linux-kernel - Re: 2.6.28-rc8 big regression in VM

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Message-ID: <494818BC.6050505@tmr.com>
Date:	Tue, 16 Dec 2008 16:08:12 -0500
From:	Bill Davidsen <davidsen@....com>
To:	Wu Fengguang <fengguang.wu@...el.com>
CC:	Lukas Hejtmanek <xhejtman@....muni.cz>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: 2.6.28-rc8 big regression in VM

KVMWu Fengguang wrote:
> On Sat, Dec 13, 2008 at 11:58:15AM +0200, Lukas Hejtmanek wrote:
>> On Sat, Dec 13, 2008 at 09:21:15AM +0800, Wu Fengguang wrote:
>>> I cannot reproduce it on 2.6.28-rc7, compiling 2.6.28-rc8...
>>>
>>> # free; echo 3 > /proc/sys/vm/drop_caches; free
>>>              total       used       free     shared    buffers     cached
>>> Mem:          1940        109       1831          0          0         42
>>> -/+ buffers/cache:         66       1873
>>> Swap:            0          0          0
>>>              total       used       free     shared    buffers     cached
>>> Mem:          1940         62       1877          0          0          7
>>> -/+ buffers/cache:         55       1884
>>> Swap:            0          0          0
>>>
>>>> once the whole memory is eaten by the cache, the system is pretty unusable.
>>> What's your kconfig?
>> attached.
> 
> OK I'll try it. I cannot produce the bug in my -rc8 configuration yet:
> 
> # free; echo 3 > /proc/sys/vm/drop_caches; free
>              total       used       free     shared    buffers     cached
> Mem:          1940        906       1033          0          0        761
> -/+ buffers/cache:        144       1795
> Swap:            0          0          0
>              total       used       free     shared    buffers     cached
> Mem:          1940        147       1793          0          0         19
> -/+ buffers/cache:        127       1813
> Swap:            0          0          0
> 

Could the problem be related to him running 2GB memory and you running... well, 
maybe a patches version of "free?" Or can you really run in 2MB, or am I misreading?

-- 
Bill Davidsen <davidsen@....com>
   "We have more to fear from the bungling of the incompetent than from
the machinations of the wicked."  - from Slashdot
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