The reason we did not use 64 bits O.S. due to we still have some problem run 64 bit ORACLE on X86_64.
I have another question: since server we have is "SMP" how come it can show 32 GB RAM on application like "top" and "free"?
Thanks.
--- 09/3/30 (一)，John R Pierce <pierce@xxxxxxxxxxxx> 寫道：
> 寄件者: John R Pierce <pierce@xxxxxxxxxxxx>> 主旨: Re: How to check server kernel support 32 Gb RAM (X86,> 收件者: centos@xxxxxxxxxx> 日期: 2009 3 30 一 下午 2:24> > > > > > we have CENTOS 4.7 (X86) on DELL server, I already put> 32 GB RAM on it. I can use "top" or "free" to check> memory and it did show 32 GB.> > > > I check REDHAT site and found it say:> > > > The "SMP" kernel supports a maximum of 16GB of main> memory. Systems with more than 16GB of main memory use the> "Hugemem" kernel.> > > > I use "uname -r" to check kernel and it show:> > > > # uname -r> > 2.6.9-78.0.13.ELsmp> > > > It did NOT show "Hugemem", does this server kernel> support 32 GB or not? If NOT how can I change kernel> to "hugeme"?> > Dare we ask why this isn't a 64bit server? > using 32gb of memory on a processor architecture that can> only directly address 4GB at a time is kind of brutal,> unless this server is handling a rather large number> of connection sessions at the same time. For> instance, a 32bit database server will have a max of about > 2.5GB of shared memory usable.> > to install the hugemem kernel, > yum install kernel-hugemem> reboot, and test this by selecting it in the grub menu,> then adjust /boot/grub.conf to suit.> > read the release notes carefully on hugemem, its a very> high overhead thing, as the kernel runs in a private> memory space seperate from the applications, so all> kernel<->user transfers are complex and slow.> http://www.centos.org/docs/4/html/release-notes/as-x86/> > > _______________________________________________> CentOS mailing list> CentOS@xxxxxxxxxx> http://lists.centos.org/mailman/listinfo/centos>
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