3b15089249
This commit backports patches from OpenWrt's master branch which increase cache performance, reduce NAPI weight and fix bugs.
34 lines
1.3 KiB
Diff
34 lines
1.3 KiB
Diff
From: Rosen Penev <rosenp@gmail.com>
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Date: Mon, 4 Dec 2017 11:40:22 -0800
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Subject: ag71xx: Reduce NAPI weight to 32.
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Qualcomm claims this reduces cache misses. Original commit message below:
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From: Ben Menchaca <ben.menchaca@qca.qualcomm.com>
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Date: Tue, 11 Jun 2013 12:18:46 -0500
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Subject: [ag71xx] reduce NAPI weight
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In an attempt to increase our cache warmth, we are decreasing NAPI.
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This increases the warmth of the reused SKBs.
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Signed-off-by: Ben Menchaca <ben.menchaca@qca.qualcomm.com>
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Signed-off-by: Rosen Penev <rosenp@gmail.com>
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diff --git a/target/linux/ar71xx/files/drivers/net/ethernet/atheros/ag71xx/ag71xx.h b/target/linux/ar71xx/files/drivers/net/ethernet/atheros/ag71xx/ag71xx.h
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index 7b1cc1e1032f7b87430a9be1507ddb3e3faa26bc..71fbe8975b22c291ed13bb549f6b4d2951ff67c0 100644
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--- a/target/linux/ar71xx/files/drivers/net/ethernet/atheros/ag71xx/ag71xx.h
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+++ b/target/linux/ar71xx/files/drivers/net/ethernet/atheros/ag71xx/ag71xx.h
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@@ -40,6 +40,12 @@
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#define AG71XX_DRV_NAME "ag71xx"
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#define AG71XX_DRV_VERSION "0.5.35"
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+/*
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+ * For our NAPI weight bigger does *NOT* mean better - it means more
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+ * D-cache misses and lots more wasted cycles than we'll ever
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+ * possibly gain from saving instructions.
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+ */
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+#define AG71XX_NAPI_WEIGHT 32
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#define AG71XX_OOM_REFILL (1 + HZ/10)
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#define AG71XX_INT_ERR (AG71XX_INT_RX_BE | AG71XX_INT_TX_BE)
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