Hi again Joseph. Thanks for your guidance through out this process :)
Yes, this bring the speed back close as it were in 12.04. I tested on
both the upstream kernel, and the current Trusty 14.04 kernel. Both are
working at fairly high speeds again (see below).
So I guess this one was not exactly a bug, but a conscious decision to
compromise speed in favor of stability.
Kind Regards.
Upstream kernel
######################################################################
$ uname -a
Linux vanhalen 3.15.0-031500rc5-generic #201405091635 SMP Fri May 9 20:36:31
UTC 2014 x86_64 x86_64 x86_64 GNU/Linux
$ iperf -c reinhardt
------------------------------------------------------------
Client connecting to reinhardt, TCP port 5001
TCP window size: 85.0 KByte (default)
------------------------------------------------------------
[ 3] local 192.168.1.105 port 49994 connected with 192.168.1.1 port 5001
[ ID] Interval Transfer Bandwidth
[ 3] 0.0-10.0 sec 104 MBytes 87.1 Mbits/sec
$ rsync -e "ssh -p2312" -vP LAS.s22e10.432p.mp4 reinhardt:
user@reinhardt's password:
LAS.s22e10.432p.mp4
235,861,112 100% 13.49MB/s 0:00:16 (xfr#1, to-chk=0/1)
sent 235,918,776 bytes received 34 bytes 10,039,098.30 bytes/sec
total size is 235,861,112 speedup is 1.00
Current Trusty kernel
######################################################################
$ uname -a
Linux vanhalen 3.13.0-24-generic #47-Ubuntu SMP Fri May 2 23:30:00 UTC 2014
x86_64 x86_64 x86_64 GNU/Linux
$ iperf -c reinhardt
------------------------------------------------------------
Client connecting to reinhardt, TCP port 5001
TCP window size: 85.0 KByte (default)
------------------------------------------------------------
[ 3] local 192.168.1.105 port 54472 connected with 192.168.1.1 port 5001
[ ID] Interval Transfer Bandwidth
[ 3] 0.0-10.0 sec 132 MBytes 110 Mbits/sec
$ rsync -vP LAS.s22e10.432p.mp4 reinhardt:
user@reinhardt's password:
LAS.s22e10.432p.mp4
235,861,112 100% 12.12MB/s 0:00:18 (xfr#1, to-chk=0/1)
sent 235,918,776 bytes received 34 bytes 8,902,596.60 bytes/sec
total size is 235,861,112 speedup is 1.00
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https://bugs.launchpad.net/bugs/1319630
Title:
85% performance hit in iwlwifi from 12.04 to 14.04
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