Re: Problems with AMD64 and 8 GB RAM?

From: Alan Jay (alan_at_cyclopsvision.co.uk)
Date: 03/31/05

  • Next message: Uwe Doering: "Re: Adaptec 3210S, 4.9-STABLE, corruption when disk fails" 
    To: <freebsd-stable@freebsd.org>
Date: Thu, 31 Mar 2005 21:08:27 +0100

    > Date: Thu, 31 Mar 2005 16:12:35 +0900
    > From: Ganbold <ganbold@micom.mng.net>
    > Subject: Re: Problems with AMD64 and 8 GB RAM?
    >
    > 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 publica.ub.mng.net 5.3-STABLE FreeBSD 5.3-STABLE #12: Mon Nov 22
    > 12:04:57 ULAT 2004 tsgan@publicc.ub.mng.net:/usr/obj/usr/src/sys/AMD
    > 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."

    [Alan Jay] Since we are talking about FreeBSD on AMD64 on the AMD64 list I
    have reported issues on that list.

    I have a TyanThunder K8S pro S2882 twin Operteron with 8Gb of RAM and although
    I can get the machine to run reasonably stably with 8Gb of RAM with limited
    loading when pushed it falls over unpredictably.

    We did some tests with the latest 5.3-STABLE / 5.4-PRERELEASE and still found
    the same issues when using a mySQL database heavily hit over the Ethernet
    controller. Our final tests limited the memory on boot-up to 4Gb and the bug
    is still there so we think it may well be some interaction with the Ethernet
    controller. The motherboard we have has a BroadcomBCM5704C 10/100/1000 based
    card on board.

    Again this works fine initially but then we get a very dramatic failure with
    no warning messages and the system falls over.

    There are still a few issues to be ironed out with the FreeBSD 5.x on AMD64
    the latest STABLE/PRE-RELEASE is much improved but be aware there may be
    issues. We will be waiting a few more weeks before re-trying these tests to
    see if the latest fixes that have been discussed have solved our problems.

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