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How expensive is highmem

How expensive is highmem

Posted Oct 23, 2009 11:52 UTC (Fri) by mjg59 (subscriber, #23239)
In reply to: How expensive is highmem by Cato
Parent article: Fixing kmap_atomic()

It's supported in the sense that anything that doesn't work is a bug, but not supported in the sense that it's basically untested. There are certainly missing ioctl translations and suchlike, and random applications may fail as a result.

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How expensive is highmem

Posted Oct 23, 2009 22:02 UTC (Fri) by paulj (subscriber, #341) [Link]

Now we just need distros to support 64bit/primarily-32bit kernel/userspace.

(Fedora is tantalisingly close, but yum updates don't quite work right)

How expensive is highmem

Posted Oct 24, 2009 10:54 UTC (Sat) by nix (subscriber, #2304) [Link]

In practice it works well enough for normal userspace apps. It might not
work for things that do Linux-specific stuff like iptables, but if you're
running a 64-bit userspace with some 32-bit apps that you can't get 64-bit
equivalents for (like World of Goo ;) ) then it should just work.

The POSIX subset of what Linux can do absolutely does work in 32-bit
compat mode.

How expensive is highmem

Posted Oct 24, 2009 20:23 UTC (Sat) by dlang (subscriber, #313) [Link]

actually, no.

one thing I ran into is trying to get the citrix client working (yes, a binary-only app), it needs various other libraries, including X libraries. these are not part of the stuff supported by the 32 bit compatibility libraries.

I don't run many 32 bit apps, but I've run across a half dozen of them that have required that I manually download and install some 32 bit versions of packages on my 64 bit machine before they work.

however, I have been able to get every one of them to work.

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