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tom!79
n00b
Joined: 08 Jul 2014
Posts: 12
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 Posted: Wed Jul 09, 2014 7:46 pm Post subject: Gentoo RapsberryPi eccessive lag in command execution |
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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
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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
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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
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I suppose that's a fs bug, maybe i have done something wrong, any idea? |
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roarinelk
Guru
Joined: 04 Mar 2004
Posts: 520
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| Posted: Thu Jul 10, 2014 7:29 am Post subject: |
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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
n00b
Joined: 08 Jul 2014
Posts: 12
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| Posted: Thu Jul 10, 2014 9:07 am Post subject: |
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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
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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 +++
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FULL REPORT ON PASTEBIN: http://pastebin.com/acmaFiLH |
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Ant P.
Watchman
Joined: 18 Apr 2009
Posts: 6920
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| Posted: Sat Jul 12, 2014 2:19 am Post subject: |
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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
n00b
Joined: 08 Jul 2014
Posts: 12
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freke
Veteran
Joined: 23 Jan 2003
Posts: 1040
Location: Somewhere in Denmark
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| Posted: Wed Jul 23, 2014 7:40 pm Post subject: |
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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
Bodhisattva
Joined: 23 Jul 2004
Posts: 8723
Location: ~Brussels - Belgique
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| Posted: Wed Jul 23, 2014 10:03 pm Post subject: |
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With a USB hard drive and portage in a squashed filesystem:
| Code: | real 0m33.564s
user 0m30.488s
sys 0m1.937s
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The SD card performance are really bad. Try to put / on a USB hard drive 
_________________
Kind regards,
Xavier Miller |
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tom!79
n00b
Joined: 08 Jul 2014
Posts: 12
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| Posted: Tue Dec 09, 2014 2:37 pm Post subject: |
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I'm googling around looking for something about this problem, but i still haven't found a solution so...
To show better what i mean, a made this video.
(i'm sorry but i was hurry and i uploaded it whiout editing)
Look how much time passes between pressing the enter key and the start of the progam:
https://www.youtube.com/watch?v=NgjQSLe6fbU
Just see and tell me if is normal or not, thank you
I can do other test, if u want.
@xaviermiller
I need that raspberrypi use only a sd card no other device (maybe you are right with an external hdd or ssd over usb i maybe get better performance, if the problem is i/o access time, but for my needs i can't use that solution) |
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