В сообщении от Среда 15 февраля 2012 01:03:46 вы написали:

There are some potentially interesting differences in sysctl values:

quoted

diff -u /tmp/sysctl-a-3.1.txt /tmp/sysctl-a-3.2.txt  | grep mem_def

-net.core.wmem_default = 114688
-net.core.rmem_default = 114688
+net.core.wmem_default = 163840
+net.core.rmem_default = 163840

Can you please try running this as root on the 3.2 kernel and then see
what sort of performance you get:

sysctl net.core.rmem_default=114688

This should make the 3.2 config closer to the 3.1 config. Should be
interesting to see if the behavior is more similar when that happens.

neal

Nothing changed with download speed after I set net.core.wmem_default = 114688 
and net.core.rmem_default = 114688.