The fix for this is to add the following to /etc/modprobe.d/iwlwifi.conf
options iwlwifi 11n_disable=8
The problem was caused by the following commit, which disabled TX
aggregation by default on the "old" hardware managed by the iwldvm
driver (including our Intel 6300AGN):
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=205e2210daa975d92ace485a65a31ccc4077fe1a
Looking at the commit and output of "modinfo iwlwifi", passing the value
8 to the 11n_disable parameter forces TX aggregation to be enabled
again.
After some basic testing, this has boosted my (upload) transfer speed
from ~20 Mbps to ~100 Mbps (or equivalently, from ~2.5 MB/s to ~ 12
MB/s).
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https://bugs.launchpad.net/bugs/1270208
Title:
8086:422b [Dell Latitude E6520] linux-image-3.11.0-15-generic appears
to regress connection speed for iwlwifi
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