Messages in this thread | | | Date | Mon, 4 Nov 2002 10:54:35 -0800 (PST) | From | vasya vasyaev <> | Subject | Re: Machine's high load when HIGHMEM is enabled |
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Hello,
First of all - thanks to these people, who responded to my question.
I have some news...
I've tried kernels: 2.4.19 - the same result 2.5.44 - the same result 2.5.45 - the same result
If I take 1 Gb of memory away, then computer works much better, faster (something like without enabled HIGHMEM at all). The same effect takes place if I say mem=1024M while physically box has 2Gb of RAM - everything is fine! But if I start HIGHMEM enabled kernel on this box (2Gb RAM), then it works too slowly...
The questions are: 1. is there anyone on the list, who has the same or near configuration ? (main is that the box has >=2Gb of RAM) 2. do you experience the same problems ? 3. maybe it's not a problem at all?!? I mean maybe linux kernel works this way with such amount of memory and there is no problem with that? 4. the case I've described = http://www.cs.helsinki.fi/linux/linux-kernel/2001-02/0292.html ?
and finally, if this could be solved - please tell, how should I set up the kernel/kernel settings to get appropriate results in performance ?
Thank you.
--- Brian Gerst <bgerst@quark.didntduck.org> wrote: > 2.4 can only do I/O to and from lowmem. This means > highmem pages have > to use bounce buffers in lowmem, and th edata is > copied to/from highmem > which is causing the cpu load. This has been > corrected in 2.5, which > can do I/O to any page the device can DMA from.
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