There's two places in mldonkey where you can choose which level of messages you want to see in your log file. * The first is while configuring mldonkey before building it. You can choose a level with --enable-verbosity={level} where {level} is in 'nolog', 'extra', 'debug', 'info', 'warn', 'error' and 'fatal'. 'yes' and 'no' being aliases respectively for 'debug' and 'nolog'. The meaning of these levels are : # 'debug' and 'extra' : messages to developpers. # 'info' : messages of positive feedback of what is doing mldonkey. # 'warn' : messages to warn you that something is different from what you might have expected. # 'error': messages to alert you that something is wrong in mldonkey. # 'fatal': messages to announce the end of the world as you know it. # 'nolog': no messages The default level you want to choose is probably 'info'. * The second place where you can choose which level is when mldonkey is running. You can use set verbosity_level {level} (or change it in downloads.ini) The possible levels are 'nolog', 'debug', 'info', 'warn', 'error' and 'fatal' with the same meanings as above. In both cases the levels are ordered per importance : 'debug' < 'info' < 'warn' < 'error' < 'fatal'. If you choose a level then all messages from a superior or equal level will be logged. FAQ : 1) Why two choices ? The choice before building mldonkey is to enable you to strip some code from mldonkey, and use the saved ressources to Search for Extraterrestrial Intelligence while you're at home. 2) What if i choose 'warn' before building mldonkey and 'info' while mldonkey is running? You will get messages from level 'warn' and superior since the code to log messages of level < 'warn' is not in your mldonkey program. If you don't mind searching for E.Ts, and want to help Searching for Bugs in Mldonkey at Home you should use to build you mldonkey with "--enable-verbosity=debug", and when you are in the mood to look for bugs switch you runtime level to debug "set verbosity_level debug". To sum up : the minimum level of messages you will be able to log is --enable-verbosity=level.