We also have this problem with a RH4 system (EM64T and the smp kernel) using 4GB memory (P4 650). The BIOS sees 4GB memory, but RH only sees 3.3GB memory. Apparently, this is an Intel chipset issue and cannot be fixed using software (apparently). Intel are aware of it, but have not put any fix out yet. I don't know about AMD processors (the systems we have using AMD processors only have 2GB), but our Intel system with 4GB has lost 700MB of memory. Intel do assure us that the OS can see the whole 4GB of memory, but I don't think I believe them too much... Andy -----Original Message----- From: nilesh vaghela [mailto:nileshj.vaghela@xxxxxxxxx] Sent: 01 December 2005 05:39 To: General Red Hat Linux discussion list Subject: Re: physical memory If you can upgrade to AS 4.0 would be the best. Other wise you can use hugemem kernel. as suggested by Tobias Speckbacher Nilesh On 12/1/05, Tobias Speckbacher <TSpeckbacher@xxxxxxxxx> wrote: > > > -----Original Message----- > > From: redhat-list-bounces@xxxxxxxxxx [mailto:redhat-list- > > bounces@xxxxxxxxxx] On Behalf Of Mindy Preston > > Sent: Wednesday, November 30, 2005 10:02 AM > > To: General Red Hat Linux discussion list > > Subject: Re: physical memory > > > > Brian, > > > > Are you running a 64-bit version of Red Hat? If you're running a > 32-bit > > one you will be limited to 4GB of memory, since more can't be > addressed > > by 2^32. > > The hugemem kernel supports up to 64GB of memory for 32 bit AS3 systems. > There is some performance impact to using memory sizes over 4GB on 32bit > systems, from what I read 2-3%. > > The limiting factor is the maximum memory allocation per user process, > which can not be larger than 4GB, the same goes for kernel address > space. > > For reference please check: > > http://www.in.redhat.com/software/rhel/3features/ > > > > > -Mindy > > > > -- > > redhat-list mailing list > > unsubscribe mailto:redhat-list-request@xxxxxxxxxx?subject=unsubscribe > > https://www.redhat.com/mailman/listinfo/redhat-list > > -- > redhat-list mailing list > unsubscribe mailto:redhat-list-request@xxxxxxxxxx?subject=unsubscribe > https://www.redhat.com/mailman/listinfo/redhat-list > ********************************************************************** AMEC Nuclear Holdings Limited (no. 3725076), AMEC NNC Limited (no. 1120437), National Nuclear Corporation Limited (no. 2290928), STATS-NNC Limited (no. 4339062) and Technica-NNC Limited (no. 235856). The registered office of each company is at Booths Park, Chelford Road, Knutsford, Cheshire WA16 8QZ except for Technica-NNC Limited whose registered office is at Citygate, Altens Farm Road, Aberdeen, Aberdeenshire, AB12 3LB. AMEC NNC's head office and principal address is Booths Park and the switchboard number is 01565 633800. The AMEC NNC website is www.amecnnc.com Any request, advice, information or opinion in this message which does not relate to the business of any of the above companies is not authorised by any of the above companies. Where this message does so relate, it is sent by the relevant company (as above) and is confidential and intended for the use of the individual or entity to whom it is addressed. The content is subject to contract and, unless so stated, does not form part of any contract. If you have received this e-mail in error please notify the AMEC NNC system manager by email at eadm@xxxxxxxxxxxx ********************************************************************** -- redhat-list mailing list unsubscribe mailto:redhat-list-request@xxxxxxxxxx?subject=unsubscribe https://www.redhat.com/mailman/listinfo/redhat-list
