Linux-PCI Archive on
 help / color / Atom feed
From: Nicholas Johnson <>
To: Bjorn Helgaas <>
Cc: Logan Gunthorpe <>,
	Benjamin Herrenschmidt <>,
	Mika Westerberg <>,
	"" <>
Subject: Possible PCI Regression Linux 5.3-rc1
Date: Wed, 24 Jul 2019 12:54:00 +0000
Message-ID: <SL2P216MB01878BBCD75F21D882AEEA2880C60@SL2P216MB0187.KORP216.PROD.OUTLOOK.COM> (raw)

Hi all,

I was just rebasing my patches for linux 5.3-rc1 and noticed a possible 
regression that shows on both of my machines. It is also reproducible 
with the unmodified Ubuntu mainline kernel, downloadable at [1].

Running the lspci command takes 1-3 seconds with 5.3-rc1 (rather than an 
imperceivable amount of time). Booting with pci.dyndbg does not reveal 

$ uname -r
$ time lspci -vt 1>/dev/null

real	0m2.321s
user	0m0.026s
sys	0m0.000s

If none of you are aware of this or what is causing it, I will submit a 
bug report to Bugzilla.

I am away from 2019-07-27 to mid 2019-08-04. I will post my patches for 
5.3-rc1 before I leave. If possible, please have a quick look over them 
while I am away for trivial changes or oopsies for me to fix, so that I 
can fire off another series ASAP, so that later when we do a full 
analysis, there are less problems.

Thank you!

Kind regards,

Nicholas Johnson


             reply index

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-07-24 12:54 Nicholas Johnson [this message]
2019-07-24 13:38 ` Bjorn Helgaas
2019-07-24 15:48   ` Logan Gunthorpe
2019-07-25 13:21     ` Nicholas Johnson
2019-07-25 13:18   ` Nicholas Johnson
2019-07-25 15:50     ` Logan Gunthorpe
2019-08-04  8:47       ` Nicholas Johnson
2019-08-05  8:59         ` Nicholas Johnson
2019-08-05 12:34         ` Mika Westerberg
2019-08-05 14:09           ` Nicholas Johnson
2019-08-05 14:25           ` Nicholas Johnson

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:

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

  git send-email \
    --in-reply-to=SL2P216MB01878BBCD75F21D882AEEA2880C60@SL2P216MB0187.KORP216.PROD.OUTLOOK.COM \ \ \ \ \ \ \

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

Linux-PCI Archive on

Archives are clonable:
	git clone --mirror linux-pci/git/0.git

	# If you have public-inbox 1.1+ installed, you may
	# initialize and index your mirror using the following commands:
	public-inbox-init -V2 linux-pci linux-pci/ \
	public-inbox-index linux-pci

Example config snippet for mirrors

Newsgroup available over NNTP:

AGPL code for this site: git clone