[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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