Problem found in kernel 2.6.34 and 2.6.35 [e1000-devel, the Intel wired ethernet developers mailing list] [E1000-devel] e1000e latency issues https://sourceforge.net/mailarchive/forum.php?thread_name=8DD2590731AB5D4C9DBF71A877482A900164D9262F%40orsmsx509.amr.corp.intel.com&forum_name=e1000-devel
From: Allan, Bruce W <bruce.al...@in...> - 2010-08-10 02:03 >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. From: Allan, Bruce W <bruce.al...@in...> - 2010-08-10 14:55 >That's great news! Thanks for the confirmation. We'll fix the issue >by forcibly disabling L1 in the driver for that adapter. > >The SourceForge driver and the latest in-kernel driver are very close >to one another (except the SourceForge driver has a compatibility >layer that allows it to run on older kernels). They should work about >the same, but sometimes it might take a little longer for some fixes >to get rolled up into the latest stable kernel(s). I need to get >better at updating the version number in the in-kernel driver. -- To UNSUBSCRIBE, email to debian-bugs-dist-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org
