ff49ac69d4
Improve cache hit and increase packet rate on benchmarks. Signed-off-by: Andrew Rybchenko <arybchenko@solarflare.com>
46 lines
1.4 KiB
C
46 lines
1.4 KiB
C
/* SPDX-License-Identifier: BSD-3-Clause
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*
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* Copyright(c) 2019-2020 Xilinx, Inc.
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* Copyright(c) 2016-2019 Solarflare Communications Inc.
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*
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* This software was jointly developed between OKTET Labs (under contract
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* for Solarflare) and Solarflare Communications, Inc.
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*/
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#ifndef _SFC_TWEAK_H_
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#define _SFC_TWEAK_H_
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/*
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* The header is intended to collect defines/constants which could be
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* tweaked to improve the PMD performance characteristics depending on
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* the usecase or requirements (CPU load, packet rate, latency).
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*/
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/**
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* Number of Rx descriptors in the bulk submitted on Rx ring refill.
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*/
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#define SFC_RX_REFILL_BULK (RTE_CACHE_LINE_SIZE / sizeof(efx_qword_t))
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/**
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* Make the transmit path reap at least one time per a burst;
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* this improves cache locality because the same mbufs may be used to send
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* subsequent bursts in certain cases because of well-timed reap
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*/
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#define SFC_TX_XMIT_PKTS_REAP_AT_LEAST_ONCE 1
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/** Default free threshold follows recommendations from DPDK documentation */
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#define SFC_TX_DEFAULT_FREE_THRESH 32
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/** Number of mbufs to be freed in bulk in a single call */
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#define SFC_TX_REAP_BULK_SIZE 32
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/**
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* Default head-of-line block timeout to wait for Rx descriptor before
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* packet drop because of no descriptors available.
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*
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* DPDK FW variant only with equal stride super-buffer Rx mode.
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*/
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#define SFC_RXD_WAIT_TIMEOUT_NS_DEF (200U * 1000)
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#endif /* _SFC_TWEAK_H_ */
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