Re: Swappiness vs. mmap() and interactive response
From: KOSAKI Motohiro
Date: Wed Apr 29 2009 - 03:50:38 EST
>> Mapped page decrease rapidly: not happend (I guess, these page stay in
>> active list on my system)
>> page fault large latency: happend (latencytop display >200ms)
>
> hm. The last two observations appear to be inconsistent.
it mean existing process don't slow down. but new process creation is very slow.
> Elladan, have you checked to see whether the Mapped: number in
> /proc/meminfo is decreasing?
>
>>
>> Then, I don't doubt vm replacement logic now.
>> but I need more investigate.
>> I plan to try following thing today and tommorow.
>>
>> - XFS
>> - LVM
>> - another io scheduler (thanks Ted, good view point)
>> - Rik's new patch
>
> It's not clear that we know what's happening yet, is it? It's such a
> gross problem that you'd think that even our testing would have found
> it by now :(
Yes, unclear. but various testing can drill down the reason, I think.
> Elladan, do you know if earlier kernels (2.6.26 or thereabouts) had
> this severe a problem?
>
> (notes that we _still_ haven't unbusted prev_priority)
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