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Re: git: kernel - vm - Change inactive target to 1/4 memory instead of 1/2 memory.

From: Johannes Hofmann <johannes.hofmann@xxxxxx>
Date: 28 Mar 2010 19:09:07 GMT

Johannes Hofmann <johannes.hofmann@gmx.de> wrote:
> Matthew Dillon <dillon@apollo.backplane.com> wrote:
>> :On my troublesome 2GB machine, the inactive memory is now ~= 750M, which
>> :is about 1/3 of RAM, quite far from the 1/4 target.
>> :
>> :-- 
>> :Francois Tigeot
>>    It's just a target for the pageout daemon, it isn't something the
>>    machine tries to hold itself to.
>>    Guys... everyone.  Please don't try to interpret the values for
>>    the active & inactive queues.  Even a good chunk of the analysis of
>>    the swap space use is wrong.  There's absolutely nothing wrong with
>>    the machine paging stuff out to swap.  The issue is only whether it
>>    does so to the degree that later pageins effect performance.
>>    Avalon, for example, usually has 200-400MB of idle data swapped out
>>    which it basically never touches.  It doesn't effect avalon's
>>    performance.
> One point is probabely whether swap is on a disk with otherwise high
> IO rate. On my single disk system it is clearly a performance problem 
> if program data is paged out due to filesystem activity because then
> the paging in is very slow.
> I can trigger this situation with
>        hammer cleanup
> but also with
>        find / -type f | xargs md5

This got fixed with 69adbed48cd5565446e8013fcc5131405a9e7c05


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