From: Frank Rowand <frank_rowand@hp.com>
To: parisc-linux@thepuffingroup.com
Subject: Re: [parisc-linux] Progress - Update
Date: Wed, 24 Nov 1999 14:38:49 -0800 [thread overview]
Message-ID: <383C68F9.C8C6792A@hp.com> (raw)
In-Reply-To: 19991124223730.N1009@mathe.stud.uni-erlangen.de
Philipp Rumpf wrote:
>
> >| are you up-to-date with the cvs tree (I have no idea which caches the 735
> >| has, but cache flushes won't harm (well, they do harm performance)) ?
> >
> > The cache flush instructions are architected to cause a processor to memory
> > transfer iff the cache line is dirty, while an instruction is executed,
> > unless a dirty cache line is referenced, memory bandwidth is not consumed.
>
> At the current rate of cache flushes (way way too high), the main factor wrt
> performance is indeed the execution of the instructions.
>
> As soon as we've implemented page colouring (which turns out to be really very
> close to large page support), I expect us to get along with very very few
> cache flushes - basically I hope we can avoid them completely.
>
> Philipp Rumpf
No such luck. You'll need cache flushing in drivers for non-coherent IO.
-Frank
next prev parent reply other threads:[~1999-11-24 22:37 UTC|newest]
Thread overview: 50+ messages / expand[flat|nested] mbox.gz Atom feed top
1999-11-18 23:16 [parisc-linux] Progress John David Anglin
1999-11-19 3:30 ` Philipp Rumpf
1999-11-21 23:07 ` John David Anglin
1999-11-22 1:12 ` John David Anglin
1999-11-22 8:24 ` Philipp Rumpf
1999-11-22 9:59 ` Alan Cox
1999-11-22 15:54 ` Philipp Rumpf
1999-11-22 7:30 ` Philipp Rumpf
1999-11-22 18:11 ` John David Anglin
1999-11-22 18:27 ` Stan Sieler
1999-11-22 18:42 ` Philipp Rumpf
1999-11-22 18:33 ` Philipp Rumpf
1999-11-22 20:55 ` John David Anglin
1999-11-23 11:47 ` Philipp Rumpf
1999-11-23 16:19 ` John David Anglin
1999-11-23 18:03 ` Philipp Rumpf
1999-11-23 19:01 ` John David Anglin
1999-11-23 21:11 ` Stan Sieler
1999-11-24 10:00 ` Philipp Rumpf
1999-11-24 19:00 ` Stan Sieler
1999-11-24 19:33 ` Philipp Rumpf
1999-11-24 20:55 ` [parisc-linux] Progress - Update John David Anglin
1999-11-24 21:05 ` Philipp Rumpf
1999-11-24 21:27 ` Kirk Bresniker
1999-11-24 21:37 ` Philipp Rumpf
1999-11-24 22:38 ` Frank Rowand [this message]
1999-11-24 23:24 ` Cache Flushes Grant Grundler
1999-11-25 0:31 ` [parisc-linux] Progress - Update John David Anglin
1999-11-25 1:17 ` Alan Cox
1999-11-25 13:24 ` Philipp Rumpf
1999-11-25 23:47 ` John David Anglin
1999-11-30 18:17 ` John David Anglin
1999-11-30 18:21 ` Alan Cox
1999-11-30 18:32 ` Philipp Rumpf
1999-11-30 19:31 ` Alan Cox
1999-11-30 20:14 ` Mark Klein
1999-11-30 23:40 ` John David Anglin
1999-12-01 15:41 ` Philipp Rumpf
1999-12-01 18:03 ` Alan Cox
1999-12-01 18:29 ` Alex deVries
1999-12-01 18:34 ` Alan Cox
1999-12-02 2:51 ` Philipp Rumpf
1999-12-01 18:33 ` John David Anglin
1999-12-01 18:54 ` Alan Cox
1999-12-01 18:55 ` Grant Grundler
1999-11-26 13:40 ` Matthew Wilcox
1999-11-23 15:59 ` [parisc-linux] Progress Paul Bame
1999-11-23 16:33 ` John David Anglin
1999-11-23 17:05 ` Paul Bame
1999-11-23 20:15 ` John David Anglin
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