On Mon, Sep 10, 2012 at 10:07 AM, Shentino <shentino@xxxxxxxxx> wrote:
> On Mon, Sep 10, 2012 at 6:36 AM, Cong Wang <xiyou.wangcong@xxxxxxxxx> wrote:
>> On Sun, 09 Sep 2012 at 18:03 GMT, Shentino <shentino@xxxxxxxxx> wrote:
>>>
>>> Just curious, but what theoretically would happen if someone were to
>>> want to set swappiness to 200 or something?
>>>
>>> Should it be sorta like vfs_cache_pressure?
>>>
>>
>>
>> How could it be set to 200? As 0~100 is valid:
>>
>> {
>> .procname = "swappiness",
>> .data = &vm_swappiness,
>> .maxlen = sizeof(vm_swappiness),
>> .mode = 0644,
>> .proc_handler = proc_dointvec_minmax,
>> .extra1 = &zero,
>> .extra2 = &one_hundred,
>> },
>
> My comment/question was more abstract and focusing on the comparison
> to vfs_cache_pressure.
Just to be clear about what I meant.
Both swapping and reclaiming from dentry/inode caches both share the
common factor of being alternatives to reclaiming from page cache when
memory is tight.
So I was wondering how similiar in effect these two knobs should be.
One possible use case off the top of my head is a file server that
banks heavily on page cache and spends most of its runtime sending
file data over the network. It might be overkill but swappiness > 100
might actually be beneficial here. I have no numbers to back it up
though as it's a rough idea.
Sorry if I'm butting in on the subject but I was curious about the idea.
Also still learning how to pos tin general on the kernel lists, so
apologies if I've been rude or anything.
>
> :P
>>
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