Date: Fri, 25 Feb 2011 22:12:27 -0600 From: Adam Vande More <amvandemore@gmail.com> To: Mark Terribile <materribile@yahoo.com> Cc: freebsd-questions@freebsd.org Subject: Re: Kernel swap zone exhausted, what is the max allowed? FBSD 7.2 Message-ID: <AANLkTiniHbg2W%2BXOHd-oAoqNDd03-v5=BKSBkZQSPwjm@mail.gmail.com> In-Reply-To: <41786.47452.qm@web110309.mail.gq1.yahoo.com> References: <20110225212941.BC56910656C4@hub.freebsd.org> <41786.47452.qm@web110309.mail.gq1.yahoo.com>
next in thread | previous in thread | raw e-mail | index | archive | help
On Fri, Feb 25, 2011 at 5:11 PM, Mark Terribile <materribile@yahoo.com>wrote:
> I don't explicitly set kern.maxswzone anywhere and it is at its apparent
> maximum and default of 32M (33554432).
>
> Does anyone know if the maximum can be increased? (What actually is it
> used for?) I do use lots of memory-intensive processes, most of them idle
> much of the time. I see that it's involved with the stuff in the src/sys/vm
> directory. Would someone give me a quick precis or pointer to what I need
> to study to understand what would happen if I tried to boost this to 64M?
>
Well
vbox% sysctl -ad kern.maxswzone
kern.maxswzone: Maximum memory for swap metadata
man 8 loader gives:
kern.maxswzone
Limits the amount of KVM to be used to hold swap meta
information, which directly governs the maximum amount of
swap the system can support. This value is specified in
bytes of KVA space and defaults to 32MBytes on i386 and
amd64. Care should be taken to not reduce this value
such
that the actual amount of configured swap exceeds 1/2 the
kernel-supported swap. The default of 32MB allows the
ker-
nel to support a maximum of ~7GB of swap. Only change
this
parameter if you need to greatly extend the KVM
reservation
for other resources such as the buffer cache or
kern.ipc.nmbclusters. Modifies kernel option
VM_SWZONE_SIZE_MAX.
--
Adam Vande More
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?AANLkTiniHbg2W%2BXOHd-oAoqNDd03-v5=BKSBkZQSPwjm>