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Date: Thu, 22 Nov 2007 22:51:23 +0100
From: Kris Kennaway <kris@FreeBSD.org>
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To: Ivan Voras <ivoras@freebsd.org>
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Cc: freebsd-stable@freebsd.org
Subject: Re: 2 x quad-core system is slower that 2 x dual core on FreeBSD
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Ivan Voras wrote:
> On 22/11/2007, Kris Kennaway <kris@freebsd.org> wrote:
>> Ivan Voras wrote:
>>> Kris Kennaway wrote:
> 
>>>> OK, let's take a step back here.  Did you obtain the lock profiling
>>>> trace and verify that you're seeing the same problem as Alexey?  Can I
>>>> see the trace?
>>> Here it is:
>>>
>>> http://ivoras.sharanet.org/stuff/lock_profile.txt
>>>
>>> This is without your patch.
>>>
> 
>>> Your reading of the lock profile will be appreciated.
>> OK, how about with?
> 
> The machine is going into production and I can't do such interventions
> on it any more. Based on the lock trace, do you think It's the same
> problem as Alexeys?

It looks like lockmgr, and the patch should definitely have helped. 
Maybe you forgot to enable vfs.lookup_shared?

Kris