Re: [PATCH 0/4] Reclaim page capture v4

[MinChan Kim]

On Fri, Oct 3, 2008 at 3:48 PM, KOSAKI Motohiro
<kosaki.motohiro@xxxxxxxxxxxxxx> wrote:
>> Hi, Andy.
>>
>> I tested your patch in my desktop.
>> The test is just kernel compile with single thread.
>> My system environment is as follows.
>>
>> model name    : Intel(R) Core(TM)2 Quad CPU    Q6600  @ 2.40GHz
>> MemTotal:        2065856 kB
>>
>> When I tested vanilla, compile time is as follows.
>>
>> 2433.53user 187.96system 42:05.99elapsed 103%CPU (0avgtext+0avgdata
>> 0maxresident)k
>> 588752inputs+4503408outputs (127major+55456246minor)pagefaults 0swaps
>>
>> When I tested your patch, as follows.
>>
>> 2489.63user 202.41system 44:47.71elapsed 100%CPU (0avgtext+0avgdata
>> 0maxresident)k
>> 538608inputs+4503928outputs (130major+55531561minor)pagefaults 0swaps
>>
>> Regresstion almost is above 2 minutes.
>> Do you think It is a trivial?
>
> Ooops.
> this is definitly significant regression.
>
>
>> I know your patch is good to allocate hugepage.
>> But, I think many users don't need it, including embedded system and
>> desktop users yet.
>>
>> So I suggest you made it enable optionally.
>
> No.
> if the patch has this significant regression,
> nobody turn on its option.
>
> We should fix that.

I have been tested it.
But I can't reproduce such as regression.
I don't know why such regression happed at that time.

Sorry for confusing.
Please ignore my test result at that time.

This is new test result.

before

2346.24user 191.44system 42:07.28elapsed 100%CPU (0avgtext+0avgdata
0maxresident)k
458624inputs+4262728outputs (183major+52299730minor)pagefaults 0swaps


after

2349.75user 195.72system 42:16.36elapsed 100%CPU (0avgtext+0avgdata
0maxresident)k
475632inputs+4265208outputs (183major+52308969minor)pagefaults 0swaps

I think we can ignore some time gap.
Sometime, after is faster than before.

I could conclude it doesn't have any regressions in my desktop machine.

Tested-by: MinChan Kim <minchan.kim@xxxxxxxxx>

-- 
Kinds regards,
MinChan Kim
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