Re: HPPA and Squeeze
- To: firstname.lastname@example.org (Kyle McMartin)
- Cc: email@example.com, firstname.lastname@example.org, James.Bottomley@hansenpartnership.com, email@example.com, firstname.lastname@example.org, email@example.com, firstname.lastname@example.org, email@example.com, firstname.lastname@example.org, email@example.com
- Subject: Re: HPPA and Squeeze
- From: "John David Anglin" <firstname.lastname@example.org>
- Date: Mon, 6 Jul 2009 21:47:09 -0400 (EDT)
- Message-id: <20090707014710.EF3975022@hiauly1.hia.nrc.ca>
- In-reply-to: <20090706214315.GA3826@bombadil.infradead.org>
> 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:
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.
J. David Anglin email@example.com
National Research Council of Canada (613) 990-0752 (FAX: 952-6602)