Problems with AMD64 and 8 GB RAM?

Scott Long scottl at
Wed Mar 30 23:25:46 PST 2005

Ganbold wrote:
> Hi,
> Since we are discussing AMD64 with 8GB RAM, I also would like to point my
> problem.
> I'm still looking for possibility to run FreeBSD 5.3-STABLE with more
> than 4GB RAM 
> on Dual amd64 2.2GHz machine (IBM @server 325) with ServeRAID 6M (ips
> driver)).
> Right now I'm using only 4GB RAM and this server is in production.
> #uname -an
> FreeBSD 5.3-STABLE FreeBSD 5.3-STABLE #12: Mon Nov 22
> 12:04:57 ULAT 2004    
> tsgan at  amd64
> As Scott said a few months ago, problem is below:
> "The ips driver looks like it will fail under heavy load when more
> than 4GB 
> of RAM is present.  It tries to force busdma to not defer requests
> when the 
> bounce page reserve is low, but that looks to be broken and
> will result in corrupted commands."
> Are the ips driver and bus_dma problems fixed yet in STABLE tree? 
> Is it worth to try source update and see how it works? I'm afraid to do
> so, since it is production server.

Yes, I (hopefully) fixed the problems that I pointed out, and I also
locked it and added crashdump support.  It is reported to be stable and
fast now, so you won't go wrong by updating.  These changes are in both
5-stable and 6-current.


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