Hi Daneil, I'll attempt to answer your questions:
>> * what does Tx Unit Hang means? We check to make sure transmits are occurring after a set period of time. If during that time a transmit has not occurred and we have transmits pending we set a bit saying we are concerned. This bit will be cleared if we receive a pause frame. If during the next check the same conditions are true and the bit is still set we say we have a TX hang. >> * what is the state of the driver after this kind of messages? After entering this state we should schedule a reset. The idea being that it will restart transmits. Sounds like you are not seeing this. >> * does 'resetting adapter' means that driver tries to recover from >error? Yes, like I mentioned above we will reset the port to try and restart transmits. I'm confused on why your adapter didn't reset. >> * how can I control 'Tx Unit Hang' ?(e.g disable tx hang check, or >> increase the timeout for check). You can't disable it. If transmit is really hung you pretty much need to reset. There is no interface for increasing the timeout and it would be difficult to hack into the driver as Tx hang detection logic is part of the service tasklet. Basically a tasklet that does all our periodic and functions that need to run outside of interrupt contexts. This tasklet gets schedule when any of that work needs to be done. Which leads me to my questions. :) - What driver are you seeing this on. And if not the latest Source Forge driver have you tried that one. - What is the system doing when this event occurs? - Is Pause Frames enabled? - What kernel version (or distro) are you running on? Thanks, Don Skidmore <donald.c.skidm...@intel.com> >-----Original Message----- >From: Daniel Baluta [mailto:daniel.bal...@gmail.com] >Sent: Tuesday, June 07, 2011 6:32 AM >To: e1000-devel@lists.sourceforge.net >Subject: Re: [E1000-devel] ixgbe: Detected Tx Unit Hang > >On Tue, Jun 7, 2011 at 11:16 AM, Daniel Baluta <daniel.bal...@gmail.com> >wrote: >> Hello, >> >> I am using ixgbe driver for an Ethernet 82599EB controller. >> Under high load I see the messages pasted below: >> >> [44403.560/9] ixgbe: eth2: ixgbe_check_tx_hang: Detected Tx Unit Hang >> [44403.560/9] Tx Queue <9> >> [44403.560/9] TDH, TDT <730>, <714> >> [44403.560/9] next_to_use <714> >> [44403.560/9] next_to_clean <72a> >> [44403.583/9] ixgbe: eth2: ixgbe_check_tx_hang: >tx_buffer_info[next_to_clean] >> [44403.583/9] time_stamp <102a28e51> >> [44403.583/9] jiffies <102a29262> >> [44403.598/9] ixgbe: eth2: ixgbe_clean_tx_irq: tx hang 1 detected, >> resetting adapter >> >> >> I am now analyzing the code and I try to understand the following >things: >> * what does Tx Unit Hang means? >> * what is the state of the driver after this kind of messages? >> * does 'resetting adapter' means that driver tries to recover from >error? >> * how can I control 'Tx Unit Hang' ?(e.g disable tx hang check, or >> increase the timeout for check). >> >> Could you help me? >> >> My real problem is that after I see this message, the interface isn't >> able to transmit any other message, even if I bring the interface >down/up. > >OK, after more testing I found out that after bringing down/up the >interface >I can use it again for sending/receiving traffic. > >Anyhow, isn't ixgbe_reset_task which is call on TX hang supposed to >have the same effect as if eth0 down; ifconfig eth0 up? > >thanks, >Daniel. > >------------------------------------------------------------------------ >------ >EditLive Enterprise is the world's most technically advanced content >authoring tool. Experience the power of Track Changes, Inline Image >Editing and ensure content is compliant with Accessibility Checking. >http://p.sf.net/sfu/ephox-dev2dev >_______________________________________________ >E1000-devel mailing list >E1000-devel@lists.sourceforge.net >https://lists.sourceforge.net/lists/listinfo/e1000-devel >To learn more about Intel® Ethernet, visit >http://communities.intel.com/community/wired ------------------------------------------------------------------------------ EditLive Enterprise is the world's most technically advanced content authoring tool. Experience the power of Track Changes, Inline Image Editing and ensure content is compliant with Accessibility Checking. http://p.sf.net/sfu/ephox-dev2dev _______________________________________________ E1000-devel mailing list E1000-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/e1000-devel To learn more about Intel® Ethernet, visit http://communities.intel.com/community/wired
