On a linksys E1200v1 (actually a crossflashed E1000v2), the offloading features
give no measurable benefit to speed or latency. Furthermore, disabling GRO
actually improves iperf performance by a whoppimg 3mbps. Results:
Currently:
[ 4] local 192.168.1.1 port 5001 connected with 192.168.1.100 port 52410
[ ID] Interval Transfer Bandwidth Reads Dist(bin=16.0K)
[ 4] 0.00-10.02 sec 52.4 MBytes 43.8 Mbits/sec 641 75:181:12:1:1:0:0:371
[ 5] local 192.168.1.1 port 5001 connected with 192.168.1.100 port 52412
[ 5] 0.00-10.02 sec 52.4 MBytes 43.8 Mbits/sec 629 51:194:13:1:0:1:0:369
[ 4] local 192.168.1.1 port 5001 connected with 192.168.1.100 port 52414
[ 4] 0.00-10.02 sec 51.9 MBytes 43.4 Mbits/sec 695 126:203:1:0:0:0:2:363
[ 5] local 192.168.1.1 port 5001 connected with 192.168.1.100 port 52416
[ 5] 0.00-10.01 sec 52.4 MBytes 43.9 Mbits/sec 626 57:186:10:0:0:0:0:373
[ 4] local 192.168.1.1 port 5001 connected with 192.168.1.100 port 52420
[ 4] 0.00-10.02 sec 52.4 MBytes 43.8 Mbits/sec 605 36:179:16:1:0:1:0:372
[ 5] local 192.168.1.1 port 5001 connected with 192.168.1.100 port 52422
After disabling everything - including GRO:
[ 4] local 192.168.1.1 port 5001 connected with 192.168.1.100 port 52440
[ ID] Interval Transfer Bandwidth Reads Dist(bin=16.0K)
[ 4] 0.00-10.01 sec 55.1 MBytes 46.2 Mbits/sec 672 180:82:0:0:1:0:0:409
[ 5] local 192.168.1.1 port 5001 connected with 192.168.1.100 port 52442
[ 5] 0.00-10.01 sec 56.0 MBytes 46.9 Mbits/sec 636 117:96:0:0:1:0:0:422
[ 4] local 192.168.1.1 port 5001 connected with 192.168.1.100 port 52444
[ 4] 0.00-10.01 sec 55.4 MBytes 46.4 Mbits/sec 675 172:92:0:0:1:0:0:410
[ 5] local 192.168.1.1 port 5001 connected with 192.168.1.100 port 52446
[ 5] 0.00-10.01 sec 56.0 MBytes 46.9 Mbits/sec 633 119:90:0:1:1:0:0:422
[ 4] local 192.168.1.1 port 5001 connected with 192.168.1.100 port 52448
[ 4] 0.00-10.01 sec 55.2 MBytes 46.3 Mbits/sec 688 157:123:0:0:2:0:0:406
Signed-off-by: Rosen Penev <ros...@gmail.com>
---
drivers/net/ethernet/broadcom/bgmac.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/net/ethernet/broadcom/bgmac.c
b/drivers/net/ethernet/broadcom/bgmac.c
index 48d672b204a4..c2db5673b073 100644
--- a/drivers/net/ethernet/broadcom/bgmac.c
+++ b/drivers/net/ethernet/broadcom/bgmac.c
@@ -1534,7 +1534,7 @@ int bgmac_enet_probe(struct bgmac *bgmac)
goto err_dma_free;
}
- net_dev->features = NETIF_F_SG | NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM;
+ net_dev->features &= NETIF_F_GRO;
net_dev->hw_features = net_dev->features;
net_dev->vlan_features = net_dev->features;
--
2.13.5
