From: Magnus Leatti <magnusleatti@kernelriot.com>
To: Maxime Chevallier <maxime.chevallier@bootlin.com>
Cc: "Andrew Lunn" <andrew+netdev@lunn.ch>,
"Jakub Kicinski" <kuba@kernel.org>,
davem@davemloft.net, "Eric Dumazet" <edumazet@google.com>,
"Paolo Abeni" <pabeni@redhat.com>,
"Simon Horman" <horms@kernel.org>,
"Maxime Coquelin" <mcoquelin.stm32@gmail.com>,
"Alexandre Torgue" <alexandre.torgue@foss.st.com>,
"Russell King" <linux@armlinux.org.uk>,
"Lorenzo Bianconi" <lorenzo.bianconi@oss.qualcomm.com>,
"Nicolai Buchwitz" <nb@tipi-net.de>,
thomas.petazzoni@bootlin.com,
"Alexis Lothoré" <alexis.lothore@bootlin.com>,
netdev@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH net v2] net: stmmac: Clear DMA errors for multi-channel interrupts
Date: Tue, 10 Nov 2026 06:19:01 -0300 [thread overview]
Message-ID: <20261110091901.7080-1-magnusleatti@kernelriot.com> (raw)
In-Reply-To: <179379704484.488856.2140619507341432623@kernel.org>
> Since RBU and RPS were enabled only for statistics, was masking them in
> multi-MSI mode considered as an alternative?
Hi Maxime,
Tested that route on dwmac4 (YT6801, 7.3.3) next to v2.
Stock 7.3.3 dies in 4s under a 4x 64B UDP flood (122k irq/s storm).
Both v2 and dropping RBU from the abnormal mask survive with the same
~3M RX frames within noise (3 runs each, alternating), but:
v2 (A) no RBU irq (B)
MAC irqs: 18k - 43k 0
rx_buf_unav: 9k - 21k 0
%irq CPU: 3.9 - 7.1 1.1 - 1.5
RX frames: 2.5M - 3.0M 2.8M - 3.2M
Same on 8x UDP + TCP TX (30s): both stay up, A takes up to 33k MAC
irqs, B takes 0.
Caveats for B:
- Core is a 5.2, so only the 4.10 mask was exercised.
- RPS never fired, so this doesn't test the RPS storm fix from v2.
- rx_buf_unav_irq stays at 0 (pre-1b9707e6f1a9).
Want RBU dropped from the dwmac4 mask too? Can send a patch or you can
fold it into v3.
Magnus
prev parent reply other threads:[~2026-11-10 9:19 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-11-03 12:54 Maxime Chevallier
2026-11-03 13:21 ` Nicolai Buchwitz
2026-11-03 13:41 ` Lorenzo Bianconi
2026-11-03 16:58 ` Magnus Leatti
2026-11-04 12:57 ` netdev-bot+sashiko
2026-11-07 10:01 ` Magnus Leatti
2026-11-10 8:30 ` Paolo Abeni
2026-11-10 9:52 ` Magnus Leatti
2026-11-10 9:19 ` Magnus Leatti [this message]
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