[1.1.0-0ubuntu1~bzr341] Nearly hangs even modern computer while indexing large file

And your kernel version is? This sounds like a duplicate of Bug #376896. And if not there's already an option in Advanced->experts only -> Max hash speed for limiting the hashing speed.

--RZ

It's a different case. My kernel is 2.6.31 (Karmic), and I have vm.swappiness = 0.

I'll try to play with this expert option, thank you. But maybe it shouldn't be an "expert-only" option? After all it's hard to break a program via it.

OK, I have no idea if that kernel behaves any differently.

I think that option was (at least in early versions) there in vanilla dc++ also (that's pretty much the reason why it's there in linuxdcpp). Also true that you really can't break anything with that, but most users want their shares hashed as fast as possible, so that makes it a bit of an expert option.

But hashing should not cause your Core2Duo to slow to a crawl unless 1) there's the swapping problem (check with free or top if swapping occurs while hashing), 2) You have a problem with DMA (it isn't enabled) 3) you have a blazing fast disks (which I doubt since you were running on a notebook). Those are the most common culprits that I could think of, but of course there's always a possibility that there's some bug hiding somewhere and in that case we'd need to figure out how to reproduce it (or a patch fixing it is always welcome ;)

--RZ

I'll try to investigate the case.