Date: Tue, 20 Mar 2001 10:38:35 -0800 (PST) From: Matt Dillon <dillon@earth.backplane.com> To: "Michael C . Wu" <keichii@iteration.net> Cc: izero@ms26.hinet.net, cross@math.psu.edu, Alfred Perlstein <bright@wintelcom.net>, grog@FreeBSD.ORG, fs@FreeBSD.ORG, hackers@FreeBSD.ORG Subject: Re: tuning a VERY heavily (30.0) loaded scerver Message-ID: <200103201838.f2KIcZP95379@earth.backplane.com> References: <20010320111144.A51924@peorth.iteration.net> <20010320092717.R29888@fw.wintelcom.net> <20010320113818.B52586@peorth.iteration.net> <20010320120112.C52586@peorth.iteration.net> <200103201815.f2KIFR594803@earth.backplane.com> <20010320122350.F52586@peorth.iteration.net>
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:| How big is 'lots'? If the shared memory segment is smallish, e.g.
:| less then 64MB, you should be ok. If it is larger then you will
:| have to do some kernel tuning to avoid running out of pmap entries.
:
:This is exactly what happens to us sometimes. We run out of pmap entries. :)
:But what can we tune?
:--
:+-----------------------------------------------------------+
:| keichii@iteration.net | keichii@freebsd.org |
What Alfred said:
sysctl -w kern.ipc.shm_use_phys=1
(run prior to creating the initial shared memory segment, e.g. when
the machine is booted).
That should solve the pv entry problem. What Alfred said in regards
to 'sysctl -a' crashing too... We'll fix it if you give us a
traceback!
The kernel config you are using would be useful. It sounds like there
are a bunch of things you either need to tune or have already tuned in
the kernel configuration.
-Matt
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