On 01/11/2017 07:12 PM, Chris Murphy wrote:
I retested Fedora 25 to match the same kernel used by Rawhide, and I get:
[ ID] Interval Transfer Bandwidth
[ 3] 0.0-10.1 sec 49.9 MBytes 41.6 Mbits/sec
Is that consistent on retries? I get really variable results on WiFi.
I'd run the test several times...
# rmmod iwldvm iwlwifi ; modprobe iwlwifi
# iperf -c 10.1.10.4
------------------------------------------------------------
Client connecting to 10.1.10.4, TCP port 5001
TCP window size: 85.0 KByte (default)
------------------------------------------------------------
[ 3] local 10.1.10.94 port 57528 connected with 10.1.10.4 port 5001
[ ID] Interval Transfer Bandwidth
[ 3] 0.0-10.0 sec 17.8 MBytes 14.9 Mbits/sec
...
[ 3] 0.0-10.0 sec 22.1 MBytes 18.5 Mbits/sec
...
[ 3] 0.0-10.0 sec 23.4 MBytes 19.5 Mbits/sec
...
[ 3] 0.0-10.0 sec 23.1 MBytes 19.3 Mbits/sec
...
[ 3] 0.0-10.1 sec 23.0 MBytes 19.2 Mbits/sec
Of course, I get better results with TX aggregation enabled:
# rmmod iwldvm iwlwifi ; modprobe iwlwifi 11n_disable=8
# iperf -c 10.1.10.4
------------------------------------------------------------
Client connecting to 10.1.10.4, TCP port 5001
TCP window size: 85.0 KByte (default)
------------------------------------------------------------
[ 3] local 10.1.10.94 port 57554 connected with 10.1.10.4 port 5001
[ ID] Interval Transfer Bandwidth
[ 3] 0.0-10.1 sec 88.6 MBytes 73.7 Mbits/sec
...
[ 3] 0.0-10.0 sec 88.2 MBytes 74.0 Mbits/sec
Firmware versions are the same in all three cases. And the iw outputs
are all the same. And the laptop is in the same location. So there is
something in the ether affecting the result, but it does seem pretty
clear there's something awry with Fedora 25 and it's not the kernel or
the firmware. Maybe wpa_supplicant? OK this is weird....
If I'm not mistaken, with the rawhide kernel you got better results than
you've posted previously in this thread. I don't think it's entirely
clear that the problem isn't the kernel.
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