<div dir="ltr"><br clear="all"><div>In a system with 3:1 split, the ZONE_NORMAL with a size of 896MB is permanently mapped to the kernel address space.This leaves a 128MB free space in the Kernel address space and according to my understanding, the ZONE_HIGHMEM pages are mapped temporarily to this 128MB part. If the system actually had a 4GB physical memory you will be mapping(not smultaneously) the HIHGMEM part- which is roughly 3.2GB - to this 128MB part. If that was the case Kernel would have to frequently access HIHGMEM which implicates a frequent change in temporaty mapping and that in my view is a penalty. So what was the reason why ZONE_NORMAL fixed at 896MB and not something really lower?<br>
</div><div><br></div>-- <br><div><font face="'arial narrow', sans-serif" color="#C0C0C0"><b>Regards,</b></font></div><div><font face="'arial narrow', sans-serif" color="#C0C0C0"><b>Paul Davies C</b></font></div>
<a href="http://vivafoss.blogspot.com" target="_blank">vivafoss.blogspot.com</a>
</div>