From: Grant Grundler <grundler@dsl2.external.hp.com>
To: Matthew Wilcox <willy@debian.org>
Cc: parisc-linux@lists.parisc-linux.org
Subject: Re: [parisc-linux] O_DIRECT on devices
Date: Mon, 15 Jul 2002 01:42:19 -0600 [thread overview]
Message-ID: <20020715074219.18CD54861@dsl2.external.hp.com> (raw)
In-Reply-To: Message from Matthew Wilcox <willy@debian.org> of "Mon, 15 Jul 2002 03:46:32 BST." <20020715034632.E27706@parcelfarce.linux.theplanet.co.uk>
Matthew Wilcox wrote:
> What you're seeing sounds like bogus cache behaviour.
Randolph and I think most SMP bugs reported (and we seen ourselves)
suggest a D-cache problem.
My theory is virtual addresses are flushed on one CPU but any data
accessed through an aliases on another CPU are not flushed. And then
we end up with an inconsistency.
We've been reading Documentation/cachetlb.txt and trying
to understand what it says about virtually indexed caches.
The other thing is we don't hit the problems with PA8500 - only PA8700.
I'm guessing the aliasing or timing is quite different betweem the two.
Maybe someone else knows more?
grant
next prev parent reply other threads:[~2002-07-15 7:42 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-07-11 8:22 [parisc-linux] O_DIRECT on devices Patrick Caulfield
[not found] ` <3D2D4B4B.4010705@deaprofessionale.it>
2002-07-11 9:35 ` Patrick Caulfield
2002-07-15 2:46 ` Matthew Wilcox
2002-07-15 7:42 ` Grant Grundler [this message]
2002-07-15 11:29 ` Matthew Wilcox
2002-07-15 13:57 ` Patrick Caulfield
2002-07-15 14:10 ` Matthew Wilcox
2002-07-15 14:23 ` Patrick Caulfield
-- strict thread matches above, loose matches on Subject: below --
2002-08-13 13:23 [parisc-linux] HP9000/L2000 + FC60 Fiber Support António Ribeiro
2002-08-13 13:29 ` Matthew Wilcox
2002-08-15 6:01 ` Grant Grundler
2003-07-18 5:27 [parisc-linux] cvs [login aborted]? Joel Soete
2003-07-18 11:21 ` Matthew Wilcox
2003-07-18 14:44 ` bame
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