39

40

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43 here

42 missing

true

lol didn't realise this is where I had typed that

do you guys use zfs for regular systems, not necessarily for storage

like, instead of UFS

and if so, how much ARC do you allow

rwp, interesting, I've never heard of those symptoms yet. I use TMEM which is now removed from the linux kernel. It allowed to have dynamic RAM for the XEN guests.

It also causes loads of problems.

last1: yes, exclusively ZFS for all systems, i do not use ARC.

But at least it's a way to save memory and the guest knowing how much it really has.

so it's safe to disable ARC ?

I was reading mixed information on that

elge, I think you refer to my comment about overbooked RAM for VMs? Yes. There was this project that had a server that they were running 26 active VMs upon and overbooked the RAM and it was really a problem.

last1: yes, my rule of thumb for laptops and workstations has been to cap ARC at 1/8th total RAM

Talking about ARC adaptive read cache makes me want to advertise more about using O_SYNC|O_DIRECT flags more to tell the kernel not to store that I/O in the cache as it is a one time thing and caching is not useful for it.

The main way I do this is reading and writing ISO files which tend to be DVD sized large files and so I will use dd iflag=fullblock oflag=sync,direct in order to do this. Avoids blowing out the cache with one time data.

moi kaikki

how universal is mmap supporting MAP_ANON

Very.

Someone might like to change the topic, bsd.to stopped working some time ago.

grahamperrin

Yes. It's been quite some months now that bsd.to has not been functional. Sad state of things.

seems to be a repeating pattern