Messages in this thread | | | Date | Sun, 03 Nov 2002 09:32:28 -0500 | From | Brian Gerst <> | Subject | Re: Machine's high load when HIGHMEM is enabled |
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vasya vasyaev wrote: > Hello, > > I have some strange kind of problem: > When HIGHMEM-enabled kernel is used, there is too high > CPU load on any task - computer get loaded high while > it is doing some minor, usual jobs (load average grows > significantly).
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.
-- Brian Gerst
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