sysctl maxfiles

Peter Jeremy peterjeremy at
Sun Sep 28 08:23:36 UTC 2008

On 2008-Sep-28 08:29:20 +1000, Aristedes Maniatis <ari at> wrote:
>I guess then I should ask the question a different way. How much  
>memory does each fd use and which pool of memory does it come from?  

72 bytes for i386, 120 bytes for amd64.  It's a UMA zone 'Files'.
You can check with 'vmstat -z|grep Files'

Peter Jeremy
Please excuse any delays as the result of my ISP's inability to implement
an MTA that is either RFC2821-compliant or matches their claimed behaviour.
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