Date: Thu, 13 Mar 2008 10:02:49 -0700 From: Chuck Swiger <cswiger@mac.com> To: Stephen.Clark@seclark.us Cc: FreeBSD Stable List <freebsd-stable@freebsd.org> Subject: Re: Approaching the limit on PV entries Message-ID: <5EA4E7F3-6F25-4B41-A123-082E250E3D19@mac.com> In-Reply-To: <47D91998.9030607@seclark.us> References: <fr69hn$q0o$1@ger.gmane.org> <20080312215624.GR67856@elvis.mu.org> <47D91998.9030607@seclark.us>
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On Mar 13, 2008, at 5:10 AM, Stephen Clark wrote: >> sysctl kern.ipc.shm_use_phys=1 >> > > Could you please explain what that does and why? % sysctl -d kern.ipc.shm_use_phys kern.ipc.shm_use_phys: Enable/Disable locking of shared memory pages in core Basically, this sysctl can force SysV shared memory regions to be unpageable aka "locked down" or "wired down". > Also could someone point me to where all these sysctls are > documented other than in the source code - which lots of time has no > explanation. It would really help the average sys admin/ user if > these were documented. "sysctl -ad" will show a one-line description for most of them. Not all of these are intended for normal usage or tuning, however...some reflect purely debugging interfaces which only do make sense in the context of the associated source code. -- -Chuck
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