Hello Felix (reply inline)
On 11/18/2013 07:15 PM, Felix Fietkau wrote: > On 2013-11-20 00:49, cmsv wrote: >> I have not seen this issue but i have another issue in hands which >> forces me to cold reboot some routers. >> It is described here: >> http://www.mail-archive.com/openwrt-devel@lists.openwrt.org/msg20575.html >> >> The causes the ath9k 9**** router to freeze but i do believe that it is >> related to tcp traffic and iptables since i have found a work around to >> prevent the router to freeze. I will post later my conclusions regarding >> this issue. >> >> >> I also noticed another very strange occurrence related to the freezes. >> >> # ls >> % >> 77000 >> 770?????H?H?H?H?H?H?H?H?H?H?H?H????$ >> 9?0000} >> Enter >> Z^B????{[2]+: >> bin >> dev >> etc >> lib >> mnt >> overlay >> proc >> rom >> root >> r?[J??[J????????????[12Du >> r?[J??[J????????????? >> sbin >> sys >> tmp >> usr >> var >> www >> ?^@^@^@^@^@^A[ >> ?^@^@^??????1000] >> ? >> ? >> ?????0?????s >> ?&L?00] ?[ >> ?&L?00] ?[ ` 1w>????????s>? >> ???z >> ?????}????????i???~??kX??^@^@~@^B^@^H!B?^H^H >> ?j?j?j?j?j??????????i??%R? >> >> I have not found out why i get these files in / >> Al this only happens with AR9*** > I'm pretty sure your serial console is picking up garbage input. The > freezes themselves are probably caused by the sysrq magic sequence > appearing in that garbage. A while back I've committed a patch to trunk > that makes it stop processing the sysrq sequence from the serial port. I > have now backported this to AA in r38863. I updated to DISTRIB_REVISION="r38863" which applied target/linux/generic/patches-3.3/890-8250_optional_sysrq.patch and the the freezes only apply now to serial connection which after afew hours i have to reboot the router if i want to connect through serial. (i use a usb to serial converter). The network keeps working and so far i see no issues. I have tested with AR9xxx and AR7xxx. Although this patch seemed to solve the network freeze problem i still get: [ 169.770000] net_ratelimit: 4598 callbacks suppressed [ 1864.610000] net_ratelimit: 6 callbacks suppressed [ 1869.620000] net_ratelimit: 4639 callbacks suppressed [39448.090000] net_ratelimit: 4997 callbacks suppressed [41383.600000] net_ratelimit: 16 callbacks suppressed Adding the following to /etc/sysctl.conf net.ipv4.tcp_max_syn_backlog = 2048 net.ipv4.tcp_synack_retries = 3 eliminates "net_ratelimit callbacks suppressed" messages and it when do bandwidth tests with iperf; i seem to get better results with 5mbit more. > Please test if this resolves > your freezes (although you will probably still get garbage files in /). As for "garbage files" and serial support the only options i have selected when make kernel_config are: <*> 8250/16550 and compatible serial support [*] Console on 8250/16550 and compatible serial port [*] AR933X serial port support [*] Console on AR933X serial port $ cat .config| grep serial # CONFIG_PACKAGE_kmod-serial-8250 is not set # CONFIG_PACKAGE_kmod-usb-serial is not set # CONFIG_PACKAGE_boost-serialization is not set # CONFIG_PACKAGE_serialoverip is not set # CONFIG_PACKAGE_setserial is not set # CONFIG_PACKAGE_mbus-serial is not set # CONFIG_PACKAGE_pyserial is not set Even tho i did not remove this from building the image; i also did not get garbage files so far as before. It does seem that the patch also took care of it. > If you want to make sure that this doesn't happen, build an image with > serial console support disabled - I don't think this is a software bug. I will update my other report regarding my bug conclusions later on. > > - Felix > @ Ben with this revision and patch i get a lot of IBSS-RSN splits and more frequent.
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