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sch_cake: Make gso-splitting configurable from userspace

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This patch restores cake's deployed behavior at line rate to always
split gso, and makes gso splitting configurable from userspace.

running cake unlimited (unshaped) at 1gigE, local traffic:

no-split-gso bql limit: 131966
split-gso bql limit:   ~42392-45420

On this 4 stream test splitting gso apart results in halving the
observed interpacket latency at no loss in throughput.

Summary of tcp_nup test run 'gso-split' (at 2018-07-26 16:03:51.824728):

 Ping (ms) ICMP :         0.83         0.81 ms              341
 TCP upload avg :       235.43       235.39 Mbits/s         301
 TCP upload sum :       941.71       941.56 Mbits/s         301
 TCP upload::1  :       235.45       235.43 Mbits/s         271
 TCP upload::2  :       235.45       235.41 Mbits/s         289
 TCP upload::3  :       235.40       235.40 Mbits/s         288
 TCP upload::4  :       235.41       235.40 Mbits/s         291

verses

Summary of tcp_nup test run 'no-split-gso' (at 2018-07-26 16:37:23.563960):

                           avg       median          # data pts
 Ping (ms) ICMP :         1.67         1.73 ms              348
 TCP upload avg :       234.56       235.37 Mbits/s         301
 TCP upload sum :       938.24       941.49 Mbits/s         301
 TCP upload::1  :       234.55       235.38 Mbits/s         285
 TCP upload::2  :       234.57       235.37 Mbits/s         286
 TCP upload::3  :       234.58       235.37 Mbits/s         274
 TCP upload::4  :       234.54       235.42 Mbits/s         288

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Dave Taht 2018-07-26 19:45:10 -07:00 • committed by David S. Miller
commit 2db6dc2662
1 changed files with 7 additions and 6 deletions

7
net/sched/sch_cake.c
View file

@ -80,7 +80,6 @@
#define CAKE_QUEUES (1024) #define CAKE_QUEUES (1024)
#define CAKE_FLOW_MASK 63 #define CAKE_FLOW_MASK 63
#define CAKE_FLOW_NAT_FLAG 64 #define CAKE_FLOW_NAT_FLAG 64
#define CAKE_SPLIT_GSO_THRESHOLD (125000000) /* 1Gbps */
/* struct cobalt_params - contains codel and blue parameters /* struct cobalt_params - contains codel and blue parameters
* @interval: codel initial drop rate * @interval: codel initial drop rate
@ -2569,10 +2568,12 @@ static int cake_change(struct Qdisc *sch, struct nlattr *opt,
if (tb[TCA_CAKE_MEMORY]) if (tb[TCA_CAKE_MEMORY])
q->buffer_config_limit = nla_get_u32(tb[TCA_CAKE_MEMORY]); q->buffer_config_limit = nla_get_u32(tb[TCA_CAKE_MEMORY]);
if (q->rate_bps && q->rate_bps <= CAKE_SPLIT_GSO_THRESHOLD) if (tb[TCA_CAKE_SPLIT_GSO]) {
if (!!nla_get_u32(tb[TCA_CAKE_SPLIT_GSO]))
q->rate_flags |= CAKE_FLAG_SPLIT_GSO; q->rate_flags |= CAKE_FLAG_SPLIT_GSO;
else else
q->rate_flags &= ~CAKE_FLAG_SPLIT_GSO; q->rate_flags &= ~CAKE_FLAG_SPLIT_GSO;
}
if (q->tins) { if (q->tins) {
sch_tree_lock(sch); sch_tree_lock(sch);
@ -2608,7 +2609,7 @@ static int cake_init(struct Qdisc *sch, struct nlattr *opt,
q->target = 5000; /* 5ms: codel RFC argues q->target = 5000; /* 5ms: codel RFC argues
* for 5 to 10% of interval * for 5 to 10% of interval
*/ */
q->rate_flags |= CAKE_FLAG_SPLIT_GSO;
q->cur_tin = 0; q->cur_tin = 0;
q->cur_flow = 0; q->cur_flow = 0;