Hi Nils, So, yes, according to the lspci output, ASPM L1 is enabled. Disabling ASPM config option in the kernel may not necessarily disable it in hardware unfortunately. We made a change to the driver to forcibly disable ASPM (L0s for standard frames and both L0s and L1 for jumbo frames) on the adapter you have - this change went into 2.6.34. We suspect your issue may be due to ASPM L1 which can be confirmed by disabling it by either 1) enabling jumbo frames on the adapter, or 2) forcing ASPM L1 disabled via setpci. If you don't have jumbo frames enabled for your network segment, I recommend trying the latter option as follows (assuming your adapter is still PCI bus/device/number 02:00.0 as indicated in the lspci output you provided earlier): 1) First check the hexadecimal value of the LnkCtl register - # setpci -s 2:0.0 0xf0 2) Disable ASPM (both L0s and L1) by zeroing out bits 0 and 1 in the value returned in the previous step. For example, if it returned 42 (hex 42, that is) - # setpci -s 2:0.0 0xf0=0x40 3) Confirm ASPM is disabled by checking the output from lspci again.
Please let us know if this helps your situation, or if you have additional questions. If this resolves the issue, we will update the driver to forcibly disable L1 too. Thanks, Bruce. -----Original Message----- From: Nils Faerber [mailto:[email protected]] Sent: Monday, August 09, 2010 12:53 PM To: Ronciak, John Cc: [email protected]; Tantilov, Emil S Subject: Re: [E1000-devel] e1000e latency issues Ronciak, John wrote: > After talking about this a bit this morning we truly believe that this is > still an ASPM issue and are looking to get you (Nils) as good way to test our > theory. We'll be getting you something soon. Thank you very much! I really appreciate your support! > Cheers, > John Cheers nils -- kernel concepts GbR Tel: +49-271-771091-12 Sieghuetter Hauptweg 48 D-57072 Siegen Mob: +49-176-21024535 http://www.kernelconcepts.de ------------------------------------------------------------------------------ This SF.net email is sponsored by Make an app they can't live without Enter the BlackBerry Developer Challenge http://p.sf.net/sfu/RIM-dev2dev _______________________________________________ E1000-devel mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/e1000-devel To learn more about Intel® Ethernet, visit http://communities.intel.com/community/wired ------------------------------------------------------------------------------ This SF.net email is sponsored by Make an app they can't live without Enter the BlackBerry Developer Challenge http://p.sf.net/sfu/RIM-dev2dev _______________________________________________ E1000-devel mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/e1000-devel To learn more about Intel® Ethernet, visit http://communities.intel.com/community/wired
