linux-kernel - Re: swapping in 2.6.24-rc5-git3

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Message-ID: <20071218105850.GA4249@ics.muni.cz>
Date:	Tue, 18 Dec 2007 11:58:50 +0100
From:	Lukas Hejtmanek <xhejtman@....muni.cz>
To:	Jan Kara <jack@...e.cz>
Cc:	linux-kernel@...r.kernel.org, kamezawa.hiroyu@...fujitsu.com
Subject: Re: swapping in 2.6.24-rc5-git3

On Mon, Dec 17, 2007 at 06:15:32PM +0100, Jan Kara wrote:
>   I think yes. 0 swappiness doesn't mean "no swapping at all". From the
> code in shrink_active_list() it seems that it just decreases likeliness
> of removing pages of mmaped files (i.e., also executables loaded in memory).

So, I tried to add some prints. 

I have mapped ratio about 78 while scp-ing the file. Distress suddenly raises
from 0 to 100. At this poing, all the processes are swapped out.

I guess it happens if scp is faster than the local disk which happens if
I scp-ing over GE from desktop (with fast disk - and reading) to laptop (slow
disk - and writing).

This is my settings.
/proc/sys/vm/*
block_dump:0
dirty_background_ratio:10
dirty_expire_centisecs:2999
dirty_ratio:40
dirty_writeback_centisecs:499
drop_caches:0
laptop_mode:0
legacy_va_layout:0
lowmem_reserve_ratio:256	256	32
max_map_count:65536
min_free_kbytes:4006
nr_pdflush_threads:2
oom_kill_allocating_task:0
overcommit_memory:0
overcommit_ratio:50
page-cluster:3
panic_on_oom:0
percpu_pagelist_fraction:0
stat_interval:1
swappiness:0
vfs_cache_pressure:100

-- 
Lukáš Hejtmánek
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