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Eric Dumazet authored
mlx4 driver has a suboptimal memory allocation strategy for regular MTU=1500 frames, as it uses two page fragments : One of 512 bytes and one of 1024 bytes. This makes GRO less effective, as each GSO packet contains 8 MSS instead of 16 MSS. Performance of a single TCP flow gains 25 % increase with the following patch. Before patch : A:~# netperf -H 192.168.0.2 -Cc MIGRATED TCP STREAM TEST ... Recv Send Send Utilization Service Demand Socket Socket Message Elapsed Send Recv Send Recv Size Size Size Time Throughput local remote local remote bytes bytes bytes secs. 10^6bits/s % S % S us/KB us/KB 87380 16384 16384 10.00 13798.47 3.06 4.20 0.436 0.598 After patch : A:~# netperf -H 192.68.0.2 -Cc MIGRATED TCP STREAM TEST ... Recv Send Send Utilization Service Demand Socket Socket Message Elapsed Send Recv Send Recv Size Size Size Time Throughput local remote local remote bytes bytes bytes secs. 10^6bits/s % S % S us/KB us/KB 87380 16384 16384 10.00 17273.80 3.44 4.19 0.391 0.477 Signed-off-by:
Eric Dumazet <edumazet@google.com> Cc: Amir Vadai <amirv@mellanox.com> Acked-By:
Amir Vadai <amirv@mellanox.com> Signed-off-by:
David S. Miller <davem@davemloft.net>
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