Messages in this thread |  | | | Date | Sun, 3 Nov 2002 16:00:41 +0100 | | From | Jens Axboe <> | | Subject | Re: Machine's high load when HIGHMEM is enabled |
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On Sun, Nov 03 2002, Brian Gerst wrote: > 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
2.4.19 and below, 2.4.20-pre/rc can dma to/from highmem pages just fine.
> 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.
I seriously doubt this is his problem, sounds like something else. For gzip to be disk bound (and thus bounce bound) you would need a seriously fast cpu. And the ssh problem cannot be explained by bouncing either.
-- Jens Axboe
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