> You probably understand this better than I do, but I have never been able to > find enough performance difference in PAE vs. default kernels to worry me, at PAE costs you a few percent on tlb loads. The big hit with > 1GB RAM is the cost of the remapping of user pages and the TLB flushes it causes, and on the 'hugemem' > 4GB referencing kernel that grows a lot more as well as getting a lot of problems with 32bit capable I/O devices and Intel processors with non IOMMU. It depends a lot on workload and CPU variant. > I'm writing this in a VM running FC9 under a native "2.6.22.14-72.fc6PAE" kernel > which is heavily used in native mode using all 4GB memory. I did measure this > against both the non-PAE 32 bit kernel and x86_64 kernel for desktop, gimp, and > kernel builds. If you are using a VM you've already totally shot your page table performance to bits so it won't make any difference. Alan -- fedora-list mailing list fedora-list@xxxxxxxxxx To unsubscribe: https://www.redhat.com/mailman/listinfo/fedora-list Guidelines: http://fedoraproject.org/wiki/Communicate/MailingListGuidelines
