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Bug 511828 - ZFS requires a significantly higher CPU usage on sys-kernel/gentoo-sources-3.14 vs sys-kernel/gentoo-sources-3.12
Summary: ZFS requires a significantly higher CPU usage on sys-kernel/gentoo-sources-3....
Status: RESOLVED OBSOLETE
Alias: None
Product: Gentoo Linux
Classification: Unclassified
Component: [OLD] Core system (show other bugs)
Hardware: All Linux
: Normal normal (vote)
Assignee: Richard Yao (RETIRED)
URL:
Whiteboard:
Keywords:
Depends on:
Blocks:
 
Reported: 2014-05-30 05:28 UTC by James Chew
Modified: 2014-12-01 08:19 UTC (History)
2 users (show)

See Also:
Package list:
Runtime testing required: ---


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Description James Chew 2014-05-30 05:28:25 UTC
I ran bonnie++ sessions on the same hardware with no other load. When kernel 3.14 is used, ZFS always uses a significantly higher amount of CPU time. The block writes higher CPU usage is not as significant as the block reads higher CPU usage.

When running on sys-kernel/gentoo-sources-3.12.20:
# bonnie++ -u nobody:nobody -d /mnt/shares/Unsorted/
Using uid:65534, gid:65534.
Writing a byte at a time...done
Writing intelligently...done
Rewriting...done
Reading a byte at a time...done
Reading intelligently...done
start 'em...done...done...done...done...done...
Create files in sequential order...done.
Stat files in sequential order...done.
Delete files in sequential order...done.
Create files in random order...done.
Stat files in random order...done.
Delete files in random order...done.
Version  1.97       ------Sequential Output------ --Sequential Input- --Random-
Concurrency   1     -Per Chr- --Block-- -Rewrite- -Per Chr- --Block-- --Seeks--
Machine        Size K/sec %CP K/sec %CP K/sec %CP K/sec %CP K/sec %CP  /sec %CP
raptor          63G   262  99 383409  26 191400  18   641  98 416550  15 207.4   6
Latency             43499us   10945us    1142ms   56359us     138ms     204ms
Version  1.97       ------Sequential Create------ --------Random Create--------
raptor              -Create-- --Read--- -Delete-- -Create-- --Read--- -Delete--
              files  /sec %CP  /sec %CP  /sec %CP  /sec %CP  /sec %CP  /sec %CP
                 16 27609  65 +++++ +++ +++++ +++ 30715  90 +++++ +++ 11182  98
Latency             16613us     195us     212us   27817us      34us    1374us
1.97,1.97,raptor,1,1401392075,63G,,262,99,383409,26,191400,18,641,98,416550,15,207.4,6,16,,,,,27609,65,+++++,+++,+++++,+++,30715,90,+++++,+++,11182,98,43499us,10945us,1142ms,56359us,138ms,204ms,16613us,195us,212us,27817us,34us,1374us

When running on sys-kernel/gentoo-sources-3.14.4:
# bonnie++ -u nobody:nobody -d /mnt/shares/Unsorted/
Using uid:65534, gid:65534.
Writing a byte at a time...done
Writing intelligently...done
Rewriting...done
Reading a byte at a time...done
Reading intelligently...done
start 'em...done...done...done...done...done...
Create files in sequential order...done.
Stat files in sequential order...done.
Delete files in sequential order...done.
Create files in random order...done.
Stat files in random order...done.
Delete files in random order...done.
Version  1.97       ------Sequential Output------ --Sequential Input- --Random-
Concurrency   1     -Per Chr- --Block-- -Rewrite- -Per Chr- --Block-- --Seeks--
Machine        Size K/sec %CP K/sec %CP K/sec %CP K/sec %CP K/sec %CP  /sec %CP
raptor          63G   240  99 380045  35 157276  39   636  97 392856  51 203.0  16
Latency             90298us   12378us    1056ms     102ms     129ms     208ms
Version  1.97       ------Sequential Create------ --------Random Create--------
raptor              -Create-- --Read--- -Delete-- -Create-- --Read--- -Delete--
              files  /sec %CP  /sec %CP  /sec %CP  /sec %CP  /sec %CP  /sec %CP
                 16 13630  79 +++++ +++ 29622  89 27174  84 +++++ +++ 20515  92
Latency             25627us     606us     447us   20030us      11us     229us
1.97,1.97,raptor,1,1401388077,63G,,240,99,380045,35,157276,39,636,97,392856,51,203.0,16,16,,,,,13630,79,+++++,+++,29622,89,27174,84,+++++,+++,20515,92,90298us,12378us,1056ms,102ms,129ms,208ms,25627us,606us,447us,20030us,11us,229us


Reproducible: Always
Comment 1 James Chew 2014-05-30 05:29:23 UTC
# emerge --info
Portage 2.2.10 (default/linux/amd64/13.0/no-multilib, gcc-4.8.2, glibc-2.19, 3.12.20-gentoo x86_64)
=================================================================
System uname: Linux-3.12.20-gentoo-x86_64-Intel-R-_Xeon-R-_CPU_E3-1240_v3_@_3.40GHz-with-gentoo-2.2
KiB Mem:    32929260 total,  11232772 free
KiB Swap:   15625212 total,  15625212 free
Timestamp of tree: Thu, 29 May 2014 19:00:01 +0000
ld GNU ld (GNU Binutils) 2.24
app-shells/bash:          4.2_p47
dev-lang/python:          2.7.6-r1, 3.3.5, 3.4.0
dev-util/pkgconfig:       0.28-r1
sys-apps/baselayout:      2.2
sys-apps/openrc:          0.12.4
sys-apps/sandbox:         2.6-r1
sys-devel/autoconf:       2.13, 2.69
sys-devel/automake:       1.11.6, 1.14.1
sys-devel/binutils:       2.24-r2
sys-devel/gcc:            4.8.2
sys-devel/gcc-config:     1.8
sys-devel/libtool:        2.4.2-r1
sys-devel/make:           4.0-r1
sys-kernel/linux-headers: 3.12 (virtual/os-headers)
sys-libs/glibc:           2.19
Repositories: gentoo Personal_Portage
ACCEPT_KEYWORDS="amd64 ~amd64"
ACCEPT_LICENSE="* -@EULA"
CBUILD="x86_64-pc-linux-gnu"
CFLAGS="-march=native -O2 -pipe"
CHOST="x86_64-pc-linux-gnu"
CONFIG_PROTECT="/etc /usr/share/gnupg/qualified.txt"
CONFIG_PROTECT_MASK="/etc/ca-certificates.conf /etc/env.d /etc/gconf /etc/gentoo-release /etc/revdep-rebuild /etc/sandbox.d /etc/terminfo"
CXXFLAGS="-march=native -O2 -pipe"
DISTDIR="/usr/portage/distfiles"
FCFLAGS="-O2 -pipe"
FEATURES="assume-digests binpkg-logs config-protect-if-modified distlocks ebuild-locks fixlafiles merge-sync news parallel-fetch preserve-libs protect-owned sandbox sfperms strict unknown-features-warn unmerge-logs unmerge-orphans userfetch userpriv usersandbox usersync"
FFLAGS="-O2 -pipe"
GENTOO_MIRRORS="http://gentoo.channelx.biz/ http://gentoo.gg3.net/ http://ftp.iij.ad.jp/pub/linux/gentoo/ http://ftp.jaist.ac.jp/pub/Linux/Gentoo/"
LANG="en_US"
LDFLAGS="-Wl,-O1 -Wl,--as-needed"
MAKEOPTS="-j5"
PKGDIR="/usr/portage/packages"
PORTAGE_CONFIGROOT="/"
PORTAGE_RSYNC_OPTS="--recursive --links --safe-links --perms --times --omit-dir-times --compress --force --whole-file --delete --stats --human-readable --timeout=180 --exclude=/distfiles --exclude=/local --exclude=/packages"
PORTAGE_TMPDIR="/var/tmp"
PORTDIR="/usr/portage"
PORTDIR_OVERLAY="/var/lib/personal_portage"
SYNC="rsync://nexus/gentoo-portage"
USE="acl acpi amd64 berkdb bzip2 cli cracklib crypt cxx dri fortran gdbm iconv ipv6 lm_sensors mmx modules ncurses nls nptl openmp pam pcre readline samba session sse sse2 sse3 ssl ssse3 tcpd threads unicode zlib" ABI_X86="64" ALSA_CARDS="ali5451 als4000 atiixp atiixp-modem bt87x ca0106 cmipci emu10k1x ens1370 ens1371 es1938 es1968 fm801 hda-intel intel8x0 intel8x0m maestro3 trident usb-audio via82xx via82xx-modem ymfpci" APACHE2_MODULES="authn_core authz_core socache_shmcb unixd actions alias auth_basic authn_alias authn_anon authn_dbm authn_default authn_file authz_dbm authz_default authz_groupfile authz_host authz_owner authz_user autoindex cache cgi cgid dav dav_fs dav_lock deflate dir disk_cache env expires ext_filter file_cache filter headers include info log_config logio mem_cache mime mime_magic negotiation rewrite setenvif speling status unique_id userdir usertrack vhost_alias" CALLIGRA_FEATURES="kexi words flow plan sheets stage tables krita karbon braindump author" CAMERAS="ptp2" COLLECTD_PLUGINS="df interface irq load memory rrdtool swap syslog" ELIBC="glibc" GPSD_PROTOCOLS="ashtech aivdm earthmate evermore fv18 garmin garmintxt gpsclock itrax mtk3301 nmea ntrip navcom oceanserver oldstyle oncore rtcm104v2 rtcm104v3 sirf superstar2 timing tsip tripmate tnt ublox ubx" INPUT_DEVICES="keyboard mouse evdev" KERNEL="linux" LCD_DEVICES="bayrad cfontz cfontz633 glk hd44780 lb216 lcdm001 mtxorb ncurses text" LIBREOFFICE_EXTENSIONS="presenter-console presenter-minimizer" OFFICE_IMPLEMENTATION="libreoffice" PHP_TARGETS="php5-5" PYTHON_SINGLE_TARGET="python2_7" PYTHON_TARGETS="python2_7 python3_3" RUBY_TARGETS="ruby19 ruby20" USERLAND="GNU" VIDEO_CARDS="fbdev glint intel mach64 mga nouveau nv r128 radeon savage sis tdfx trident vesa via vmware dummy v4l" XTABLES_ADDONS="quota2 psd pknock lscan length2 ipv4options ipset ipp2p iface geoip fuzzy condition tee tarpit sysrq steal rawnat logmark ipmark dhcpmac delude chaos account"
Unset:  CPPFLAGS, CTARGET, EMERGE_DEFAULT_OPTS, INSTALL_MASK, LC_ALL, PORTAGE_BUNZIP2_COMMAND, PORTAGE_COMPRESS, PORTAGE_COMPRESS_FLAGS, PORTAGE_RSYNC_EXTRA_OPTS, USE_PYTHON
Comment 2 James Chew 2014-06-06 19:06:30 UTC
I just realised I didn't show what my ZFS pool is like...

# zpool status
  pool: shares
 state: ONLINE
  scan: scrub repaired 0 in 7h16m with 0 errors on Sun Jun  1 12:47:14 2014
config:

        NAME                                            STATE     READ WRITE CKSUM
        shares                                          ONLINE       0     0     0
          raidz1-0                                      ONLINE       0     0     0
            ata-WDC_WD4000F9YZ-09N20L0_WD-WCC130745847  ONLINE       0     0     0
            ata-WDC_WD4000F9YZ-09N20L0_WD-WCC130685393  ONLINE       0     0     0
            ata-WDC_WD4000F9YZ-09N20L0_WD-WCC130745037  ONLINE       0     0     0
            ata-WDC_WD4000F9YZ-09N20L0_WD-WCC130681302  ONLINE       0     0     0
            ata-WDC_WD4000F9YZ-09N20L0_WD-WCC1F0040763  ONLINE       0     0     0

errors: No known data errors
Comment 3 James Chew 2014-06-22 11:23:17 UTC
Performance numbers using zfs-0.63 with Kernel 3.15.1 is a lot better.

# bonnie++ -u nobody:nobody -d /mnt/shares/Unsorted/
Using uid:65534, gid:65534.
Writing a byte at a time...done
Writing intelligently...done
Rewriting...done
Reading a byte at a time...done
Reading intelligently...done
start 'em...done...done...done...done...done...
Create files in sequential order...done.
Stat files in sequential order...done.
Delete files in sequential order...done.
Create files in random order...done.
Stat files in random order...done.
Delete files in random order...done.
Version  1.97       ------Sequential Output------ --Sequential Input- --Random-
Concurrency   1     -Per Chr- --Block-- -Rewrite- -Per Chr- --Block-- --Seeks--
Machine        Size K/sec %CP K/sec %CP K/sec %CP K/sec %CP K/sec %CP  /sec %CP
raptor          63G   273  99 519141  42 205483  20   684  99 579338  20 259.9   7
Latency             41524us    8002us     747ms   35577us     136ms     173ms
Version  1.97       ------Sequential Create------ --------Random Create--------
raptor              -Create-- --Read--- -Delete-- -Create-- --Read--- -Delete--
              files  /sec %CP  /sec %CP  /sec %CP  /sec %CP  /sec %CP  /sec %CP
                 16 +++++ +++ +++++ +++ +++++ +++ 24224  88 +++++ +++ +++++ +++
Latency             21284us     236us     267us   31764us      12us     144us
1.97,1.97,raptor,1,1403434203,63G,,273,99,519141,42,205483,20,684,99,579338,20,259.9,7,16,,,,,+++++,+++,+++++,+++,+++++,+++,24224,88,+++++,+++,+++++,+++,41524us,8002us,747ms,35577us,136ms,173ms,21284us,236us,267us,31764us,12us,144us
Comment 4 Richard Yao (RETIRED) gentoo-dev 2014-12-01 08:19:16 UTC
Unfortunately, this issue fell through the cracks. I just tagged 0.6.3-r1, which has some fixes that should help further. I am closing this as obsolete. Feel free to reopen it if it is still a problem.