Problems with AMD64 and 8 GB RAM?

Ganbold ganbold at
Wed Mar 30 23:15:07 PST 2005


Since we are discussing AMD64 with 8GB RAM, I also would like to point my 

I'm still looking for possibility to run FreeBSD 5.3-STABLE with more than 
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.

Please see my previous posts:


thanks in advance,


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