass counter since we don't bypass anymore.
  Leave the comment about possible problems and options since later
  performance optimization may change the strategy for addressing ordering
  problems here.
  
  Specifically, this maintains the strong isr ordering guarantee; additional
  parallelism and lower latency may be possible by moving to weaker
  guarantees (per-interface, for example).  We will probably at some point
  also want to remove the one instance netisr dispatch limit currently
  enforced by a mutex, but it's not clear that's 100% safe yet, even in
  the netperf branch.
  
  Reviewed by:    sam, others
  
  Revision  Changes    Path
  1.7       +21 -13    src/sys/net/netisr.c