Differece between printf and printk 4955

Aragorn

Yes, but offers 64 GBytes to whom? Not individual applications, since they can address but about 4 GBytes. Not directly to the kernel, either, since it can access only about 4 GBytes.

I was not referring to a 3GB - 1GB split, but a 4GB - 4GB split. You can get this by adjusting how you compile the kernel. In .config (excess entries retained so you can find it):

# # CPU Frequency scaling # # CONFIGCPUFREQ is not set CONFIGTOSHIBA=m CONFIGI8K=m CONFIGMICROCODE=m CONFIGX86MSR=m CONFIGX86CPUID=m # CONFIGE820PROC is not set CONFIGEDD=m # CONFIGNOHIGHMEM is not set # CONFIGHIGHMEM4G is not set CONFIGHIGHMEM64G=y CONFIGHIGHMEM=y CONFIGHIGHPTE=y CONFIGX86PAE=y CONFIGHIGHIO=y # CONFIG2GB is not set # CONFIG1GB is not set

This is in my .config file, and appropriate since I have 4 GBytes RAM. But if I were to stick in another 4GBytes (no sense increasing it by a lesser amount), I would have to change the two lines marked by an arrow and recompile. Actually, I would just get a different kernel from Red Hat that is already built for this.

Not necessarily. If I did it now without recompiling the kernel (actually, my MB will accept only 16 GBytes), it would run as you say (and I would not actually bother), but if I wanted a little more space for some huge application (IBM's DB2 dbms comes to mind) and wanted the system to have more IO buffer and cache space, I guess I would use the 4 - 4 split kernel.

-- .~. Jean-David Beyer Registered Linux User 85642. V PGP-Key: 9A2FC99A Registered Machine 241939. ^^-^^ 10:30:01 up 6 days, 3:32, 3 users, load average: 4.31, 4.20, 4.17