[Samba] Aplication slow after migration

[Scott Lovenberg]

On Feb 1, 2008 7:38 AM, Felipe Martinez Hermo <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
> fmartinez at galicia.ugt.org
> ==============================
> Servicios Informáticos
> UGT Galicia
> informatica at galicia.ugt.org
> 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