>-----Original Message----- >From: Nix [mailto:n...@esperi.org.uk] >Sent: Monday, January 31, 2011 3:31 PM >To: Allan, Bruce W >Cc: e1000-devel@lists.sourceforge.net >Subject: Re: [E1000-devel] 82754L spontaneous freeze networking woes continue >in >2.6.37 > >On 31 Jan 2011, Bruce W. Allan spake thusly: > >>>From: Nix [mailto:n...@esperi.org.uk] >>>I'm not so sure anymore. In 2.6.35.4, everything works -- but in 2.6.35.4, >>>the lspci output is *exactly the same*, i.e. even there lspci claims that >>>ASPM L0s and L1 are enabled. This seems unlikely, since even if the L0s/L1 >>>state persists across a poweroff, the problem disappears upon a simple >>>reboot into 2.6.35.4, and does not recur in that kernel release. >> >> Which kernel versions? The above mentioned are all the same??? > >Yes. 2.6.35.4..2.6.37 have no differences whatsoever in their lspci output >for my 82574L cards. > >I am... confuzzled, but am happy to try turning L0s/L1 off (if I can >figure out how to do it: setpci is... not the most friendly of tools >and I've never even looked at its manpage before).
ASPM is enabled/disabled via bits 1:0 of byte 16 in the Express Endpoint capability register. First see what is in this byte with the following: # setpci -s [[[[<domain>]:]<bus>]:][<slot>][.[<func>]] CAP_EXP+10.b where [[[[<domain>]:]<bus>]:][<slot>][.[<func>]] is the slot information for your 82574. I'm guessing that command will return 43 (hex) to indicate ASPM L0s (bit 0) and ASPM L1 (bit 1) are both enabled based on your previous lspci output. Now, re-write the byte with bits 1:0 set to 10b (or 42 hex) to disable ASPM L0s: # setpci -s [[[[<domain>]:]<bus>]:][<slot>][.[<func>]] CAP_EXP+10.b=42 or 00b (40 hex) to disable both ASPM L0s and L1: # setpci -s [[[[<domain>]:]<bus>]:][<slot>][.[<func>]] CAP_EXP+10.b=40 and verify with 'lspci -vvv' that ASPM L0s [and L1] are disabled. ------------------------------------------------------------------------------ Special Offer-- Download ArcSight Logger for FREE (a $49 USD value)! Finally, a world-class log management solution at an even better price-free! Download using promo code Free_Logger_4_Dev2Dev. Offer expires February 28th, so secure your free ArcSight Logger TODAY! http://p.sf.net/sfu/arcsight-sfd2d _______________________________________________ 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
