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[Chrysalis]

Have a box hosting some stuff, has 192gig of ram.

The OS see's all the ram.  However it will only use half of the ram, the 2nd half just sit unallocated, cache, userspace apps etc. wont use it.  When half of the ram is in use swap takes over.

Anyone know of some kind of 96gig linux bottleneck? or a scenario that would cause linux to recognise ram but not use it?

[roseway]

It might be a function of the swappiness setting. Have a look at this: http://askubuntu.com/questions/103915/how-do-i-configure-swappiness

[Chrysalis]

I will adjust it, but I do appear to have hit a hard cap.

[loonylion]

if it was 32bit using PAE I could understand it, but native 64bit shouldn't have a problem with that much ram. There's definitely no 32bit code anywhere?

[boost]

How are you trying to use it all?

[Chrysalis]

It isnt capped, I ran some test apps to force higher utilisation.

I have now adjusted swappiness down to 10 from the default as swapping out when 90gig of ram is free is stupid, so will see how it goes from now.