Re: kern.ipc.maxsockets limits with 4GB of memory

[Mike Silbersack]

On Wed, 9 Jul 2003, Thomas Chaffic Mowad wrote:

> Someone thought that the kernel might need more memory so we tried
> increasing VM_KMEM_MAXSIZE too 500 megs and then that caused a panic when
> we booted up.
>
> So we're kinda stuck here and any help would be greatly appreciated.
>
> Thanks,
> --Tom Mowad

Have you tried increasing KVA_PAGES?

#
# Change the size of the kernel virtual address space.  Due to
# constraints in loader(8) on i386, this must be a multiple of 4.
# 256 = 1 GB of kernel address space.  Increasing this also causes
# a reduction of the address space in user processes.  512 splits
# the 4GB cpu address space in half (2GB user, 2GB kernel).
#
options KVA_PAGES=260

If that doesn't help, you may also consider trying 4.8-RELEASE or -STABLE;
I believe that some additional changes to fix handling of 4GB machines
were committed after 4.7-RELEASE.  (You'll have to search the mailinglist
archives to confirm this, I can't remember exactly when they occured.)

Also, how are you exhausting 128K sockets to do a test of 2000
simultaneous connections?  Are the rest all in the TIME_WAIT state?

Mike "Silby" Silbersack
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kern.ipc.maxsockets limits with 4GB of memory

[Thomas Chaffic Mowad]

On a Tyan s2466 motherboard with 4 gigs of ram and freebsd 4.7-release-p10
we're having trouble increasing maxsockets beyond 128k.  The kernel panics
when we try buildworlds with any more than 128k.  We were able to increase
maxsockets to 192k with a system that had 2gb and 256k with a system that
had 1.5gb.  Does anyone know what to do in order to get a higher number
for maxsockets?

We need that many sockets because we're trying to run SPECweb99 with over
2000 connections and the server starts dropping connections because theres
not enough sockets.  vmstat -z shows that the sockets are maxed out.

Someone thought that the kernel might need more memory so we tried
increasing VM_KMEM_MAXSIZE too 500 megs and then that caused a panic when
we booted up.

So we're kinda stuck here and any help would be greatly appreciated.

Thanks,
--Tom Mowad






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