linux-arch.vger.kernel.org archive mirror
 help / color / mirror / Atom feed
From: Thomas Gleixner <tglx@linutronix.de>
To: Luigi Rizzo <lrizzo@google.com>
Cc: Marc Zyngier <maz@kernel.org>,
	Luigi Rizzo <rizzo.unipi@gmail.com>,
	Paolo Abeni <pabeni@redhat.com>,
	Andrew Morton <akpm@linux-foundation.org>,
	Sean Christopherson <seanjc@google.com>,
	Jacob Pan <jacob.jun.pan@linux.intel.com>,
	linux-kernel@vger.kernel.org, linux-arch@vger.kernel.org,
	Bjorn Helgaas <bhelgaas@google.com>,
	Willem de Bruijn <willemb@google.com>
Subject: Re: [PATCH v2 4/8] genirq: soft_moderation: implement adaptive moderation
Date: Tue, 18 Nov 2025 10:00:57 +0100	[thread overview]
Message-ID: <875xb77m0m.ffs@tglx> (raw)
In-Reply-To: <CAMOZA0KKJ9S45-LnLtYKn-L8dL71tsfs29c6ZL3bkuTcNXorAw@mail.gmail.com>

On Mon, Nov 17 2025 at 22:34, Luigi Rizzo wrote:
> (First world problem, for sure: I have examples for AMD, Intel, Arm,
> all of them with 100+ CPUs per numa node, and 160-480 CPUs total)
> On some of the above platforms, MSIx interrupts cause heavy serialization
> of all other PCIe requests. As a result, when the total interrupt rate exceeds
> 1-2M intrs/s, I/O throughput degrades by up to 4x and more.

Is it actually the sum of all interrupts in the system or is it
segmented per root port?

Thanks,

        tglx

  parent reply	other threads:[~2025-11-18  9:00 UTC|newest]

Thread overview: 32+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2025-11-16 18:28 [PATCH v2 0/8] platform wide software interrupt moderation Luigi Rizzo
2025-11-16 18:28 ` [PATCH v2 1/8] genirq: platform wide interrupt moderation: Documentation, Kconfig, irq_desc Luigi Rizzo
2025-11-16 18:28 ` [PATCH v2 2/8] genirq: soft_moderation: add base files, procfs Luigi Rizzo
2025-11-17 11:12   ` kernel test robot
2025-11-17 16:01   ` Thomas Gleixner
2025-11-17 16:16     ` Luigi Rizzo
2025-11-17 19:35       ` Thomas Gleixner
2025-11-17 21:56   ` kernel test robot
2025-11-16 18:28 ` [PATCH v2 3/8] genirq: soft_moderation: implement fixed moderation Luigi Rizzo
2025-11-17 19:30   ` Thomas Gleixner
2025-11-17 23:16     ` Thomas Gleixner
2025-11-17 23:59       ` Luigi Rizzo
2025-11-18  8:34         ` Thomas Gleixner
2025-11-18 10:09           ` Luigi Rizzo
2025-11-18 16:31             ` Thomas Gleixner
2025-11-18 18:25               ` Luigi Rizzo
2025-11-18 23:06                 ` Luigi Rizzo
2025-11-19 14:43                   ` Thomas Gleixner
2025-11-21 10:58                     ` Luigi Rizzo
2025-11-21 14:33                       ` Luigi Rizzo
2025-11-22 14:08                       ` Thomas Gleixner
2025-11-16 18:28 ` [PATCH v2 4/8] genirq: soft_moderation: implement adaptive moderation Luigi Rizzo
2025-11-17 20:51   ` Thomas Gleixner
2025-11-17 21:34     ` Luigi Rizzo
2025-11-17 23:05       ` Thomas Gleixner
2025-11-18  9:00       ` Thomas Gleixner [this message]
2025-11-16 18:28 ` [PATCH v2 5/8] x86/irq: soft_moderation: add support for posted_msi (intel) Luigi Rizzo
2025-11-17 21:14   ` Thomas Gleixner
2025-11-17 21:36   ` kernel test robot
2025-11-16 18:28 ` [PATCH v2 6/8] genirq: soft_moderation: helpers for per-driver defaults Luigi Rizzo
2025-11-16 18:28 ` [PATCH v2 7/8] nvme-pci: add module parameter for default moderation mode Luigi Rizzo
2025-11-16 18:28 ` [PATCH v2 8/8] vfio-pci: " Luigi Rizzo

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=875xb77m0m.ffs@tglx \
    --to=tglx@linutronix.de \
    --cc=akpm@linux-foundation.org \
    --cc=bhelgaas@google.com \
    --cc=jacob.jun.pan@linux.intel.com \
    --cc=linux-arch@vger.kernel.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=lrizzo@google.com \
    --cc=maz@kernel.org \
    --cc=pabeni@redhat.com \
    --cc=rizzo.unipi@gmail.com \
    --cc=seanjc@google.com \
    --cc=willemb@google.com \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).