1. 17 3月, 2009 37 次提交
  2. 16 3月, 2009 3 次提交
    • I
      tcp: make sure xmit goal size never becomes zero · afece1c6
      Ilpo Järvinen 提交于
      It's not too likely to happen, would basically require crafted
      packets (must hit the max guard in tcp_bound_to_half_wnd()).
      It seems that nothing that bad would happen as there's tcp_mems
      and congestion window that prevent runaway at some point from
      hurting all too much (I'm not that sure what all those zero
      sized segments we would generate do though in write queue).
      Preventing it regardless is certainly the best way to go.
      Signed-off-by: NIlpo Järvinen <ilpo.jarvinen@helsinki.fi>
      Cc: Evgeniy Polyakov <zbr@ioremap.net>
      Cc: Ingo Molnar <mingo@elte.hu>
      Signed-off-by: NDavid S. Miller <davem@davemloft.net>
      afece1c6
    • I
      tcp: cache result of earlier divides when mss-aligning things · 2a3a041c
      Ilpo Järvinen 提交于
      The results is very unlikely change every so often so we
      hardly need to divide again after doing that once for a
      connection. Yet, if divide still becomes necessary we
      detect that and do the right thing and again settle for
      non-divide state. Takes the u16 space which was previously
      taken by the plain xmit_size_goal.
      
      This should take care part of the tso vs non-tso difference
      we found earlier.
      Signed-off-by: NIlpo Järvinen <ilpo.jarvinen@helsinki.fi>
      Signed-off-by: NDavid S. Miller <davem@davemloft.net>
      2a3a041c
    • I
      tcp: simplify tcp_current_mss · 0c54b85f
      Ilpo Järvinen 提交于
      There's very little need for most of the callsites to get
      tp->xmit_goal_size updated. That will cost us divide as is,
      so slice the function in two. Also, the only users of the
      tp->xmit_goal_size are directly behind tcp_current_mss(),
      so there's no need to store that variable into tcp_sock
      at all! The drop of xmit_goal_size currently leaves 16-bit
      hole and some reorganization would again be necessary to
      change that (but I'm aiming to fill that hole with u16
      xmit_goal_size_segs to cache the results of the remaining
      divide to get that tso on regression).
      
      Bring xmit_goal_size parts into tcp.c
      Signed-off-by: NIlpo Järvinen <ilpo.jarvinen@helsinki.fi>
      Cc: Evgeniy Polyakov <zbr@ioremap.net>
      Cc: Ingo Molnar <mingo@elte.hu>
      Signed-off-by: NDavid S. Miller <davem@davemloft.net>
      0c54b85f