> If I remember correctly, there's still some issues with the L2 cache on > pa8800 that we haven't quite bothered to work out yet, since it's "good > enough" for now. James probably knows more. It would be interesting to > see if you could reproduce it with a UP 64-bit kernel on your C3750 to > discount the L2 problems. Googling, I see Grant had trouble with RCU_TORTURE_TEST=y. Probably, I should test current kernel to see if the problem is still present. I guess you are referring to this change: http://fossplanet.com/linux.debian.devel.kernel.cvs/thread-4378354-r7141-patches/ I'm thinking we must be missing a flush... Maybe in clear_user_page as for copy_user_page? Do the problematic debian buildd machines have pa8800/pa8900 processors? My sense is that some change (probably to the core memory management code) made the coherence issue worse post 2.6.22.x. Dave -- J. David Anglin dave.anglin@xxxxxxxxxxxxxx National Research Council of Canada (613) 990-0752 (FAX: 952-6602) -- To unsubscribe from this list: send the line "unsubscribe linux-parisc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
