kernel/include/linux/net_dim.h, branch linux-5.14.y

linux/dim: Move implementation to .c files

2019-06-25T20:46:39Z

Moved all logic from dim.h and net_dim.h to dim.c and net_dim.c. This is both more structurally appealing and would allow to only expose externally used functions. Signed-off-by: Tal Gilboa Signed-off-by: Saeed Mahameed

linux/dim: Rename externally used net_dim members

2019-06-25T20:46:39Z

Removed 'net' prefix from functions and structs used by external drivers. Signed-off-by: Tal Gilboa Signed-off-by: Saeed Mahameed

linux/dim: Rename net_dim_sample() to net_dim_update_sample()

2019-06-25T20:46:39Z

In order to avoid confusion between the function and the similarly named struct. In preparation for removing the 'net' prefix from dim members. Signed-off-by: Tal Gilboa Signed-off-by: Saeed Mahameed

linux/dim: Rename externally exposed macros

2019-06-25T20:46:39Z

Renamed macros in use by external drivers. Signed-off-by: Tal Gilboa Signed-off-by: Saeed Mahameed

linux/dim: Remove "net" prefix from internal DIM members

2019-06-25T20:46:38Z

Only renaming functions and structs which aren't used by an external code. Signed-off-by: Tal Gilboa Signed-off-by: Saeed Mahameed

linux/dim: Move logic to dim.h

2019-06-25T20:46:38Z

In preparation for supporting more implementations of the DIM algorithm, I'm moving what would become common logic to a common library. Downstream DIM implementations will use the common lib for their implementation. Signed-off-by: Tal Gilboa Signed-off-by: Saeed Mahameed

net/dim: Update DIM start sample after each DIM iteration

2018-11-22T19:36:54Z

On every iteration of net_dim, the algorithm may choose to check for the system state by comparing current data sample with previous data sample. After each of these comparison, regardless of the action taken, the sample used as baseline is needed to be updated. This patch fixes a bug that causes DIM to take wrong decisions, due to never updating the baseline sample for comparison between iterations. This way, DIM always compares current sample with zeros. Although this is a functional fix, it also improves and stabilizes performance as the algorithm works properly now. Performance: Tested single UDP TX stream with pktgen: samples/pktgen/pktgen_sample03_burst_single_flow.sh -i p4p2 -d 1.1.1.1 -m 24:8a:07:88:26:8b -f 3 -b 128 ConnectX-5 100GbE packet rate improved from 15-19Mpps to 19-20Mpps. Also, toggling between profiles is less frequent with the fix. Fixes: 8115b750dbcb ("net/dim: use struct net_dim_sample as arg to net_dim") Signed-off-by: Tal Gilboa Reviewed-by: Tariq Toukan Signed-off-by: David S. Miller

include/linux/bitops.h: introduce BITS_PER_TYPE

2018-08-22T17:52:48Z

net_dim.h has a rather useful extension to BITS_PER_BYTE to compute the number of bits in a type (BITS_PER_BYTE * sizeof(T)), so promote the macro to bitops.h, alongside BITS_PER_BYTE, for wider usage. Link: http://lkml.kernel.org/r/20180706094458.14116-1-chris@chris-wilson.co.uk Signed-off-by: Chris Wilson Reviewed-by: Jani Nikula Cc: Randy Dunlap Cc: Andy Gospodarek Cc: David S. Miller Cc: Thomas Gleixner Cc: Ingo Molnar Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

net/dim: Support adaptive TX moderation

2018-04-24T14:15:07Z

Interrupt moderation for TX traffic requires different profiles than RX interrupt moderation. The main goal here is to reduce interrupt rate and allow better payload aggregation by keeping SKBs in the TX queue a bit longer. Ping-pong behavior would get a profile with a short timer, so latency wouldn't increase for these scenarios. There might be a slight degradation in bandwidth for single stream with large message sizes, since net.ipv4.tcp_limit_output_bytes is limiting the allowed TX traffic, but with many streams performance is always improved. Signed-off-by: Tal Gilboa Reviewed-by: Tariq Toukan Signed-off-by: David S. Miller

net/dim: Rename _get_profile() functions to _get_rx_moderation()

2018-04-24T14:15:07Z

Preparation for introducing adaptive TX to net DIM. Signed-off-by: Tal Gilboa Reviewed-by: Tariq Toukan Signed-off-by: David S. Miller

kernel/include/linux/net_dim.h, branch linux-5.14.y

linux/dim: Move implementation to .c files

linux/dim: Rename externally used net_dim members

linux/dim: Rename net_dim_sample() to net_dim_update_sample()

linux/dim: Rename externally exposed macros

linux/dim: Remove "net" prefix from internal DIM members

linux/dim: Move logic to dim.h

net/dim: Update DIM start sample after each DIM iteration

include/linux/bitops.h: introduce BITS_PER_TYPE

net/dim: Support adaptive TX moderation

net/dim: Rename *_get_profile() functions to *_get_rx_moderation()

net/dim: Rename _get_profile() functions to _get_rx_moderation()