netdev - Re: Performance Regression due to ASPM disable patch

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Date: Thu, 13 Jul 2023 14:37:00 +0200
From: "Linux regression tracking #adding (Thorsten Leemhuis)"
 <regressions@...mhuis.info>
To: Anuj Gupta <anuj20.g@...sung.com>, hkallweit1@...il.com,
 davem@...emloft.net
Cc: holger@...lied-asynchrony.com, kai.heng.feng@...onical.com,
 simon.horman@...igine.com, nic_swsd@...ltek.com, netdev@...r.kernel.org,
 linux-nvme@...ts.infradead.org,
 Linux kernel regressions list <regressions@...ts.linux.dev>
Subject: Re: Performance Regression due to ASPM disable patch

[CCing the regression list, as it should be in the loop for regressions:
https://docs.kernel.org/admin-guide/reporting-regressions.html]

[TLDR: I'm adding this report to the list of tracked Linux kernel
regressions; the text you find below is based on a few templates
paragraphs you might have encountered already in similar form.
See link in footer if these mails annoy you.]

On 12.07.23 17:55, Anuj Gupta wrote:
> 
> I see a performance regression for read/write workloads on our NVMe over
> fabrics using TCP as transport setup.
> IOPS drop by 23% for 4k-randread [1] and by 18% for 4k-randwrite [2].
> 
> I bisected and found that the commit
> e1ed3e4d91112027b90c7ee61479141b3f948e6a ("r8169: disable ASPM during
> NAPI poll") is the trigger.
> When I revert this commit, the performance drop goes away.
> 
> The target machine uses a realtek ethernet controller
> [...]

Thanks for the report. To be sure the issue doesn't fall through the
cracks unnoticed, I'm adding it to regzbot, the Linux kernel regression
tracking bot:

#regzbot ^introduced e1ed3e4d91112027b90c7ee61479141b3f94
#regzbot title net: r8169: performance regression for read/write
workloads on our NVMe over fabrics
#regzbot ignore-activity

This isn't a regression? This issue or a fix for it are already
discussed somewhere else? It was fixed already? You want to clarify when
the regression started to happen? Or point out I got the title or
something else totally wrong? Then just reply and tell me -- ideally
while also telling regzbot about it, as explained by the page listed in
the footer of this mail.

Developers: When fixing the issue, remember to add 'Link:' tags pointing
to the report (the parent of this mail). See page linked in footer for
details.

Ciao, Thorsten (wearing his 'the Linux kernel's regression tracker' hat)
--
Everything you wanna know about Linux kernel regression tracking:
https://linux-regtracking.leemhuis.info/about/#tldr
That page also explains what to do if mails like this annoy you.