zfs very poor performance compared to ufs due to lack of cache?
killing at multiplay.co.uk
Sun Sep 5 13:29:43 UTC 2010
> ----- Original Message -----
> From: "jhell" <jhell at DataIX.net>
>> Attached is the needfree patch mentioned in the URL alongside a local
>> system patch to adjust kern.maxusers to no more than 512 on systems that
>> can support it...
No joy, still drops down to arc_min even with those two patches and changing
to vm_paging_needed from the post Artem mentioned:
So I suspect if I hadn't put in a high arc_min as well it would be back down
at silly low levels.
Mem: 26M Active, 1360M Inact, 2434M Wired, 6188K Cache, 418M Buf, 117M Free
Swap: 4096M Total, 15M Used, 4081M Free
Current Size: 57.14% 2048.00M (arcsize)
Target Size: (Adaptive) 57.14% 2048.00M (c)
Min Size (Hard Limit): 57.14% 2048.00M (c_min)
Max Size (High Water): ~1:1 3584.00M (c_max)
So there's still 1.3G of mem sitting inact, don't know what caused that but
its essentially dead memory now it seems.
I know I could raise arc_min even further but that could be dangerous?
Any other suggestions? It seems like arc needs to cooperate with the
rest of the OS pagedaemon more?
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