netdev - Re: [PATCH v2 net-next 13/14] mlx4: support BIG TCP packets

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Date:   Tue, 8 Mar 2022 18:03:05 +0200
From:   Tariq Toukan <ttoukan.linux@...il.com>
To:     Eric Dumazet <eric.dumazet@...il.com>,
        "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>
Cc:     netdev <netdev@...r.kernel.org>,
        Eric Dumazet <edumazet@...gle.com>,
        Coco Li <lixiaoyan@...gle.com>,
        David Ahern <dsahern@...nel.org>,
        Alexander Duyck <alexanderduyck@...com>,
        Tariq Toukan <tariqt@...dia.com>
Subject: Re: [PATCH v2 net-next 13/14] mlx4: support BIG TCP packets



On 3/3/2022 8:16 PM, Eric Dumazet wrote:
> From: Eric Dumazet <edumazet@...gle.com>
> 
> mlx4 supports LSOv2 just fine.
> 
> IPv6 stack inserts a temporary Hop-by-Hop header
> with JUMBO TLV for big packets.
> 
> We need to ignore the HBH header when populating TX descriptor.
> 
> Tested:
> 
> Before: (not enabling bigger TSO/GRO packets)
> 
> ip link set dev eth0 gso_ipv6_max_size 65536 gro_ipv6_max_size 65536
> 
> netperf -H lpaa18 -t TCP_RR -T2,2 -l 10 -Cc -- -r 70000,70000
> MIGRATED TCP REQUEST/RESPONSE TEST from ::0 (::) port 0 AF_INET6 to lpaa18.prod.google.com () port 0 AF_INET6 : first burst 0 : cpu bind
> Local /Remote
> Socket Size   Request Resp.  Elapsed Trans.   CPU    CPU    S.dem   S.dem
> Send   Recv   Size    Size   Time    Rate     local  remote local   remote
> bytes  bytes  bytes   bytes  secs.   per sec  % S    % S    us/Tr   us/Tr
> 
> 262144 540000 70000   70000  10.00   6591.45  0.86   1.34   62.490  97.446
> 262144 540000
> 
> After: (enabling bigger TSO/GRO packets)
> 
> ip link set dev eth0 gso_ipv6_max_size 185000 gro_ipv6_max_size 185000
> 
> netperf -H lpaa18 -t TCP_RR -T2,2 -l 10 -Cc -- -r 70000,70000
> MIGRATED TCP REQUEST/RESPONSE TEST from ::0 (::) port 0 AF_INET6 to lpaa18.prod.google.com () port 0 AF_INET6 : first burst 0 : cpu bind
> Local /Remote
> Socket Size   Request Resp.  Elapsed Trans.   CPU    CPU    S.dem   S.dem
> Send   Recv   Size    Size   Time    Rate     local  remote local   remote
> bytes  bytes  bytes   bytes  secs.   per sec  % S    % S    us/Tr   us/Tr
> 
> 262144 540000 70000   70000  10.00   8383.95  0.95   1.01   54.432  57.584
> 262144 540000
> 
> Signed-off-by: Eric Dumazet <edumazet@...gle.com>
> Cc: Tariq Toukan <tariqt@...dia.com>
> ---
>   .../net/ethernet/mellanox/mlx4/en_netdev.c    |  3 ++
>   drivers/net/ethernet/mellanox/mlx4/en_tx.c    | 47 +++++++++++++++----
>   2 files changed, 41 insertions(+), 9 deletions(-)
> 

Reviewed-by: Tariq Toukan <tariqt@...dia.com>

Thanks.