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>,
Ovidiu Panait <ovidiu.panait.rb@renesas.com>,
Nicolai Buchwitz <nb@tipi-net.de>,
thomas.petazzoni@bootlin.com, alexis.lothore@bootlin.com,
netdev@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH net] net: stmmac: Clear DMA errors for multi-channel interrupts
Date: Mon, 2 Nov 2026 05:45:58 -0300 [thread overview]
Message-ID: <20261102084558.5105-1-magnusleatti@kernelriot.com> (raw)
In-Reply-To: <20261030102251.208929-1-maxime.chevallier@bootlin.com>
On 10/30/26 11:22, 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 :
Tested on a YT6801 (dwmac-motorcomm) with net at cb284914e749 and the
glue unmodified. Without this patch, a 64-byte UDP flood
(iperf3 -u -b 0 -l 64 -R -P 4) hangs the machine. On this board the
stuck RBU also keeps the MISC bit in MGMT_INT_CTRL0 set, so vector 5
fires about 120k times per second. With the patch, the MAC interrupt
only fires while the flood runs, about 1k/s, and stops afterwards;
same with eight streams plus a TX flood for 30 s. Throughput is
the same.
Tested-by: Magnus Leatti <magnusleatti@kernelriot.com>
nit: "YT8601" in the commit message should be YT6801.
next prev parent reply other threads:[~2026-11-02 8:47 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-10-30 10:22 Maxime Chevallier
2026-10-30 12:32 ` Lorenzo Bianconi
2026-10-30 19:33 ` Nicolai Buchwitz
2026-11-02 8:45 ` Magnus Leatti [this message]
2026-11-02 10:23 ` netdev-bot+sashiko
2026-11-02 10:40 ` Maxime Chevallier
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