Bug#1143143: RAID10 rebuild high CPU low throughput after upgrade from Bookworm

From	Salvatore Bonaccorso <carnil@debian.org>
Newsgroups	linux.debian.bugs.dist, linux.debian.kernel
Subject	Bug#1143143: RAID10 rebuild high CPU low throughput after upgrade from Bookworm
Date	2026-08-04 07:20 +0200
Message-ID	<NofJf-8Q96-3@gated-at.bofh.it> (permalink)
References	<NmGXf-7XoA-1@gated-at.bofh.it> <NmGXf-7XoA-1@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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Hi Timothy,

On Thu, Jul 30, 2026 at 04:49:11PM -0500, Timothy Pearson wrote:
> Package: linux
> Version: 6.12.94-1
> 
> After upgrading from Bookworm (6.1.0-18), rebuilding a degraded
> RAID10 array proceeds at ~1MB/s with 100% CPU load on one core.
> Booting the same system with the old 6.1 series kernel and resuming
> the rebuild of the same array proceeds at over 200MB/s with minimal
> CPU load.  This is on a LSI SAS3008 RAID controller, and the default
> 6.12 readahead settings were adjusted back down to the same values
> as the 6.1 kernel with no improvement.

6.12.94-1 is not the most current kernel on trixie and there were many
bugfixes up to to 6.12.100-1. Can you still reproduce the problem
there?

Regards,
Salvatore

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Bug#1143143: RAID10 rebuild high CPU low throughput after upgrade from Bookworm Timothy Pearson <tpearson@raptorengineering.com> - 2026-07-31 00:00 +0200
  Processed: Re: Bug#1143143: RAID10 rebuild high CPU low  throughput after upgrade from Bookworm "Debian Bug Tracking System" <owner@bugs.debian.org> - 2026-08-04 07:20 +0200
  Bug#1143143: RAID10 rebuild high CPU low throughput after upgrade from Bookworm Salvatore Bonaccorso <carnil@debian.org> - 2026-08-04 07:20 +0200

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