LKML Archive on lore.kernel.org
help / color / mirror / Atom feed
From: Bjorn Helgaas <helgaas@kernel.org>
To: Kai-Heng Feng <kai.heng.feng@canonical.com>
Cc: hkallweit1@gmail.com, nic_swsd@realtek.com, bhelgaas@google.com,
	davem@davemloft.net, kuba@kernel.org, anthony.wong@canonical.com,
	netdev@vger.kernel.org, linux-pci@vger.kernel.org,
	linux-kernel@vger.kernel.org
Subject: Re: [RFC] [PATCH net-next v5 3/3] r8169: Implement dynamic ASPM mechanism
Date: Thu, 16 Sep 2021 12:12:32 -0500	[thread overview]
Message-ID: <20210916171232.GA1624808@bjorn-Precision-5520> (raw)
In-Reply-To: <20210916154417.664323-4-kai.heng.feng@canonical.com>

On Thu, Sep 16, 2021 at 11:44:17PM +0800, Kai-Heng Feng wrote:
> r8169 NICs on some platforms have abysmal speed when ASPM is enabled.
> Same issue can be observed with older vendor drivers.
> 
> The issue is however solved by the latest vendor driver. There's a new
> mechanism, which disables r8169's internal ASPM when the NIC traffic has
> more than 10 packets, and vice versa. 

Obviously this is a *rate*, not an absolute number.  I think you mean
something like "10 packets in 1000ms".

> The possible reason for this is
> likely because the buffer on the chip is too small for its ASPM exit
> latency.
> 
> Realtek confirmed that all their PCIe LAN NICs, r8106, r8168 and r8125
> use dynamic ASPM under Windows. So implement the same mechanism here to
> resolve the issue.
> 
> Also introduce a lock to prevent race on accessing config registers.

Can you please include the bugzilla link where you attached lspci
data?  I think it's this:

  https://bugzilla.kernel.org/show_bug.cgi?id=214307

> Signed-off-by: Kai-Heng Feng <kai.heng.feng@canonical.com>

  reply	other threads:[~2021-09-16 17:52 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-09-16 15:44 [RFC] [PATCH net-next v5 0/3] r8169: Implement dynamic ASPM mechanism for recent 1.0/2.5Gbps Realtek NICs Kai-Heng Feng
2021-09-16 15:44 ` [RFC] [PATCH net-next v5 1/3] PCI/ASPM: Introduce a new helper to report ASPM capability Kai-Heng Feng
2021-09-16 15:44 ` [RFC] [PATCH net-next v5 2/3] r8169: Use PCIe ASPM status for NIC ASPM enablement Kai-Heng Feng
2021-09-16 17:07   ` Bjorn Helgaas
2021-09-17  4:09     ` Kai-Heng Feng
2021-09-17 15:26       ` Bjorn Helgaas
2021-10-01  4:32         ` Kai-Heng Feng
2021-09-16 15:44 ` [RFC] [PATCH net-next v5 3/3] r8169: Implement dynamic ASPM mechanism Kai-Heng Feng
2021-09-16 17:12   ` Bjorn Helgaas [this message]
2021-09-17  4:19     ` Kai-Heng Feng
2021-09-17 22:09 ` [RFC] [PATCH net-next v5 0/3] r8169: Implement dynamic ASPM mechanism for recent 1.0/2.5Gbps Realtek NICs Bjorn Helgaas
2021-10-01  4:17   ` Kai-Heng Feng
2021-10-07 19:10     ` Bjorn Helgaas
2021-10-08 13:56     ` Bjorn Helgaas

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=20210916171232.GA1624808@bjorn-Precision-5520 \
    --to=helgaas@kernel.org \
    --cc=anthony.wong@canonical.com \
    --cc=bhelgaas@google.com \
    --cc=davem@davemloft.net \
    --cc=hkallweit1@gmail.com \
    --cc=kai.heng.feng@canonical.com \
    --cc=kuba@kernel.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=linux-pci@vger.kernel.org \
    --cc=netdev@vger.kernel.org \
    --cc=nic_swsd@realtek.com \
    --subject='Re: [RFC] [PATCH net-next v5 3/3] r8169: Implement dynamic ASPM mechanism' \
    /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

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).