netdev - Re: Kernel 4.19 network performance - forwarding/routing normal users traffic

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Message-ID: <6d52b197-c303-eeac-2992-cedfd78115c0@itcare.pl>
Date:   Thu, 8 Nov 2018 18:30:04 +0100
From:   Paweł Staszewski <pstaszewski@...are.pl>
To:     David Ahern <dsahern@...il.com>,
        Jesper Dangaard Brouer <brouer@...hat.com>
Cc:     netdev <netdev@...r.kernel.org>, Yoel Caspersen <yoel@...knet.dk>
Subject: Re: Kernel 4.19 network performance - forwarding/routing normal users
 traffic



W dniu 08.11.2018 o 17:32, David Ahern pisze:
> On 11/8/18 9:27 AM, Paweł Staszewski wrote:
>>>> What hardware is this?
>>>>
>> mellanox connectx 4
>> ethtool -i enp175s0f0
>> driver: mlx5_core
>> version: 5.0-0
>> firmware-version: 12.21.1000 (SM_2001000001033)
>> expansion-rom-version:
>> bus-info: 0000:af:00.0
>> supports-statistics: yes
>> supports-test: yes
>> supports-eeprom-access: no
>> supports-register-dump: no
>> supports-priv-flags: yes
>>
>> ethtool -i enp175s0f1
>> driver: mlx5_core
>> version: 5.0-0
>> firmware-version: 12.21.1000 (SM_2001000001033)
>> expansion-rom-version:
>> bus-info: 0000:af:00.1
>> supports-statistics: yes
>> supports-test: yes
>> supports-eeprom-access: no
>> supports-register-dump: no
>> supports-priv-flags: yes
>>
>>>> Start with:
>>>>
>>>> echo 1 > /sys/kernel/debug/tracing/events/xdp/enable
>>>> cat /sys/kernel/debug/tracing/trace_pipe
>>>   cat /sys/kernel/debug/tracing/trace_pipe
>>>           <idle>-0     [045] ..s. 68469.467752: xdp_devmap_xmit:
>>> ndo_xdp_xmit map_id=32 map_index=5 action=REDIRECT sent=0 drops=1
>>> from_ifindex=4 to_ifindex=5 err=-6
> FIB lookup is good, the redirect is happening, but the mlx5 driver does
> not like it.
>
> I think the -6 is coming from the mlx5 driver and the packet is getting
> dropped. Perhaps this check in mlx5e_xdp_xmit:
>
>         if (unlikely(sq_num >= priv->channels.num))
>                  return -ENXIO;
>
Wondering about this:
swapper     0 [045] 68494.770287: fib:fib_table_lookup: table 254 oif 0 
iif 6 proto 1 192.168.22.237/0 -> 172.16.0.2/0 tos 0 scope 0 flags 0 ==> 
dev vlan1740 gw 0.0.0.0 src 172.16.0.1 err 0
             7fff818c13b5 fib_table_lookup ([kernel.kallsyms])

oif 0 ?

Is that correct here ?


>
>>> swapper     0 [045] 68493.746274: fib:fib_table_lookup: table 254 oif
>>> 0 iif 6 proto 1 192.168.22.237/0 -> 172.16.0.2/0 tos 0 scope 0 flags 0
>>> ==> dev vlan1740 gw 0.0.0.0 src 172.16.0.1 err 0
>>>              7fff818c13b5 fib_table_lookup ([kernel.kallsyms])
>>>
>>> swapper     0 [045] 68494.770287: fib:fib_table_lookup: table 254 oif
>>> 0 iif 6 proto 1 192.168.22.237/0 -> 172.16.0.2/0 tos 0 scope 0 flags 0
>>> ==> dev vlan1740 gw 0.0.0.0 src 172.16.0.1 err 0
>>>              7fff818c13b5 fib_table_lookup ([kernel.kallsyms])
>>>
>>> swapper     0 [045] 68495.794304: fib:fib_table_lookup: table 254 oif
>>> 0 iif 6 proto 1 192.168.22.237/0 -> 172.16.0.2/0 tos 0 scope 0 flags 0
>>> ==> dev vlan1740 gw 0.0.0.0 src 172.16.0.1 err 0
>>>              7fff818c13b5 fib_table_lookup ([kernel.kallsyms])
>>>
>>> swapper     0 [045] 68496.818308: fib:fib_table_lookup: table 254 oif
>>> 0 iif 6 proto 1 192.168.22.237/0 -> 172.16.0.2/0 tos 0 scope 0 flags 0
>>> ==> dev vlan1740 gw 0.0.0.0 src 172.16.0.1 err 0
>>>              7fff818c13b5 fib_table_lookup ([kernel.kallsyms])
>>>
>>> swapper     0 [045] 68497.842313: fib:fib_table_lookup: table 254 oif
>>> 0 iif 6 proto 1 192.168.22.237/0 -> 172.16.0.2/0 tos 0 scope 0 flags 0
>>> ==> dev vlan1740 gw 0.0.0.0 src 172.16.0.1 err 0
>>>              7fff818c13b5 fib_table_lookup ([kernel.kallsyms])