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| author | Eric Dumazet <edumazet@google.com> | 2016-06-07 21:24:18 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2016-06-09 23:39:46 -0700 |
| commit | f7d3c1cbe34bfcb3eb94a80409ed2577394d0d28 (patch) | |
| tree | bdbd381860082b95629ab7cb21ee85839f00441e /drivers/net/ethernet/cavium | |
| parent | c8d83963709ea69f7433c7b4fe3e8c3a4288458a (diff) | |
| download | linux-f7d3c1cbe34bfcb3eb94a80409ed2577394d0d28.tar.gz linux-f7d3c1cbe34bfcb3eb94a80409ed2577394d0d28.tar.bz2 linux-f7d3c1cbe34bfcb3eb94a80409ed2577394d0d28.zip | |
net/mlx4_en: fix ethtool -x
mlx4 RSS is limited to spread incoming packets to a power of two number
of queues.
An uniformly distibuted traffic would be split on queues 0 to N-1, N
being a power of two, each queue having a 1/N weight.
If number of RX queues is not a power of two, upper RX queues do not
receive traffic.
ethtool -x is lying, because it pretends some queues have higher weight.
Before patch:
lpaa24:~# ethtool -L eth1 rx 24
lpaa24:~# ethtool -x eth1
RX flow hash indirection table for eth1 with 24 RX ring(s):
0: 0 1 2 3 4 5 6 7
8: 8 9 10 11 12 13 14 15
16: 0 1 2 3 4 5 6 7
RSS hash key:
e0:7c:3a:89:07:55:b6:58:69:cc:f4:e5:24:62:e3:25:88:6c:42:5b:d2:cb:9a:d2:e0:06:e1:dc:f9:09:a1:89:0f:a0:30:43:73:6f:0c:b6
If this information was correct, user space tools could expect queues 0
to 7 to receive twice more traffic than queues 8 to 15
After patch :
lpaa24:~# ethtool -L eth1 rx 24
lpaa24:~# ethtool -x eth1
RX flow hash indirection table for eth1 with 24 RX ring(s):
0: 0 1 2 3 4 5 6 7
8: 8 9 10 11 12 13 14 15
RSS hash key:
da:7b:09:60:f1:ac:67:b4:d0:72:d4:ec:a2:e5:80:0a:ad:50:22:1a:f8:f9:66:54:5f:22:45:c3:88:f4:57:82:c1:c1:90:ed:70:cb:40:ce
lpaa24:~# ethtool -X eth1 equal 8
lpaa24:~# ethtool -x eth1
RX flow hash indirection table for eth1 with 24 RX ring(s):
0: 0 1 2 3 4 5 6 7
8: 0 1 2 3 4 5 6 7
RSS hash key:
da:7b:09:60:f1:ac:67:b4:d0:72:d4:ec:a2:e5:80:0a:ad:50:22:1a:f8:f9:66:54:5f:22:45:c3:88:f4:57:82:c1:c1:90:ed:70:cb:40:ce
Signed-off-by: Eric Dumazet <edumazet@google.com>
Reported-by: Maciej Żenczykowski <maze@google.com>
Cc: Eugenia Emantayev <eugenia@mellanox.com>
Cc: Wei Wang <weiwan@google.com>
Cc: Willem de Bruijn <willemb@google.com>
Reviewed-by: Tariq Toukan <tariqt@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/ethernet/cavium')
0 files changed, 0 insertions, 0 deletions