from http://uptime.netcraft.com/up/accuracy.html#whichos
Operating systems we can usually work out uptimes for are:
...
* Linux on Intel x86 processor, kernel versions 2.1 to 2.5.24
...
Kernels 2.2.x and 2.4.x are not affected.
Release date of 2.2.x branch - January 1999
Bottom position in Top 50 with max of 1372 days ie. around 3 years and 9 months.
So why there is not at least one Linux box in top 50 ?
f.E.
Kernels 2.2.x used for both "stable" Debian releaes Potato and Woody
http://www.debian.org/releases/potato/
http://www.debian.org/releases/potato/i386/release-notes/ch-whats-new.en.html
http://www.nl.debian.org/releases/woody/i386/release-notes/ch-whats-new.en.html
Ach jo...
http://uptime.netcraft.com/up/accuracy.html#whichos
"Additionally HP-UX, Linux, NetApp NetCache, Solaris and recent releases of FreeBSD cycle back to zero after 497 days, exactly as if the machine had been rebooted at that precise point. Thus it is not possible to see a HP-UX, Linux or Solaris system with an uptime measurement above 497 days."