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f4106c728e
Add patch fixing regression from stmmac TX timer. Refer to the single patch for extensive details on the problem. This should restore original performance before 4.19 kernel. Fixes: #11676 Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>
38 lines
1.5 KiB
Diff
38 lines
1.5 KiB
Diff
From 13e24b0c4318b8b4d0a0fde7e5e7ccb982821c63 Mon Sep 17 00:00:00 2001
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From: Christian Marangi <ansuelsmth@gmail.com>
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Date: Mon, 18 Sep 2023 15:11:13 +0200
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Subject: [PATCH 3/3] net: stmmac: increase TX coalesce timer to 5ms
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Commit 8fce33317023 ("net: stmmac: Rework coalesce timer and fix
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multi-queue races") decreased the TX coalesce timer from 40ms to 1ms.
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This caused some performance regression on some target (regression was
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reported at least on ipq806x) in the order of 600mbps dropping from
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gigabit handling to only 200mbps.
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The problem was identified in the TX timer getting armed too much time.
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While this was fixed and improved in another commit, performance can be
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improved even further by increasing the timer delay a bit moving from
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1ms to 5ms.
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The value is a good balance between battery saving by prevending too
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much interrupt to be generated and permitting good performance for
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internet oriented devices.
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Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>
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---
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drivers/net/ethernet/stmicro/stmmac/common.h | 2 +-
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1 file changed, 1 insertion(+), 1 deletion(-)
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--- a/drivers/net/ethernet/stmicro/stmmac/common.h
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+++ b/drivers/net/ethernet/stmicro/stmmac/common.h
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@@ -286,7 +286,7 @@ struct stmmac_safety_stats {
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#define MIN_DMA_RIWT 0x10
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#define DEF_DMA_RIWT 0xa0
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/* Tx coalesce parameters */
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-#define STMMAC_COAL_TX_TIMER 1000
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+#define STMMAC_COAL_TX_TIMER 5000
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#define STMMAC_MAX_COAL_TX_TICK 100000
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#define STMMAC_TX_MAX_FRAMES 256
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#define STMMAC_TX_FRAMES 25
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