DragonFly users List (threaded) for 2008-06
Re: HAMMER lockup
:I've backed up my /home partition and formatted it as HAMMER. I
:restored it and then moved some files around, did a prune-everything
:and a reblock, all worked fine. (I love to see how hammer does NOT
:stress the harddrive, as the LED rarely blinks. ;-)
:However, 256M of RAM is not enough for HAMMER, but that's not a big
:issue compared to ZFS.)
Yah, I like HAMMER's buffering too. UFS's softupdates has to flush
under certain conditions and UFS also uses cluster_write() which
tends to want to flush data out as buffers fill up. HAMMER doesn't
have to flush under any circumstances until the number of dirty buffers
exceeds 1/2 the available buffer space.
I've never run rtorrent, what you are rtorrent'ing to cause the lockup?
I am half suspecting that the lockup may be due to large write()'s
occuring in parallel and deadlocking the buffer cache. Nearly all of
the other lockups I located during testing have been related to buffer
cache deadlocks. I should be able to get it fixed this evening if I
can get it more reliably reproduced on my test box.