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  1. 08 8月, 2013 1 次提交
    • E
      tcp: cubic: fix overflow error in bictcp_update() · 2ed0edf9
      由 Eric Dumazet 提交于 
      commit 17a6e9f1 ("tcp_cubic: fix clock dependency") added an
overflow error in bictcp_update() in following code :

/* change the unit from HZ to bictcp_HZ */
t = ((tcp_time_stamp + msecs_to_jiffies(ca->delay_min>>3) -
      ca->epoch_start) << BICTCP_HZ) / HZ;

Because msecs_to_jiffies() being unsigned long, compiler does
implicit type promotion.

We really want to constrain (tcp_time_stamp - ca->epoch_start)
to a signed 32bit value, or else 't' has unexpected high values.

This bugs triggers an increase of retransmit rates ~24 days after
boot [1], as the high order bit of tcp_time_stamp flips.

[1] for hosts with HZ=1000

Big thanks to Van Jacobson for spotting this problem.
Diagnosed-by: NVan Jacobson <vanj@google.com>
Signed-off-by: NEric Dumazet <edumazet@google.com>
Cc: Neal Cardwell <ncardwell@google.com>
Cc: Yuchung Cheng <ycheng@google.com>
Cc: Stephen Hemminger <stephen@networkplumber.org>
Acked-by: NNeal Cardwell <ncardwell@google.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>
      2ed0edf9
  3. 21 1月, 2012 1 次提交
    • N
      tcp: fix undo after RTO for CUBIC · 5a45f008
      由 Neal Cardwell 提交于 
      This patch fixes CUBIC so that cwnd reductions made during RTOs can be
undone (just as they already can be undone when using the default/Reno
behavior).

When undoing cwnd reductions, BIC-derived congestion control modules
were restoring the cwnd from last_max_cwnd. There were two problems
with using last_max_cwnd to restore a cwnd during undo:

(a) last_max_cwnd was set to 0 on state transitions into TCP_CA_Loss
(by calling the module's reset() functions), so cwnd reductions from
RTOs could not be undone.

(b) when fast_covergence is enabled (which it is by default)
last_max_cwnd does not actually hold the value of snd_cwnd before the
loss; instead, it holds a scaled-down version of snd_cwnd.

This patch makes the following changes:

(1) upon undo, revert snd_cwnd to ca->loss_cwnd, which is already, as
the existing comment notes, the "congestion window at last loss"

(2) stop forgetting ca->loss_cwnd on TCP_CA_Loss events

(3) use ca->last_max_cwnd to check if we're in slow start
Signed-off-by: NNeal Cardwell <ncardwell@google.com>
Acked-by: NStephen Hemminger <shemminger@vyatta.com>
Acked-by: NSangtae Ha <sangtae.ha@gmail.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>
      5a45f008
  5. 09 5月, 2011 1 次提交
  7. 15 3月, 2011 6 次提交
  9. 10 3月, 2011 1 次提交
  11. 02 3月, 2009 1 次提交
  13. 02 11月, 2008 1 次提交
  15. 01 5月, 2008 1 次提交
    • R
      rename div64_64 to div64_u64 · 6f6d6a1a
      由 Roman Zippel 提交于 
      Rename div64_64 to div64_u64 to make it consistent with the other divide
functions, so it clearly includes the type of the divide.  Move its definition
to math64.h as currently no architecture overrides the generic implementation.
 They can still override it of course, but the duplicated declarations are
avoided.
Signed-off-by: NRoman Zippel <zippel@linux-m68k.org>
Cc: Avi Kivity <avi@qumranet.com>
Cc: Russell King <rmk@arm.linux.org.uk>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: David Howells <dhowells@redhat.com>
Cc: Jeff Dike <jdike@addtoit.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Patrick McHardy <kaber@trash.net>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
      6f6d6a1a
  17. 05 3月, 2008 1 次提交
  19. 29 1月, 2008 1 次提交
  21. 11 10月, 2007 1 次提交
  23. 31 7月, 2007 2 次提交
  25. 18 7月, 2007 1 次提交
  27. 13 6月, 2007 1 次提交
  29. 26 4月, 2007 5 次提交
  31. 13 2月, 2007 1 次提交
  33. 11 2月, 2007 1 次提交
  35. 26 10月, 2006 1 次提交
  37. 23 9月, 2006 1 次提交
  39. 01 7月, 2006 1 次提交
  41. 18 6月, 2006 1 次提交
  43. 04 1月, 2006 3 次提交