2.6.6-1.435: kswapd clears out cache?
Mike Fedyk
mfedyk at matchmail.com
Mon Jun 28 20:44:20 UTC 2004
Philip Molter wrote:
>> What type of workload does your application produce?
>>
>> Are you mounting and unmounting drives all of the time? That can show
>> the behaviour you're describing... Maybe you don't want the
>> automounter turned on on your server. Maybe you just need to set a
>> longer timeout...
>
>
> No.
>
> I actually also filed the same bug over at bugzilla.kernel.org and
> Andrew Morton informs me that it has to do with the SMP/NUMA code and
> the 4G/4G boundary. By passing a mem=3936MB option to the kernel at
> boot time, the problem with the filesystem cache getting wiped out goes
> away.
>
> Bug #2973 if anyone's interested in his explanation (which I don't do
> justice since I'm not a kernel VM coder).
You really might want to turn on the swap.
In 2.4 you don't have the 4/4g split, and have a 1g/3g split. That is a
very different memory zone balancing situation than 4g/300MB you're
running the 2.6 kernel under.
Unless you're happy with not using 300MB on your server...
Mike
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