From owner-freebsd-hackers  Wed Jun 26  1:29:37 2002
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Date: Wed, 26 Jun 2002 00:19:06 -0700
From: Terry Lambert <tlambert2@mindspring.com>
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To: Patrick Thomas <root@utility.clubscholarship.com>
Cc: Peter Wemm <peter@wemm.org>, Alfred Perlstein <bright@mu.org>,
	freebsd-hackers@FreeBSD.ORG
Subject: Re: tunings for many httpds...
References: <20020625225929.U68572-100000@utility.clubscholarship.com>
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Patrick Thomas wrote:
> > > Uhh, Terry, neither form of SHM uses KVA.  Either pageable or physically
> > > backed.  The memory is only mapped into processes and is NOT mapped into
> > > KVA anywhere. (*)
> >
> > You and Alfred are right.
> >
> > It looks like this was corrected by John Dyson, shortly after he
> > had checked it in to work that way.
> 
> So the conclusion is that:
> 
> sysctl kern.ipc.shm_use_phys=1
> 
> Is not even potentially a magic bullet for the issue I am seeing (since
> either way, all those greatly increased SHM/SEM settings I added are not
> using KVA) ??

It will save some KVA, especially after forks, as Peter pointed
out.  But it's unlikely at this point, given the off-list issues,
that your problem is KVA space, particularly since it's happening
at the same time very day.

-- Terry

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