From: "heming.zhao@suse.com" <heming.zhao@suse.com>
To: David Teigland <teigland@redhat.com>,
"linux-lvm@redhat.com" <linux-lvm@redhat.com>
Cc: "rogerheflin@gmail.com" <rogerheflin@gmail.com>,
prajnoha@redhat.com, Martin Wilck <martin.wilck@suse.com>,
"zkabelac@redhat.com" <zkabelac@redhat.com>
Subject: Re: [linux-lvm] Discussion: performance issue on event activation mode
Date: Thu, 17 Jun 2021 00:18:47 +0800 [thread overview]
Message-ID: <ce60635c-320a-be17-4c9e-a6c6b1afdeba@suse.com> (raw)
In-Reply-To: <20210615170354.GA357@redhat.com>
On 6/16/21 1:03 AM, David Teigland wrote:
> On Tue, Jun 08, 2021 at 10:39:37AM -0500, David Teigland wrote:
>> I think it would be an improvement to:
>>
>> . Make obtain_device_list_from_udev only control how we get the device
>> list. Then we can easily default to 0 and readdir /dev if it's better.
>>
>> . Use both native md/mpath detection *and* udev info when it's readily
>> available (don't wait for it), instead of limiting ourselves to one
>> source of info. If either source indicates an md/mpath component,
>> then we consider it true.
>>
>> The second point means we are free to change obtain_device_list_from_udev
>> as we wish, without affecting md/mpath detection. It may also improve
>> md/mpath detection overall.
>
> Here are the initial patches I'm testing (libmpathvalid not yet added)
> https://sourceware.org/git/?p=lvm2.git;a=shortlog;h=refs/heads/dev-dct-device-info-1
>
I compiled & tested the code.
I don't know if I missed something, the result didn't show any progress.
the result of "devices/obtain_device_list_from_udev=0" even got regression: from 23.3 => 39.8
the lvm2 version with dev-dct-device-info-1 branch code
```
sle15sp2-base40g:~ # lvm version
LVM version: 2.03.13(2)-git (2021-05-07)
Library version: 1.02.179-git (2021-05-07)
Driver version: 4.40.0
Configuration: ./configure --host=x86_64-suse-linux-gnu --build=x86_64-suse-linux-gnu --program-prefix= --disable-dependency-tracking --prefix=/usr --exec-prefix=/usr --bindir=/usr/bin --sbindir=/usr/sbin --sysconfdir=/etc --datadir=/usr/share --includedir=/usr/include --libdir=/usr/lib64 --libexecdir=/usr/lib --localstatedir=/var --sharedstatedir=/var/lib --mandir=/usr/share/man --infodir=/usr/share/info --disable-dependency-tracking --enable-dmeventd --enable-cmdlib --enable-udev_rules --enable-udev_sync --with-udev-prefix=/usr/ --enable-selinux --enable-pkgconfig --with-usrlibdir=/usr/lib64 --with-usrsbindir=/usr/sbin --with-default-dm-run-dir=/run --with-tmpfilesdir=/usr/lib/tmpfiles.d --with-thin=internal --with-device-gid=6 --with-device-mode=0640 --with-device-uid=0 --with-dmeventd-path=/usr/sbin/dmeventd --with-thin-check=/usr/sbin/thin_check --with-thin-dump=/usr/sbin/thin_dump --with-thin-repair=/usr/sbin/thin_repair --enable-blkid_wiping --enable-lvmpolld --enable-rea
ltime --with-cache=internal --with-default-locking-dir=/run/lock/lvm --with-default-pid-dir=/run --with-default-run-dir=/run/lvm --enable-fsadm --disable-silent-rules --enable-write_install --with-vdo=none
```
Installation with cmd: make install && dracut -f --add "lvm"
top 10 blame services
```
external_device_info_source = "none"
obtain_device_list_from_udev = 1
event_activation = 1
udev_sync = 1
sle15sp2-base40g:~ # systemd-analyze blame | head -n 10
2min 4.515s lvm2-pvscan@135:720.service
2min 4.332s lvm2-pvscan@135:704.service
2min 3.162s lvm2-pvscan@8:768.service
2min 2.168s lvm2-pvscan@135:672.service
2min 2.166s lvm2-pvscan@135:688.service
1min 55.275s lvm2-pvscan@130:688.service
1min 52.541s lvm2-pvscan@135:656.service
1min 52.483s lvm2-pvscan@135:640.service
1min 51.066s lvm2-pvscan@128:688.service
1min 51.065s lvm2-pvscan@128:704.service
devices/obtain_device_list_from_udev=0
global/event_activation=1
activation/udev_sync=1
sle15sp2-base40g:~ # systemd-analyze blame | head -n 10
39.845s lvm2-pvscan@133:576.service
39.830s lvm2-pvscan@133:640.service
39.829s lvm2-pvscan@133:720.service
39.827s lvm2-pvscan@132:736.service
39.825s lvm2-pvscan@132:656.service
39.823s lvm2-pvscan@132:672.service
39.821s lvm2-pvscan@132:720.service
39.820s lvm2-pvscan@132:544.service
39.819s lvm2-pvscan@132:624.service
39.808s lvm2-pvscan@132:576.servic
```
*** compare with my previous test result. (list in below) ***
```
external_device_info_source = "none"
devices/obtain_device_list_from_udev=1
global/event_activation=1
activation/udev_sync=1
2min 6.736s lvm2-pvscan@70:384.service
2min 6.628s lvm2-pvscan@70:400.service
2min 6.554s lvm2-pvscan@69:432.service
2min 6.518s lvm2-pvscan@69:480.service
2min 6.478s lvm2-pvscan@69:416.service
2min 6.277s lvm2-pvscan@69:464.service
2min 5.791s lvm2-pvscan@69:544.service
devices/obtain_device_list_from_udev=0
global/event_activation=1
activation/udev_sync=1
34.908s dracut-initqueue.service
25.440s systemd-udev-settle.service
23.335s lvm2-pvscan@66:832.service
23.335s lvm2-pvscan@65:976.service
23.335s lvm2-pvscan@66:784.service
23.335s lvm2-pvscan@65:816.service
23.335s lvm2-pvscan@8:976.service
23.327s lvm2-pvscan@66:864.service
23.323s lvm2-pvscan@66:848.service
23.316s lvm2-pvscan@65:800.service
```
Thanks
Heming
_______________________________________________
linux-lvm mailing list
linux-lvm@redhat.com
https://listman.redhat.com/mailman/listinfo/linux-lvm
read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
next prev parent reply other threads:[~2021-06-16 16:22 UTC|newest]
Thread overview: 86+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-06-06 6:15 [linux-lvm] Discussion: performance issue on event activation mode heming.zhao
2021-06-06 16:35 ` Roger Heflin
2021-06-07 10:27 ` Martin Wilck
2021-06-07 15:30 ` heming.zhao
2021-06-07 15:45 ` Martin Wilck
2021-06-07 20:52 ` Roger Heflin
2021-06-07 21:30 ` David Teigland
2021-06-08 8:26 ` Martin Wilck
2021-06-08 15:39 ` David Teigland
2021-06-08 15:47 ` Martin Wilck
2021-06-08 16:02 ` Zdenek Kabelac
2021-06-08 16:05 ` Martin Wilck
2021-06-08 16:03 ` David Teigland
2021-06-08 16:07 ` Martin Wilck
2021-06-15 17:03 ` David Teigland
2021-06-15 18:21 ` Zdenek Kabelac
2021-06-16 16:18 ` heming.zhao [this message]
2021-06-16 16:38 ` David Teigland
2021-06-17 3:46 ` heming.zhao
2021-06-17 15:27 ` David Teigland
2021-06-08 16:49 ` heming.zhao
2021-06-08 16:18 ` heming.zhao
2021-06-09 4:01 ` heming.zhao
2021-06-09 5:37 ` Heming Zhao
2021-06-09 18:59 ` David Teigland
2021-06-10 17:23 ` heming.zhao
2021-06-07 15:48 ` Martin Wilck
2021-06-07 16:31 ` Zdenek Kabelac
2021-06-07 21:48 ` David Teigland
2021-06-08 12:29 ` Peter Rajnoha
2021-06-08 13:23 ` Martin Wilck
2021-06-08 13:41 ` Peter Rajnoha
2021-06-08 13:46 ` Zdenek Kabelac
2021-06-08 13:56 ` Peter Rajnoha
2021-06-08 14:23 ` Zdenek Kabelac
2021-06-08 14:48 ` Martin Wilck
2021-06-08 15:19 ` Peter Rajnoha
2021-06-08 15:39 ` Martin Wilck
2021-09-09 19:44 ` David Teigland
2021-09-10 17:38 ` Martin Wilck
2021-09-12 16:51 ` heming.zhao
2021-09-27 10:00 ` Peter Rajnoha
2021-09-27 15:38 ` David Teigland
2021-09-28 6:34 ` Martin Wilck
2021-09-28 14:42 ` David Teigland
2021-09-28 15:16 ` Martin Wilck
2021-09-28 15:31 ` Martin Wilck
2021-09-28 15:56 ` David Teigland
2021-09-28 18:03 ` Benjamin Marzinski
2021-09-28 17:42 ` Benjamin Marzinski
2021-09-28 19:15 ` Martin Wilck
2021-09-29 22:06 ` Peter Rajnoha
2021-09-30 7:51 ` Martin Wilck
2021-09-30 8:07 ` heming.zhao
2021-09-30 9:31 ` Martin Wilck
2021-09-30 11:41 ` Peter Rajnoha
2021-09-30 15:32 ` heming.zhao
2021-10-01 7:41 ` Martin Wilck
2021-10-01 8:08 ` Peter Rajnoha
2021-09-30 11:29 ` Peter Rajnoha
2021-09-30 16:04 ` David Teigland
2021-09-30 14:41 ` Benjamin Marzinski
2021-10-01 7:42 ` Martin Wilck
2021-09-29 21:53 ` Peter Rajnoha
2021-09-30 7:45 ` Martin Wilck
2021-09-29 21:39 ` Peter Rajnoha
2021-09-30 7:22 ` Martin Wilck
2021-09-30 14:26 ` David Teigland
2021-09-30 15:55 ` David Teigland
2021-10-01 8:00 ` Peter Rajnoha
2021-10-18 6:24 ` Martin Wilck
2021-10-18 15:04 ` David Teigland
2021-10-18 16:56 ` heming.zhao
2021-10-18 21:51 ` Zdenek Kabelac
2021-10-19 17:18 ` David Teigland
2021-10-20 14:40 ` Martin Wilck
2021-10-20 14:50 ` David Teigland
2021-10-20 14:54 ` Martin Wilck
2021-10-20 15:12 ` David Teigland
2021-06-07 16:40 ` David Teigland
2021-07-02 21:09 ` David Teigland
2021-07-02 21:22 ` Martin Wilck
2021-07-02 22:02 ` David Teigland
2021-07-03 11:49 ` heming.zhao
2021-07-08 10:10 ` Tom Yan
2021-07-02 21:31 ` Tom Yan
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=ce60635c-320a-be17-4c9e-a6c6b1afdeba@suse.com \
--to=heming.zhao@suse.com \
--cc=linux-lvm@redhat.com \
--cc=martin.wilck@suse.com \
--cc=prajnoha@redhat.com \
--cc=rogerheflin@gmail.com \
--cc=teigland@redhat.com \
--cc=zkabelac@redhat.com \
/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 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).