OK. I'll file an internal bug on this. Todd Fujinaka Software Application Engineer Networking Division (ND) Intel Corporation [email protected] (503) 712-4565
-----Original Message----- From: Petr Cervenka [mailto:[email protected]] Sent: Friday, October 11, 2013 6:30 AM To: Fujinaka, Todd Cc: e1000-devel Subject: RE: [E1000-devel] BQL and netconsole Hello. I must apologize, because it is not easy to fill internal buffers of network adapter with unplugged cable. Normal network communication* probably doesn't reach the driver under such circumstances. Netconsole must be bypassing that somehow. (*I tried RAW Ethernet packets.) Petr ______________________________________________________________ > Od: "Petr Cervenka" <[email protected]> > Komu: "Fujinaka, Todd" <[email protected]> > Datum: 08.10.2013 14:33 > Předmět: RE: [E1000-devel] BQL and netconsole > > CC: "e1000-devel" <[email protected]> >Netconsole is only easiest and most visible way to reproduce the issue. >Similar behavior could be produced by sending multiple packets when network is >configured such way. >Every single packet will need 2 seconds to timeout and to make "Reset adapter" >message. > >Without BQL, there is only one 2sec timeout and one "Reset adapter" message > >Petr > >PS: If anything is unclear, just ask me a question. >______________________________________________________________ >> Od: "Fujinaka, Todd" <[email protected]> >> Komu: Petr Cervenka <[email protected]>, "e1000-devel" >> <[email protected]> >> Datum: 20.09.2013 18:14 >> Předmět: RE: [E1000-devel] BQL and netconsole >> >Netconsole is not developed by us, so we can't guarantee interoperability. You >may need to ask the netconsole developers for help. > >Todd Fujinaka >Software Application Engineer >Networking Division (ND) >Intel Corporation >[email protected] >(503) 712-4565 > > >-----Original Message----- >From: Petr Cervenka [mailto:[email protected]] >Sent: Friday, September 20, 2013 2:14 AM >To: Fujinaka, Todd; e1000-devel >Subject: RE: [E1000-devel] BQL and netconsole > >I tried version 2.5.4 with the same result. >I will try to explain the problem shortly: >Network interface and netconsole are configured as I wrote earlier. Network >cable is unplugged. > >Normally (in older versions) all netconsole messages were buffered in the >driver tx queue. >When a watchdog task timed out, all of them were cleared at once, including >the messages produced by the watchdog task itself. > >In newer versions there is always only one netconsole message in the driver tx >queue. The rest is buffered "elsewhere". >When the watchdog task times out, only the driver tx queue is cleared. The >"elsewhere" buffer is untouched. >Meanwhile the watchdog task produces another message to transmit ("Reset >adapter") and that message is stored in "elsewhere" buffer. > >______________________________________________________________ >> Od: "Fujinaka, Todd" <[email protected]> >> Komu: Petr Cervenka <[email protected]>, "e1000-devel" >> <[email protected]> >> Datum: 19.09.2013 19:38 >> Předmět: RE: [E1000-devel] BQL and netconsole >> >>Not really sure what the problem could be, but there is a BQL fix in 2.4.14. >>Have you tried the latest driver on e1000.sourceforge.net? >> >>Todd Fujinaka >>Software Application Engineer >>Networking Division (ND) >>Intel Corporation >>[email protected] >>(503) 712-4565 >> >>-----Original Message----- >>From: Petr Cervenka [mailto:[email protected]] >>Sent: Tuesday, September 17, 2013 12:50 AM >>To: Fujinaka, Todd; e1000-devel >>Subject: RE: [E1000-devel] BQL and netconsole >> >>>Is this on the e1000 driver? Can you tell us which part you're using as well? >> >>Driver is e1000e. Till 1.11.3 it's OK, versions 2.0.0 and later produce the >>problem. >> >>> >>>How are you configuring the link? Are you bringing the link down with ifdown? >> >>Interface is configured with static IP: >>$ ifconfig eth0 10.1.1.2 up >> >>Netconsole is configured as broadcast on that interface: >>$ modprobe netconsole netconsole=@/eth0,@255.255.255.255/ >> >>Link is lost by unplugging of the cable. >> >>Event to start the problem could be plugging in the flash disk or similar >>command to: >>$ echo "<8>kernel message" > /dev/kmsg >> >>Petr >> >>>Hello, >>>I have a problem with usage of netconsole and BQL. >>>If the netconsole is configured to interface without link and any event >>>(with netconsole message) happens, the computer starts to print "Reset >>>adapter" message cca every 2 seconds. >>>It's because driver watchdog task times out and resets the adapter and >>>produces new message for netconsole. >>>Without the BQL, the message is put to tx queue and almost immediatelly >>>cleared in e1000_reinit_locked. >>>But with BQL enabled driver, the messages are queued in some upper layer and >>>are processed one by one with 2 seconds timeout. >>>Is there any workaround or patch to fix such behavior (to clear higher level >>>queue in reinit?) ? >>>Thanks in advance. >> >> >>_______________________________________________ >>>E1000-devel mailing list >>>[email protected] >>>https://lists.sourceforge.net/lists/listinfo/e1000-devel >>><https://lists.sourceforge.net/lists/listinfo/e1000-devel> >>>To learn more about Intel® Ethernet, visit >>>http://communities.intel.com/community/wired >>><http://communities.intel.com/community/wired> >>> >> > > ------------------------------------------------------------------------------ October Webinars: Code for Performance Free Intel webinars can help you accelerate application performance. 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