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, 3 Nov 2026 13:58:08 -0300 [thread overview]
Message-ID: <20261103165808.72113-1-magnusleatti@kernelriot.com> (raw)
In-Reply-To: <20261103125430.962715-1-maxime.chevallier@bootlin.com>
On 11/3/26 13:54, Maxime Chevallier wrote:
> The Multi-MSI interrupt handler doesn't clear the DMA error interrupts,
> and this leads to interrupt storms when one of these interrupts starts
> firing :
Retested v2 on the YT6801, same setup as v1: net at cb284914e749, glue
unmodified, so the MISC interrupt stays unmasked.
4x 64-byte UDP RX flood for 10 s, same kernel:
without the patch: the MAC interrupt hits about 93k/s within 4 s,
stays at about 122k/s after the flood stops, and the machine stops
responding.
with v2: about 300/s during the flood, 0 after.
8x 64-byte UDP RX plus TCP TX for 30 s: about 25/s during, 0 after,
with TX at 744 Mbit/s alongside.
The 4x flood also runs clean after link down/up, ring resize, an MTU
change, a 100/1000 speed change and a module reload. Throughput is the
same as with v1 (TCP RX 941, TCP TX 825 Mbit/s).
Tested-by: Magnus Leatti <magnusleatti@kernelriot.com>
prev parent reply other threads:[~2026-11-03 16:58 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-11-03 12:54 [PATCH net v2] net: stmmac: Clear DMA errors for multi-channel interrupts Maxime Chevallier
2026-11-03 13:21 ` Nicolai Buchwitz
2026-11-03 13:41 ` Lorenzo Bianconi
2026-11-03 16:58 ` Magnus Leatti [this message]
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