From: Thomas Petazzoni via buildroot <buildroot@buildroot.org>
To: Fengwei Tan <tfx2001@outlook.com>
Cc: buildroot@buildroot.org,
Francois Dugast <francois.dugast.foss@gmail.com>
Subject: Re: [Buildroot] [PATCH v2] configs/visionfive2_defconfig: bump Linux to 6.18.55
Date: Sat, 10 Oct 2026 18:34:34 +0200 [thread overview]
Message-ID: <asppDyOWhx3sIjVt@windsurf> (raw)
In-Reply-To: <SY8P300MB0041EEB4A158C2FCD79854B4B5912@SY8P300MB0041.AUSP300.PROD.OUTLOOK.COM>
On Sun, Oct 11, 2026 at 12:31:48AM +0800, Fengwei Tan wrote:
> When running iperf3 with Linux 6.18.51 on VisionFive 2, one CPU core
> stays at 100% load during the test, while network throughput is limited
> to approximately 793 Mbits/sec:
>
> [ ID] Interval Transfer Bitrate
> [ 5] 0.00-10.01 sec 945 MBytes 793 Mbits/sec receiver
>
> The regression was introduced in Linux 6.14 by commit df542f669307
> ("net: stmmac: Switch to zero-copy in non-XDP RX path"). It leads to
> misaligned access exceptions when parsing packet headers. During the
> iperf3 test, perf stat reported approximately 9.6 million alignment
> faults over 5 seconds:
>
> $ perf stat -a -e alignment-faults -- sleep 5
>
> Performance counter stats for 'system wide':
>
> 9620073 alignment-faults
>
> 5.029337000 seconds time elapsed
>
> The kernel must emulate these unaligned accesses, resulting in
> significant overhead.
>
> The issue was fixed in Linux 6.18.52 [1]. Bump Linux to 6.18.55, the
> latest stable release at the time of writing, to include the fix.
>
> [1] https://lore.kernel.org/all/2026091704-CVE-2026-90059-36e6@gregkh
>
> Fixes: 98aa14a186e1 ("configs/visionfive2: bump Linux to 6.18.51, U-Boot to 2026.07, and OpenSBI to 1.8.1")
> Assisted-by: LLM
> Signed-off-by: Fengwei Tan <tfx2001@outlook.com>
Applied to master, thanks!
Best regards,
Thomas Petazzoni
--
Thomas Petazzoni, co-owner and CEO, Bootlin
Embedded Linux and Kernel engineering and training
https://bootlin.com
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prev parent reply other threads:[~2026-10-13 17:55 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-10-10 16:31 [Buildroot] [PATCH v2] configs/visionfive2_defconfig: bump Linux to 6.18.55 Fengwei Tan
2026-10-10 16:34 ` Thomas Petazzoni via buildroot [this message]
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