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From: Andre Oppermann <andre@FreeBSD.org>
Date: Fri, 17 Sep 2010 22:05:27 +0000 (UTC)
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Subject: cvs commit: src/sys/netinet tcp_output.c
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andre       2010-09-17 22:05:27 UTC

  FreeBSD src repository

  Modified files:
    sys/netinet          tcp_output.c 
  Log:
  SVN rev 212803 on 2010-09-17 22:05:27Z by andre
  
  Rearrange the TSO code to make it more readable and to clearly
  separate the decision logic, of whether we can do TSO, and the
  calculation of the burst length into two distinct parts.
  
  Change the way the TSO burst length calculation is done. While
  TSO could do bursts of 65535 bytes that can't be represented in
  ip_len together with the IP and TCP header. Account for that and
  use IP_MAXPACKET instead of TCP_MAXWIN as base constant (both
  have the same value of 64K). When more data is available prevent
  less than MSS sized segments from being sent during the current
  TSO burst.
  
  Add two more KASSERTs to ensure the integrity of the packets.
  
  Tested by:      Ben Wilber <ben-at-desync com>
  MFC after:      10 days
  
  Revision  Changes    Path
  1.172     +49 -33    src/sys/netinet/tcp_output.c