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tom!79
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Joined: 08 Jul 2014
Posts: 5

PostPosted: Wed Jul 09, 2014 7:46 pm    Post subject: Gentoo RapsberryPi eccessive lag in command execution Reply with quote

Hi all,
i recenly reinstalled gentoo on my raspberrypi, but i dunno why i have a sort of "lag" in terminal:

Eselect example:
Code:

myrasp ~ #: time eselect profile list
Available profile symlink targets:
  [1]   default/linux/arm/13.0
  [2]   default/linux/arm/13.0/desktop
  [3]   default/linux/arm/13.0/desktop/gnome
  [4]   default/linux/arm/13.0/desktop/gnome/systemd
  [5]   default/linux/arm/13.0/desktop/kde
  [6]   default/linux/arm/13.0/desktop/kde/systemd
  [7]   default/linux/arm/13.0/developer
  [8]   default/linux/arm/13.0/armv4
  [9]   default/linux/arm/13.0/armv4/desktop
  [10]  default/linux/arm/13.0/armv4/desktop/gnome
  [11]  default/linux/arm/13.0/armv4/desktop/kde
  [12]  default/linux/arm/13.0/armv4/developer
  [13]  default/linux/arm/13.0/armv4t
  [14]  default/linux/arm/13.0/armv4t/desktop
  [15]  default/linux/arm/13.0/armv4t/desktop/gnome
  [16]  default/linux/arm/13.0/armv4t/desktop/kde
  [17]  default/linux/arm/13.0/armv4t/developer
  [18]  default/linux/arm/13.0/armv5te
  [19]  default/linux/arm/13.0/armv5te/desktop
  [20]  default/linux/arm/13.0/armv5te/desktop/gnome
  [21]  default/linux/arm/13.0/armv5te/desktop/kde
  [22]  default/linux/arm/13.0/armv5te/developer
  [23]  default/linux/arm/13.0/armv6j *
  [24]  default/linux/arm/13.0/armv6j/desktop
  [25]  default/linux/arm/13.0/armv6j/desktop/gnome
  [26]  default/linux/arm/13.0/armv6j/desktop/kde
  [27]  default/linux/arm/13.0/armv6j/developer
  [28]  default/linux/arm/13.0/armv7a
  [29]  default/linux/arm/13.0/armv7a/desktop
  [30]  default/linux/arm/13.0/armv7a/desktop/gnome
  [31]  default/linux/arm/13.0/armv7a/desktop/kde
  [32]  default/linux/arm/13.0/armv7a/developer
  [33]  hardened/linux/arm/armv7a
  [34]  hardened/linux/arm/armv6j
  [35]  hardened/linux/uclibc/arm/armv7a
  [36]  hardened/linux/musl/arm/armv7a

real    1m15.929s
user    0m34.600s
sys     0m1.070s


After hitting enter to execute eselect, the systems seems hangs for about 40sec then do all as usual.Q

I followed the Quick Installation Guide, my SD card is a Kingstone MicroSD microSDHC/SDXC – UHS-I Class 10 32Gb

Raspberry Kernel is:
Code:
Linux version 3.12.23+ (dc4@dc4-Latitude-E6510) (gcc version 4.8.3 20140303 (prerelease) (crosstool-NG linaro-1.13.1+bzr2650 - Linaro GCC 2014.03) ) #692 PREEMPT Thu Jun 26 20:15:50 BST 2014


Partitions:
Code:
Disk /dev/mmcblk0: 29,9 GiB, 32090619904 bytes, 62676992 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: dos
Disk identifier: 0xf95114c3

Dispositivo    Avvio     Start      Fine   Blocks  Id System
/dev/mmcblk0p1            2048    206847   102400   c W95 FAT32 (LBA)
/dev/mmcblk0p2          206848   2254847  1024000  82 Linux swap / Solaris
/dev/mmcblk0p3         2254848  62676991 30211072  83 Linux


tune2fs info of root fs:

Code:
 
tune2fs -l /dev/mmcblk0p3
tune2fs 1.42.7 (21-Jan-2013)
Filesystem volume name:   <none>
Last mounted on:          /
Filesystem UUID:          b93fef38-cd29-4713-b383-2e629763559f
Filesystem magic number:  0xEF53
Filesystem revision #:    1 (dynamic)
Filesystem features:      has_journal ext_attr resize_inode dir_index filetype needs_recovery extent flex_bg sparse_super large_file huge_file uninit_bg dir_nlink extra_isize
Filesystem flags:         signed_directory_hash
Default mount options:    user_xattr acl
Filesystem state:         clean
Errors behavior:          Continue
Filesystem OS type:       Linux
Inode count:              1888656
Block count:              7552768
Reserved block count:     377638
Free blocks:              6898394
Free inodes:              1648894
First block:              0
Block size:               4096
Fragment size:            4096
Reserved GDT blocks:      1022
Blocks per group:         32768
Fragments per group:      32768
Inodes per group:         8176
Inode blocks per group:   511
Flex block group size:    16
Filesystem created:       Fri Jul  4 02:19:49 2014
Last mount time:          Thu Jan  1 01:00:19 1970
Last write time:          Thu Jan  1 01:00:19 1970
Mount count:              23
Maximum mount count:      -1
Last checked:             Fri Jul  4 02:19:49 2014
Check interval:           0 (<none>)
Lifetime writes:          6026 MB
Reserved blocks uid:      0 (user root)
Reserved blocks gid:      0 (group root)
First inode:              11
Inode size:               256
Required extra isize:     28
Desired extra isize:      28
Journal inode:            8
First orphan inode:       1180229
Default directory hash:   half_md4
Directory Hash Seed:      01b743a9-dcb8-4ad0-a3ae-9593f179e27a
Journal backup:           inode blocks


I suppose that's a fs bug, maybe i have done something wrong, any idea?
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roarinelk
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Joined: 04 Mar 2004
Posts: 444

PostPosted: Thu Jul 10, 2014 7:29 am    Post subject: Reply with quote

try to strace one of the slow commands, maybe you can find out which syscalls are
taking so long.
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tom!79
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Joined: 08 Jul 2014
Posts: 5

PostPosted: Thu Jul 10, 2014 9:07 am    Post subject: Reply with quote

Hi roarinelk, as you suggest you can find strace at the end of this post (my skill in reading that is = 0, the only thing that i have notice is a 36sec hang near the end of strace), this morning with a less workload this is the situation, even if is smaller the delay persists:

Code:

time eselect profile list
Available profile symlink targets:
  [1]   default/linux/arm/13.0
  [2]   default/linux/arm/13.0/desktop
  [3]   default/linux/arm/13.0/desktop/gnome
  [4]   default/linux/arm/13.0/desktop/gnome/systemd
  [5]   default/linux/arm/13.0/desktop/kde
  [6]   default/linux/arm/13.0/desktop/kde/systemd
  [7]   default/linux/arm/13.0/developer
  [8]   default/linux/arm/13.0/armv4
  [9]   default/linux/arm/13.0/armv4/desktop
  [10]  default/linux/arm/13.0/armv4/desktop/gnome
  [11]  default/linux/arm/13.0/armv4/desktop/kde
  [12]  default/linux/arm/13.0/armv4/developer
  [13]  default/linux/arm/13.0/armv4t
  [14]  default/linux/arm/13.0/armv4t/desktop
  [15]  default/linux/arm/13.0/armv4t/desktop/gnome
  [16]  default/linux/arm/13.0/armv4t/desktop/kde
  [17]  default/linux/arm/13.0/armv4t/developer
  [18]  default/linux/arm/13.0/armv5te
  [19]  default/linux/arm/13.0/armv5te/desktop
  [20]  default/linux/arm/13.0/armv5te/desktop/gnome
  [21]  default/linux/arm/13.0/armv5te/desktop/kde
  [22]  default/linux/arm/13.0/armv5te/developer
  [23]  default/linux/arm/13.0/armv6j *
  [24]  default/linux/arm/13.0/armv6j/desktop
  [25]  default/linux/arm/13.0/armv6j/desktop/gnome
  [26]  default/linux/arm/13.0/armv6j/desktop/kde
  [27]  default/linux/arm/13.0/armv6j/developer
  [28]  default/linux/arm/13.0/armv7a
  [29]  default/linux/arm/13.0/armv7a/desktop
  [30]  default/linux/arm/13.0/armv7a/desktop/gnome
  [31]  default/linux/arm/13.0/armv7a/desktop/kde
  [32]  default/linux/arm/13.0/armv7a/developer
  [33]  hardened/linux/arm/armv7a
  [34]  hardened/linux/arm/armv6j
  [35]  hardened/linux/uclibc/arm/armv7a
  [36]  hardened/linux/musl/arm/armv7a

real    0m37.289s
user    0m34.650s
sys     0m0.980s


Strace -tt eselect profile list :
Code:

10:46:22.109314 read(3, "/usr/share/eselect/modules/profi"..., 128) = 43
10:46:22.115020 read(3, "", 128)        = 0
10:46:22.117626 close(3)                = 0
10:46:22.118083 rt_sigprocmask(SIG_BLOCK, [CHLD], [], 8) = 0
10:46:22.118571 rt_sigaction(SIGINT, {0x3e448, [], 0x4000000 /* SA_??? */}, {SIG_DFL, [], 0x4000000 /* SA_??? */}, 8) = 0
10:46:22.119076 wait4(-1, [{WIFEXITED(s) && WEXITSTATUS(s) == 0}], 0, NULL) = 13613
10:46:22.119830 rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
10:46:22.120444 --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=13613, si_status=0, si_utime=0, si_stime=1} ---
10:46:22.120742 wait4(-1, 0xbea9a360, WNOHANG, NULL) = -1 ECHILD (No child processes)
10:46:22.121218 sigreturn() (mask [])   = 0
10:46:22.121697 rt_sigaction(SIGINT, {SIG_DFL, [], 0x4000000 /* SA_??? */}, {0x3e448, [], 0x4000000 /* SA_??? */}, 8) = 0
10:46:22.122511 rt_sigprocmask(SIG_BLOCK, [INT CHLD], [], 8) = 0
10:46:22.123027 rt_sigprocmask(SIG_BLOCK, [CHLD], [INT CHLD], 8) = 0
10:46:22.123595 rt_sigprocmask(SIG_SETMASK, [INT CHLD], NULL, 8) = 0
10:46:22.124060 clone(child_stack=0, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0xb6d40068) = 13614
10:46:22.125413 rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
10:46:22.125936 rt_sigprocmask(SIG_BLOCK, [CHLD], [], 8) = 0
10:46:22.126575 rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
10:46:22.127050 rt_sigprocmask(SIG_BLOCK, [CHLD], [], 8) = 0
10:46:22.127628 rt_sigaction(SIGINT, {0x3e448, [], 0x4000000 /* SA_??? */}, {SIG_DFL, [], 0x4000000 /* SA_??? */}, 8) = 0
10:46:22.130563 wait4(-1, [{WIFEXITED(s) && WEXITSTATUS(s) == 0}], 0, NULL) = 13614
10:46:58.900656 rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
10:46:58.901180 --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=13614, si_status=0, si_utime=40, si_stime=22} ---
10:46:58.901490 wait4(-1, 0xbea9a818, WNOHANG, NULL) = -1 ECHILD (No child processes)
10:46:58.901924 sigreturn() (mask [HUP INT]) = 0
10:46:58.902474 rt_sigaction(SIGINT, {SIG_DFL, [], 0x4000000 /* SA_??? */}, {0x3e448, [], 0x4000000 /* SA_??? */}, 8) = 0
10:46:58.903350 rt_sigprocmask(SIG_BLOCK, NULL, [], 8) = 0
10:46:58.903860 rt_sigprocmask(SIG_BLOCK, NULL, [], 8) = 0
10:46:58.904430 read(255, "", 4450)     = 0
10:46:58.905191 exit_group(0)           = ?
10:46:58.906295 +++ exited with 0 +++


FULL REPORT ON PASTEBIN: http://pastebin.com/acmaFiLH
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Ant P.
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Joined: 18 Apr 2009
Posts: 2374
Location: UK

PostPosted: Sat Jul 12, 2014 2:19 am    Post subject: Reply with quote

You'll need to rerun that with strace -f or strace -ff, it looks like the delay is in a child process.

Just a random guess: a delay of 30 seconds might be something network-related.
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tom!79
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Joined: 08 Jul 2014
Posts: 5

PostPosted: Sat Jul 12, 2014 6:46 pm    Post subject: Reply with quote

Hi Ant,

i have done a strace -tt -f eselect profile list, the output is too high, so pastebin don't allow me to copy that online, i have zipped the output text here:
eselectstraceff2.zip
or
eselectstraceff2.bz2
or
eselectstraceff2.tar.gz

Ty T.
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freke
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Joined: 23 Jan 2003
Posts: 146

PostPosted: Wed Jul 23, 2014 7:40 pm    Post subject: Reply with quote

No clue on how to read those straces :(

Do you experience same lag executing other commands - eselect profile list takes about the same time on my Raspberry Pi, but I don't generally feel like I'm getting eccessive lag.
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XavierMiller
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Joined: 23 Jul 2004
Posts: 5542
Location: ~Brussels - Belgique

PostPosted: Wed Jul 23, 2014 10:03 pm    Post subject: Reply with quote

With a USB hard drive and portage in a squashed filesystem:
Code:
real    0m33.564s
user    0m30.488s
sys     0m1.937s


The SD card performance are really bad. Try to put / on a USB hard drive ;)
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