Messages in this thread | | | Date | Thu, 18 Sep 2003 09:08:45 +0200 | From | Jens Axboe <> | Subject | Re: experiences beyond 4 GB RAM with 2.4.22 |
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On Wed, Sep 17 2003, Marcelo Tosatti wrote: > > > On Wed, 17 Sep 2003, Jens Axboe wrote: > > > On Wed, Sep 17 2003, Alan Cox wrote: > > > On Maw, 2003-09-16 at 20:58, Olivier Galibert wrote: > > > > On Tue, Sep 16, 2003 at 04:29:02PM +0100, Alan Cox wrote: > > > > > The kernel has no idea what you will do with given ram. It does try to > > > > > make some guesses but you are basically trying to paper over hardware > > > > > limits. > > > > > > > > Is there a way to specifically turn that ram into a tmpfs though? > > > > > > > > > Something like z2ram copied and hacked a little to kmap the blocks it > > > wants would give you a block device you could use for swap or for /tmp. > > > Im not sure tmpfs would work here > > > > Aditionally, you need GFP_DMA32 or similar. Would also alleviate the > > nasty pressure on ZONE_NORMAL which is often quite stressed. > > IMO such GFP_DMA32 flag is a bit intrusive for 2.4, isnt it?
Not really, it's just an extra zone. Maybe I can dig such a patch up, I had one for 2.4.2-pre something...
> What has been done in 2.6 in respect to the excessive normal zone > pressure and bounce buffering problems?
Nothing, afaic. 2.6 isn't even completely deadlock free when it comes to bounce buffering.
-- Jens Axboe
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