diff options
| author | Eric Dumazet <edumazet@google.com> | 2018-11-11 07:34:28 -0800 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2018-11-11 13:57:03 -0800 |
| commit | c73e5807e4f6fc6d373a5db55b45f639f8bb6328 (patch) | |
| tree | 09c332f796e245e7ec15cc31905e61f793da451b /Makefile | |
| parent | 83afb36a7097bdf6776e261fa3a2bf2dc5a4a8c2 (diff) | |
tcp: tsq: no longer use limit_output_bytes for paced flows
FQ pacing guarantees that paced packets queued by one flow do not
add head-of-line blocking for other flows.
After TCP GSO conversion, increasing limit_output_bytes to 1 MB is safe,
since this maps to 16 skbs at most in qdisc or device queues.
(or slightly more if some drivers lower {gso_max_segs|size})
We still can queue at most 1 ms worth of traffic (this can be scaled
by wifi drivers if they need to)
Tested:
# ethtool -c eth0 | egrep "tx-usecs:|tx-frames:" # 40 Gbit mlx4 NIC
tx-usecs: 16
tx-frames: 16
# tc qdisc replace dev eth0 root fq
# for f in {1..10};do netperf -P0 -H lpaa24,6 -o THROUGHPUT;done
Before patch:
27711
26118
27107
27377
27712
27388
27340
27117
27278
27509
After patch:
37434
36949
36658
36998
37711
37291
37605
36659
36544
37349
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'Makefile')
0 files changed, 0 insertions, 0 deletions