Luigi Rizzo wrote:
On Sun, Oct 04, 2009 at 06:47:23PM +0500, rihad wrote:
Hi, we have around 500-600 mbit/s traffic flowing through a 7.1R Dell
PowerEdge w/ 2 GigE bce cards. There are currently around 4 thousand ISP
users online limited by dummynet pipes of various speeds. According to
netstat -s output around 500-1000 packets are being dropped every second
(this accounts for wasting around 7-12 mbit/s worth of traffic according
to systat -ifstat):
At those speeds you might be hitting various limits with your
config (e.g. 50k nmbclusters is probably way too small for
4k users -- means you have an average of 10-15 buffers per user;
the queue size of 350kbytes = 2.6Mbits means 2.6 seconds of buffering,
which is quite high besides the fact that in order to scale to 4k users
you would need over 1GB of kernel memory just for the buffers).
top output:
Mem: 2037M Active, 1248M Inact, 450M Wired, 184M Cache, 214M Buf, 17M Free
I guess we're quite far from reaching 1GB of kernel memory.
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