Allow the max TCP segment size to go up-to GSO_MAX_SIZE for MANA NIC.
This patch only increases the max allowable GSO_MAX_SIZE for MANA devices
and does not change the default.
Following are the perf benefits by increasing the segment size from
legacy gso_max_size value(64K) to newer one(up to 511K)
for i in {1..10}; do netperf -t TCP_RR -H 10.0.0.5 -p50000 -- -r80000,80000
-O MIN_LATENCY,P90_LATENCY,P99_LATENCY,THROUGHPUT|tail -1; done
min p90 p99 Throughput gso_max_size
93 171 194 6594.25
97 154 180 7183.74
95 165 189 6927.86
96 165 188 6976.04
93 154 185 7338.05 64K
93 168 189 6938.03
94 169 189 6784.93
92 166 189 7117.56
94 179 191 6678.44
95 157 183 7277.81
min p90 p99 Throughput
93 134 146 8448.75
95 134 140 8396.54
94 137 148 8204.12
94 137 148 8244.41
94 128 139 8666.52 80K
94 141 153 8116.86
94 138 149 8163.92
92 135 142 8362.72
92 134 142 8497.57
93 136 148 8393.23
Tested on azure env with Accelerated Networking enabled and disabled.
Signed-off-by: Shradha Gupta <shradhagu...@linux.microsoft.com>
Reviewed-by: Haiyang Zhang <haiya...@microsoft.com>
---
drivers/net/ethernet/microsoft/mana/mana_en.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/drivers/net/ethernet/microsoft/mana/mana_en.c
b/drivers/net/ethernet/microsoft/mana/mana_en.c
index aa1e47233fe5..da630cb37cfb 100644
--- a/drivers/net/ethernet/microsoft/mana/mana_en.c
+++ b/drivers/net/ethernet/microsoft/mana/mana_en.c
@@ -2873,6 +2873,8 @@ static int mana_probe_port(struct mana_context *ac, int
port_idx,
ndev->dev_port = port_idx;
SET_NETDEV_DEV(ndev, gc->dev);
+ netif_set_tso_max_size(ndev, GSO_MAX_SIZE);
+
netif_carrier_off(ndev);
netdev_rss_key_fill(apc->hashkey, MANA_HASH_KEY_SIZE);
--
2.34.1
