Messages in this thread | | | Date | Tue, 16 Sep 2003 21:53:45 +0200 | From | Olivier Galibert <> | Subject | Re: experiences beyond 4 GB RAM with 2.4.22 |
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On Tue, Sep 16, 2003 at 07:10:57PM +0200, Pavel Machek wrote: > Hi! > > > > Well, I do understand the bounce buffer problem, but honestly the current way > > > of handling the situation seems questionable at least. If you ever tried such a > > > system you notice it is a lot worse than just dumping the additional ram above > > > 4GB. You can really watch your network connections go bogus which is just > > > unacceptable. Is there any thinkable way to ommit the bounce buffers and still > > > do something useful with the beyond-4GB ram parts? > > > > The 2.6 tree is somewhat better about this but at the end of the day if > > your I/O subsystem can't do the job your box will not perform ideally. > > For some workloads its a huge win to have the extra RAM, for others the > > I/O is a real pain. > > If he has trouble logging in, then there's a bug somewhere. > Bounce buffers should not slow machine down more than > 2x, and from his description it looks like way worse slowdown.
The box does not just slowdown, the box crawls on the floor wimpering. Nothing works except ping until the i/os are finished (and they seem to crawl too), then everything works perfectly again.
We're quite eager to fix the problem too, if you want us to test some things.
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