From: Claudiu Manoil <claudiu.man...@nxp.com> Date: Tue, 21 Jul 2020 10:55:16 +0300
> Apart from some related cleanup patches, this set > introduces in a straightforward way the support needed > to enable and configure interrupt coalescing for ENETC. > > Patch 5 introduces the support needed for configuring the > interrupt coalescing parameters and for switching between > moderated (int. coalescing) and per-packet interrupt modes. > When interrupt coalescing is enabled the Rx/Tx time > thresholds are configurable, packet thresholds are fixed. > To make this work reliably, patch 5 uses the traffic > pause procedure introduced in patch 2. > > Patch 6 adds DIM (Dynamic Interrupt Moderation) to implement > adaptive coalescing based on time thresholds, for the Rx 'channel'. > On the Tx side a default optimal value is used instead, optimized for > TCP traffic over 1G and 2.5G links. This default 'optimal' value can > be overridden anytime via 'ethtool -C tx-usecs'. > > netperf -t TCP_MAERTS measurements show a significant CPU load > reduction correlated w/ reduced interrupt rates. For the > measurement results refer to the comments in patch 6. > > v2: Replaced Tx DIM with predefined optimal value, giving > better results. This was also suggested by Jakub (cc). > Switched order of patches 4 and 5, for better grouping. > > v3: minor cleanup/improvements Series applied, thank you.
