On Tue, 2011-05-24 at 11:27 -0400, Bill Davidsen wrote: > Rahul Sundaram wrote: > > On 05/24/2011 08:19 PM, Nat Gross wrote: > >> Planning to install Fedora 15 on a new partition dual boot win 7. > >> Hardware AMD 1090 (6 core) with 8 gig ram. > >> Doing Java programming and plan to use KVM machines with Fedora as the host os. > >> Of course regular stuff on the web including videos, etc. > >> > >> So, the question is. Is it still advisable to go 32 bit due to > >> stability (say Flash), or can I gain performance and have 99% > >> stability with 64 bit F 15? > > > > Virtualization certainly benefits a lot from x86_64 to the point that > > RHEL6 only supports it on that architecture. I would recommend going > > with x86_64 for your use cases > > > What? Are you saying that KVM support is out of the PAE 32bit kernel? Because > libvirt, virt-manager, etc, are definitely shown as available packages. As far > as limitations and performance go, unless you have applications which push the > 4GB memory limit of PAE, you will be essentially the same in either case, but > will have a harder time finding third party applications for 64 bit. What prevents you from installing 32bit 3'rd party applications (such as flash) on x86_64? Multi-lib is no longer an issue - at least not since Fedora 5-6. > I have a pair of systems, i7-950, 12GB RAM, 4x1TB RAID5, doing VM hosting. One > is fc13 i686, one is fc13 x86_64. There is no obvious performance difference, > the only benefit of x86_54 is that I can run a 64 bit guest for testing. PAE does have it's own performance penalties. (At least in my experience, certain use-case show >10% performance hit) As a VM server, running x86_64 guest and/or guests with >4GB RAM is an issue. ... Plus, certain application (even ones that don't require >3GB RAM) can use the extra GP registers and show a 10-100% performance difference. YMMV. > So: don't expect a big performance gain from 64 bit, unless you run some huge > app you would not be likely to see it. Don't expect stability problems, I'm not > sure that has ever lived up to the hype, the base OS seems fine, and has since > fc6, when I first tried 64 bit. DO expect more effort in finding 3rd party apps, > and occasionally some stability problems in that area (the latest 64 bit version > of vlc locks up in 64 bit, for example). VLC is rock solid on my machines. ... In general, my advice is rather the opposite: Unless you're severely limited by memory (<2GB), disk-space (mutli-lib) or bandwidth (multi-lib again), x86_64 is your best bet. > Don't expect to see a big difference whichever way you go, it depends on your > desire for 3rd party apps to some extent. I fully agree. Again, at least in the certain applications that I use, the added GP registers do wonders in x86_64. - Gilboa -- users mailing list users@xxxxxxxxxxxxxxxxxxxxxxx To unsubscribe or change subscription options: https://admin.fedoraproject.org/mailman/listinfo/users Guidelines: http://fedoraproject.org/wiki/Mailing_list_guidelines
