[Samba] Aplication slow after migration
Scott Lovenberg
scott.lovenberg at gmail.com
Fri Feb 1 14:55:30 GMT 2008
Scott Lovenberg wrote:
>
>
> On Feb 1, 2008 7:38 AM, Felipe Martinez Hermo <felipe at galicia.ugt.org
> <mailto:felipe at galicia.ugt.org>> wrote:
>
> I've got vfs_cache_pressure = 100 on both servers and ext3 filesystems
> on both.
> These are the files on /proc/sys/vm:
>
> slow server:
> ========
> file
> value
> -rw-r--r-- 1 root root 0 2008-02-01 13:31 block_dump
> -rw-r--r-- 1 root root 0 2008-02-01 13:31 dirty_background_ratio
> -rw-r--r-- 1 root root 0 2008-02-01 13:31 dirty_expire_centisecs
> -rw-r--r-- 1 root root 0 2008-02-01 13:31 dirty_ratio
> -rw-r--r-- 1 root root 0 2008-02-01 13:31 dirty_writeback_centisecs
> -rw-r--r-- 1 root root 0 2008-02-01 13:31 drop_caches
> -rw-r--r-- 1 root root 0 2008-02-01 13:31 laptop_mode
> -rw-r--r-- 1 root root 0 2008-02-01 13:31 legacy_va_layout
> -rw-r--r-- 1 root root 0 2008-02-01 13:31 lowmem_reserve_ratio
> -rw-r--r-- 1 root root 0 2008-02-01 13:31 max_map_count
> -rw-r--r-- 1 root root 0 2008-02-01 13:31 min_free_kbytes
> -r--r--r-- 1 root root 0 2008-02-01 13:31 nr_pdflush_threads
> -rw-r--r-- 1 root root 0 2008-02-01 13:31 overcommit_memory
> -rw-r--r-- 1 root root 0 2008-02-01 13:31 overcommit_ratio
> -rw-r--r-- 1 root root 0 2008-02-01 13:31 page-cluster
> -rw-r--r-- 1 root root 0 2008-02-01 13:31 panic_on_oom
> -rw-r--r-- 1 root root 0 2008-02-01 13:31 percpu_pagelist_fraction
> -rw-r--r-- 1 root root 0 2008-02-01 13:31 swappiness
> -rw-r--r-- 1 root root 0 2008-02-01 13:31 swap_token_timeout
> -rw-r--r-- 1 root root 0 2008-02-01 13:31 vdso_enabled
> -rw-r--r-- 1 root root 0 2008-02-01 13:31 vfs_cache_pressure 0
> 10
> 3000
> 40
> 500
> 0
> 0
> 0
> 256 256 32
> 65536
> 3831
> 2
> 0
> 50
> 3
> 0
> 0
> 60
> 300
> 1
> 100
>
>
>
> Fast server:
> ========
> file
> value
> -rw-r--r-- 1 root root 0 2008-02-01 13:32 block_dump
> -rw-r--r-- 1 root root 0 2008-02-01 13:32 dirty_background_ratio
> -rw-r--r-- 1 root root 0 2008-02-01 13:32 dirty_expire_centisecs
> -rw-r--r-- 1 root root 0 2008-02-01 13:32 dirty_ratio
> -rw-r--r-- 1 root root 0 2008-02-01 13:32 dirty_writeback_centisecs
> -rw-r--r-- 1 root root 0 2008-02-01 13:32 laptop_mode
> -rw-r--r-- 1 root root 0 2008-02-01 13:32 lower_zone_protection
> -rw-r--r-- 1 root root 0 2008-02-01 13:32 max_map_count
> -rw-r--r-- 1 root root 0 2008-02-01 13:32 min_free_kbytes
> -r--r--r-- 1 root root 0 2008-02-01 13:32 nr_pdflush_threads
> -rw-r--r-- 1 root root 0 2008-02-01 13:32 overcommit_memory
> -rw-r--r-- 1 root root 0 2008-02-01 13:32 overcommit_ratio
> -rw-r--r-- 1 root root 0 2008-02-01 13:32 page-cluster
> -rw-r--r-- 1 root root 0 2008-02-01 13:32 swappiness
> -rw-r--r-- 1 root root 0 2008-02-01 13:32 vfs_cache_pressure 0
> 10
> 3000
> 40
> 500
> 0
> 0
> 65536
> 957
> 2
> 0
> 50
> 3
> 60
> 100
>
>
>
>
>
> Scott Lovenberg escribió:
> > Felipe Martinez Hermo wrote:
> >>
> >>
> >>
> >> Hi, everybody!
> >>
> >> I have been using samab on Debian for years and I have recently
> >> migrated my file server from version 3.0.14a-3sarge2 to
> 3.0.24-6etch4.
> >> One or our applications stores its data in a shared folder.
> This data
> >> is distributed in over 29000 files of about 1k-40k and is so much
> >> slower when it runs on the new server.
> >>
> >> I have thoroughly revised both smb.conf files, but can't see
> >> significant differences. I have read them so much that probably I'm
> >> already obfuscated.
> >>
> >> I have tuned socket options, but can't see any improvement.
> >> Any ideas?
> >>
> >> Thanks in advance
> >>
> > how are your settings in /proc/sys/vm/*? If you've got the RAM,
> turn
> > down the vfs_cache_pressure - you should get more hits. Also, what
> > file system are you using?
>
> --
> ==============================
> Felipe Martínez Hermo
> felipe at galicia.ugt.org <mailto:felipe at galicia.ugt.org>
> fmartinez at galicia.ugt.org <mailto:fmartinez at galicia.ugt.org>
> ==============================
> Servicios Informáticos
> UGT Galicia
> informatica at galicia.ugt.org <mailto:informatica at galicia.ugt.org>
> ugtgalicia at gmail.com <mailto:ugtgalicia at gmail.com>
> ==============================
> --
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>
> OK, so we're apples to apples, so to speak; the servers are tuned the
> same. I'll assume your disks are tuned from hdparm and up to snuff,
> otherwise you wouldn't be tuning sockets ;). Did your old server have
> samba settings for oplocks set?
>
>
> --
> Peace and Blessings,
> -Scott.
>
> "Of course, that's just my opinion; I could be wrong"
> -Dennis Miller
Erm, sorry, I didn't catch that you had 2 .conf files there. I'm back
to the drawing board. Sorry about that. Anyone else have any ideas?
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