[ubuntu] No thrills network speed

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http://ubuntuforums.org – 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 (Hardware)