No thrills network speed
I've tried every aspect of tuning and Ubuntu 9.04 x64 gave nothing so far.
Tried sysctl stuff to tweak, no good with stuff that other people found OK even, apt-get hung and so on.
Acer Aspire 5630 with 4 GB RAM, installed Intel Core 2 Duo 5600 1,83 Ghz, new Intel 4965 N, 7200 rpm 320G disk, new DVD burner, so the thingy is revamped too.
Acer laptop with 4965 N card, 2.1 MB/s and gave 130 Mbit connection
D-Link DGE-660TD Gigabit pccard, 5,7 MB/s
Windows XP x64 SP2 (and Windows 7 x64 by the way is slower than XP x64):
4965 - 18.5 MB/s and 300 Mbit connection
D-Link DGE-660TD Gigabit pccard, 32.2 MB/s
No Linux distro came near those of XP: Sabayon 5.0, Fedora 11 KDE, slax, AntiX, MEPIS 8.0, openSuSE 11 and 10 more distroes
Opensolaris managed to follow XP ! in speed, but lacking too many programs, tried compiling some software but after compiling 23 depends I got broken KDE.
So again for the X time, back to XP, giving Linux up for good this time sorry. It's too early yet, because I have an AMD64 5000+ on a Gigabyte GA-MV69-S2 with 6 GB ram for MySQL database server.
Tried Arch Linux x64 with every HOWTO page I could find, install a LAMP but I found the network bug there too with Realtek 8169 gigabit chip
So I have 5 ! pc's , two laptops and 3 servers ... every network card is Realtek chip. All Windows versions = no problems