Eclipse does not give you the possibility to change the font size of the views like 'Project Explorer' or 'Servers', which looks ugly on Linux since Eclipse uses the default (desktop) font size. But you can edit specific configuration files to get the proper font sizes.
To fix this annoying font size, go to
/[YOUR_INST_DIR]/eclipse/plugins/org.eclipse.ui.themes_[LATEST_INSTALLATION]/css
and add this content...
.MPart Tree{
font-family: Sans;
font-size: 8px;
}
to the bottom of the following files:
e4_classic_winxp.css
e4_classic_win7.css
BEFORE CHANGE
AFTER CHANGE