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Date: Tue, 08 Jun 2010 10:25:56 +0300
From: Andriy Gapon <avg@icyb.net.ua>
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To: Artem Belevich <fbsdlist@src.cx>
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Cc: freebsd-fs@freebsd.org
Subject: Re: ZFS memory usage
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on 08/06/2010 03:14 Artem Belevich said the following:
> I believe it's pagedaemon's job to push pages from active list to
> inactive and from inactive down to cache and free.
> I have a really ugly hack to arc.c which forces pagedaemon wakeup if
> ARC sees too much memory on inactive list.
> How much is too much is defined by a sysctl value.
> 
> http://pastebin.com/ZCkzkWcs
> 
> Be warned: it's ugly, it may not work, it assumes too much, it's plain
> broken, it may <write in your worst nightmare details here>...
> I'm serious -- I have seen my box locking up when I did manage to
> exhaust memory. The only reason I'm posting this ugliness at all is
> bacause of hope that someone more familiar with memory allocation in
> FreeBSD may be able to suggest better approach.


I think it's a good start.
I did a much more primitive thing locally and even that improved thing for me a
lot - I simply dropped "(vm_paging_target() > -2048" check.

Kip Macy is aware of this situation, perhaps he'll look into resolving it.

-- 
Andriy Gapon