All of lore.kernel.org
 help / color / mirror / Atom feed
From: Thomas Gleixner <tglx@linutronix.de>
To: Huacai Chen <chenhuacai@gmail.com>
Cc: Marc Zyngier <maz@kernel.org>,
	Huacai Chen <chenhuacai@loongson.cn>,
	Bjorn Helgaas <bhelgaas@google.com>,
	linux-kernel@vger.kernel.org, loongson-kernel@lists.loongnix.cn,
	Xuefeng Li <lixuefeng@loongson.cn>,
	Jiaxun Yang <jiaxun.yang@flygoat.com>
Subject: Re: [PATCH 1/2] genirq/msi, platform-msi: Adjust return value of msi_domain_prepare_irqs()
Date: Tue, 30 May 2023 14:22:27 +0200	[thread overview]
Message-ID: <877csqj9fg.ffs@tglx> (raw)
In-Reply-To: <CAAhV-H6uZWgZQsVh=1-U2B4ZZZz6EPJ3gkv0mxHSNGOMPB=VwQ@mail.gmail.com>

On Tue, May 30 2023 at 16:34, Huacai Chen wrote:
> On Tue, May 30, 2023 at 4:19 AM Thomas Gleixner <tglx@linutronix.de> wrote:
>> Now take that number and divide it by the number of devices on the bus
>> and you get at least a sensible limit which does not immediately cause
>> vector exhaustion.
>>
>> That limit might be suboptimal if there are lots of other devices on
>> that bus which just require one or two vectors, but that's something
>> which can be optimized via a generic command line option or even a sysfs
>> mechanism.
> Hmm, if we still use the command line, then we still have some similar
> drawbacks.

Only for optimization. Without the optimization the limit might end up
being overbroad, but it definitely prevents vector exhaustion. For quite
some cases this might be even the proper limit which does not need any
further tweaking.

Thanks,

        tglx

  reply	other threads:[~2023-05-30 12:23 UTC|newest]

Thread overview: 17+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-05-27  5:46 [PATCH 0/2] Add machanism to limit msi allocation for Loongson Huacai Chen
2023-05-27  5:46 ` [PATCH 1/2] genirq/msi, platform-msi: Adjust return value of msi_domain_prepare_irqs() Huacai Chen
2023-05-27 14:03   ` Thomas Gleixner
2023-05-28  3:42     ` Huacai Chen
2023-05-29  7:44       ` Thomas Gleixner
2023-05-29  9:35         ` Huacai Chen
2023-05-28  7:47     ` Marc Zyngier
2023-05-28 12:07       ` Huacai Chen
2023-05-29  9:27         ` Thomas Gleixner
2023-05-29  9:36           ` Huacai Chen
2023-05-29 20:19             ` Thomas Gleixner
2023-05-30  8:34               ` Huacai Chen
2023-05-30 12:22                 ` Thomas Gleixner [this message]
2023-05-30 15:03                 ` Thomas Gleixner
2023-06-01 15:18                   ` Huacai Chen
2023-06-02  1:10                   ` bibo, mao
2023-05-27  5:46 ` [PATCH 2/2] irqchip/loongson-pch-msi: Add machanism to limit msi allocation Huacai Chen

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=877csqj9fg.ffs@tglx \
    --to=tglx@linutronix.de \
    --cc=bhelgaas@google.com \
    --cc=chenhuacai@gmail.com \
    --cc=chenhuacai@loongson.cn \
    --cc=jiaxun.yang@flygoat.com \
    --cc=linux-kernel@vger.kernel.org \
    --cc=lixuefeng@loongson.cn \
    --cc=loongson-kernel@lists.loongnix.cn \
    --cc=maz@kernel.org \
    /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 an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.