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657-qdisc_reduce_truesize.patch

657-qdisc_reduce_truesize.patch 1.9 KB
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  1. From bc9fec2f87d57bdbff30d296605e24504513f65c Mon Sep 17 00:00:00 2001
    2. 

  2. From: =?UTF-8?q?Dave=20T=C3=A4ht?= <dave.taht@bufferbloat.net>
    3. 

  3. Date: Mon, 17 Sep 2012 19:20:22 -0700
    4. 

  4. Subject: [PATCH 4/7] net: add skb_reduce_truesize support to common qdiscs
    5. 

  5. 

  6. Reduce skb size under load when queues begin to fill on the
    7. 

  7. commont qdiscs.
    8. 

  8. ---
    9. 

  9.  net/sched/sch_codel.c    |    2 ++
    10. 

  10.  net/sched/sch_fifo.c     |   12 ++++++++----
    11. 

  11.  net/sched/sch_fq_codel.c |    2 ++
    12. 

  12.  3 files changed, 12 insertions(+), 4 deletions(-)
    13. 

  13. 

  14. --- a/net/sched/sch_codel.c
    15. 

  15. +++ b/net/sched/sch_codel.c
    16. 

  16. @@ -97,6 +97,8 @@ static int codel_qdisc_enqueue(struct sk
    17. 

  17.  	struct codel_sched_data *q;
    18. 

  18.  
    19. 

  19.  	if (likely(qdisc_qlen(sch) < sch->limit)) {
    20. 

  20. +		if(qdisc_qlen(sch) > 128)
    21. 

  21. +			skb = skb_reduce_truesize(skb);
    22. 

  22.  		codel_set_enqueue_time(skb);
    23. 

  23.  		return qdisc_enqueue_tail(skb, sch);
    24. 

  24.  	}
    25. 

  25. --- a/net/sched/sch_fifo.c
    26. 

  26. +++ b/net/sched/sch_fifo.c
    27. 

  27. @@ -29,17 +29,21 @@ static int bfifo_enqueue(struct sk_buff
    28. 

  28.  
    29. 

  29.  static int pfifo_enqueue(struct sk_buff *skb, struct Qdisc *sch)
    30. 

  30.  {
    31. 

  31. -	if (likely(skb_queue_len(&sch->q) < sch->limit))
    32. 

  32. +	if (likely(skb_queue_len(&sch->q) < sch->limit)) {
    33. 

  33. +		if (skb_queue_len(&sch->q) > 128)
    34. 

  34. +			skb = skb_reduce_truesize(skb);
    35. 

  35.  		return qdisc_enqueue_tail(skb, sch);
    36. 

  36. -
    37. 

  37. +	}
    38. 

  38.  	return qdisc_reshape_fail(skb, sch);
    39. 

  39.  }
    40. 

  40.  
    41. 

  41.  static int pfifo_tail_enqueue(struct sk_buff *skb, struct Qdisc *sch)
    42. 

  42.  {
    43. 

  43. -	if (likely(skb_queue_len(&sch->q) < sch->limit))
    44. 

  44. +	if (likely(skb_queue_len(&sch->q) < sch->limit)) {
    45. 

  45. +		if (skb_queue_len(&sch->q) > 128)
    46. 

  46. +			skb = skb_reduce_truesize(skb);
    47. 

  47.  		return qdisc_enqueue_tail(skb, sch);
    48. 

  48. -
    49. 

  49. +	}
    50. 

  50.  	/* queue full, remove one skb to fulfill the limit */
    51. 

  51.  	__qdisc_queue_drop_head(sch, &sch->q);
    52. 

  52.  	qdisc_qstats_drop(sch);
    53. 

  53. --- a/net/sched/sch_fq_codel.c
    54. 

  54. +++ b/net/sched/sch_fq_codel.c
    55. 

  55. @@ -185,6 +185,8 @@ static int fq_codel_enqueue(struct sk_bu
    56. 

  56.  		return ret;
    57. 

  57.  	}
    58. 

  58.  	idx--;
    59. 

  59. +	if (sch->q.qlen > 128)
    60. 

  60. +		skb = skb_reduce_truesize(skb);
    61. 

  61.  
    62. 

  62.  	codel_set_enqueue_time(skb);
    63. 

  63.  	flow = &q->flows[idx];
    64.