W dniu 24.04.2014 08:10, Julian Sikorski pisze: > Dear all, > > I have been moderately recently hit by a performance drop of Intel > Advanced-N 6230 card. I unfortunately do not have the "before" numbers, > but I have noticed this since I was able to stream bluray rips over nfs > to a wired Raspberry Pi a while ago and now I cannot. This has lead me > to begin investigating the issue. > In the end I have used iperf3, testing speeds between RPi and laptop, > with laptop running both Windows and Linux. iperf3 on RPi was always the > same, on the laptop it was self-compiled iperf3 git master (on Windows I > used Cygwin). Please see the observed speeds below: > - Windows: upload to RPi 93 Mbit/s, download from RPi 54 Mbit/s > - Fedora: upload to RPi 26 Mbit/s, download from RPi 48 Mbit/s > > This is all on Fedora 20 x86_64. Please find attached the journalctl log > for the last boot. Please let me know if more information is needed - I > would love to get my network speeds back up to the level where I can > watch bluray rips again. Thank you for your support in advance. > > Best regards, > Julian > Hello again, I have narrowed this down to have regressed between 3.13.6-200.fc20 and 3.13.7-200. Using pointers from Josh Boyer of #fedora-devel, I have managed to restore the previous performance by loading iwlwifi with 11n_disable=8. I am now at 3.14.1-200 with that option enabled and the network is fast as it used to be. Is such a major performance hit expected from this change? Here is the commit in question: https://git.kernel.org/cgit/linux/kernel/git/stable/linux-stable.git/commit/?h=linux-3.13.y&id=45e5cb4f43d33e72ff5f98c80b081eb42e4e4182 Best regards, Julian -- To unsubscribe from this list: send the line "unsubscribe linux-wireless" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
