Subject: Re: PR kern/20191, plea for fix in 1.6.2!
To: Nicolai Stevens <>
From: Greg Oster <>
List: tech-kern
Date: 11/16/2003 13:01:00
Nicolai Stevens writes:
> > Assuming you need the RAID more than you need
> > softdeps, a workaround is to just turn off softdeps.
> I would if I knew for certain it would work.  The
> audit-trail of the PR suggests that it also crashes
> with softdeps disabled.
> Is there anything else tunable (sysctl's, etc..) that
> might make this problem less frequent?

Others have had luck with turning off softdeps and patching
sys/uvm/uvm_page.c so that it has:

 uvmexp.reserve_kernel = 128;

instead of:

 uvmexp.reserve_kernel = 5;

Each case is going to be slightly different, based on RAID params, 
etc., but if you're seeing lots of panics, it's probably worth the 
effort to try it.


Greg Oster