diff options
| author | Igor Russkikh <irusskikh@marvell.com> | 2019-11-07 22:42:06 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2019-11-07 19:54:43 -0800 |
| commit | 822cd114cd05a47b7c272de9b3a4da73114894ca (patch) | |
| tree | ca561e2124bacc2ca21686ef92fcccd18c4bbd17 /Documentation/networking | |
| parent | 8009bb1928a6d5b0ce2d8a1dba79972f01e50533 (diff) | |
net: atlantic: implement UDP GSO offload
atlantic hardware does support UDP hardware segmentation offload.
This allows user to specify one large contiguous buffer with data
which then will be split automagically into multiple UDP packets
of specified size.
Bulk sending of large UDP streams lowers CPU usage and increases
bandwidth.
We did estimations both with udpgso_bench_tx test tool and with modified
iperf3 measurement tool (4 streams, multithread, 200b packet size)
over AQC<->AQC 10G link. Flow control is disabled to prevent RX side
impact on measurements.
No UDP GSO:
iperf3 -c 10.0.1.2 -u -b0 -l 200 -P4 --multithread
UDP GSO:
iperf3 -c 10.0.1.2 -u -b0 -l 12600 --udp-lso 200 -P4 --multithread
Mode CPU iperf speed Line speed Packets per second
-------------------------------------------------------------
NO UDP GSO 350% 3.07 Gbps 3.8 Gbps 1,919,419
SW UDP GSO 200% 5.55 Gbps 6.4 Gbps 3,286,144
HW UDP GSO 90% 6.80 Gbps 8.4 Gbps 4,273,117
Signed-off-by: Igor Russkikh <irusskikh@marvell.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'Documentation/networking')
| -rw-r--r-- | Documentation/networking/device_drivers/aquantia/atlantic.txt | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/Documentation/networking/device_drivers/aquantia/atlantic.txt b/Documentation/networking/device_drivers/aquantia/atlantic.txt index cf3e88ca885e..4c70f300e4eb 100644 --- a/Documentation/networking/device_drivers/aquantia/atlantic.txt +++ b/Documentation/networking/device_drivers/aquantia/atlantic.txt @@ -325,6 +325,21 @@ Supported ethtool options Example: ethtool -N eth0 flow-type udp4 action 0 loc 32 + UDP GSO hardware offload + --------------------------------- + UDP GSO allows to boost UDP tx rates by offloading UDP headers allocation + into hardware. A special userspace socket option is required for this, + could be validated with /kernel/tools/testing/selftests/net/ + + udpgso_bench_tx -u -4 -D 10.0.1.1 -s 6300 -S 100 + + Will cause sending out of 100 byte sized UDP packets formed from single + 6300 bytes user buffer. + + UDP GSO is configured by: + + ethtool -K eth0 tx-udp-segmentation on + Private flags (testing) --------------------------------- |