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From: Nicholas Johnson <nicholas.johnson-opensource@outlook.com.au>
To: Bjorn Helgaas <helgaas@kernel.org>
Cc: Logan Gunthorpe <logang@deltatee.com>,
	Benjamin Herrenschmidt <benh@kernel.crashing.org>,
	Mika Westerberg <mika.westerberg@linux.intel.com>,
	"linux-pci@vger.kernel.org" <linux-pci@vger.kernel.org>
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 
why.

$ uname -r
5.3.0-050300rc1-generic
$ 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

[1]
https://kernel.ubuntu.com/~kernel-ppa/mainline/v5.3-rc1/

             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

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