On Wed, 14 Dec 2011 00:57:52 +0700
Dmitriy Kryuk wrote:
I'm running Transmission (http://www.transmissionbt.com/), а
BitTorrent client on my FreeBSD 7.2 box. It requests large recieve
buffers for its network connections. This leaves my system with
absolutely no free memory. If some process frees a large amount of
memory, it gets consumed about 1.5 megabytes per second until it
drops to zero. I don't seem to have any problems like denied network
connections or memory allocation, but it makes my system swap in and
out often. As top shows:
CPU: 24.9% user, 0.0% nice, 27.2% system, 33.1% interrupt, 14.8% idle
Mem: 217M Active, 143M Inact, 105M Wired, 25M Cache, 59M Buf, 8K Free
Swap: 4352M Total, 236K Used, 4352M Free
Swapping doesn't have much to do with low free memory.
There's actually very little swap use, but only 2 pages of free memory.
I think that means that the memory is being used for interrupt
handling, because anything else would allocate from the cache queue
well before that happened.
You might try switching the interface to polling or increasing both of
the free memory watermarks vm.v_free_min and vm.v_free_target.
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