Date: 28 Apr 1999 10:37:37 +0200 From: Dag-Erling Smorgrav <des@flood.ping.uio.no> To: Didier Derny <didier@omnix.net> Cc: hackers@FreeBSD.ORG Subject: Re: large shared memory (increasing kvm) Message-ID: <xzpn1zt5eem.fsf@flood.ping.uio.no> In-Reply-To: Didier Derny's message of "Fri, 23 Apr 1999 16:37:19 %2B0200 (CEST)" References: <Pine.BSF.3.96.990423163019.3173A-100000@idefix>
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Didier Derny <didier@omnix.net> writes:
> for the SQL server, I need a large shared memory (SHMMAXPGS=9216)
> I have maxusers = 512
You shouldn't. Such as it is, your kernel can't properly cope with
values of maxusers greater than 64. You need a larger kvm to handle
that.
> the memory is actually of 256Mb and will be increased to 1Gb
>
> the kernel is still a.out
>
> [I have no possibility to stop the machine to upgrade to 3.1-RELEASE or
> 3.1-STABLE (upgrade planned in july/august)]
There is a FAQ entry (13.15) on modifying the size of the kernel
virtual address space. However:
a) doing so will break binary compatibility with BSD/OS unless you
also apply John Polstra's patches or upgrade to 3.1.
b) you will need to upgrade your boot blocks and loader to cope with
the kvm size change; you have to change the load address as well
as the kvm size, and the 3.0-RELEASE.
> (I'm running FreeBSD 3.0-RELEASE on a dual pentium II machine
> [ASUS P2B mother board] everything works just fine except that
> we need to largely increase the shared memories and the semaphores])
Running 3.0-RELEASE on a mission-critical database server? Bad dog,
bad! No bone for you today!
> is VM_KMEM_SIZE working with FreeBSD-3.0-RELEASE ?
I *think* so, but I've never frobbed it, so I can't really comment.
> what value would you suggest ?
1 GB, which is the default in 3.1 and 4.0 now. Just follow the
instructions in the FAQ.
DES
--
Dag-Erling Smorgrav - des@flood.ping.uio.no
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